path: root/kernel/futex/core.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Fast Userspace Mutexes (which I call "Futexes!").
 *  (C) Rusty Russell, IBM 2002
 *
 *  Generalized futexes, futex requeueing, misc fixes by Ingo Molnar
 *  (C) Copyright 2003 Red Hat Inc, All Rights Reserved
 *
 *  Removed page pinning, fix privately mapped COW pages and other cleanups
 *  (C) Copyright 2003, 2004 Jamie Lokier
 *
 *  Robust futex support started by Ingo Molnar
 *  (C) Copyright 2006 Red Hat Inc, All Rights Reserved
 *  Thanks to Thomas Gleixner for suggestions, analysis and fixes.
 *
 *  PI-futex support started by Ingo Molnar and Thomas Gleixner
 *  Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
 *  Copyright (C) 2006 Timesys Corp., Thomas Gleixner <tglx@timesys.com>
 *
 *  PRIVATE futexes by Eric Dumazet
 *  Copyright (C) 2007 Eric Dumazet <dada1@cosmosbay.com>
 *
 *  Requeue-PI support by Darren Hart <dvhltc@us.ibm.com>
 *  Copyright (C) IBM Corporation, 2009
 *  Thanks to Thomas Gleixner for conceptual design and careful reviews.
 *
 *  Thanks to Ben LaHaise for yelling "hashed waitqueues" loudly
 *  enough at me, Linus for the original (flawed) idea, Matthew
 *  Kirkwood for proof-of-concept implementation.
 *
 *  "The futexes are also cursed."
 *  "But they come in a choice of three flavours!"
 */
#include <linux/compat.h>
#include <linux/jhash.h>
#include <linux/pagemap.h>
#include <linux/freezer.h>
#include <linux/memblock.h>
#include <linux/fault-inject.h>
#include <linux/slab.h>

#include "futex.h"
#include "../locking/rtmutex_common.h"

/*
 * READ this before attempting to hack on futexes!
 *
 * Basic futex operation and ordering guarantees
 * =============================================
 *
 * The waiter reads the futex value in user space and calls
 * futex_wait(). This function computes the hash bucket and acquires
 * the hash bucket lock. After that it reads the futex user space value
 * again and verifies that the data has not changed. If it has not changed
 * it enqueues itself into the hash bucket, releases the hash bucket lock
 * and schedules.
 *
 * The waker side modifies the user space value of the futex and calls
 * futex_wake(). This function computes the hash bucket and acquires the
 * hash bucket lock. Then it looks for waiters on that futex in the hash
 * bucket and wakes them.
 *
 * In futex wake up scenarios where no tasks are blocked on a futex, taking
 * the hb spinlock can be avoided and simply return. In order for this
 * optimization to work, ordering guarantees must exist so that the waiter
 * being added to the list is acknowledged when the list is concurrently being
 * checked by the waker, avoiding scenarios like the following:
 *
 * CPU 0                               CPU 1
 * val = *futex;
 * sys_futex(WAIT, futex, val);
 *   futex_wait(futex, val);
 *   uval = *futex;
 *                                     *futex = newval;
 *                                     sys_futex(WAKE, futex);
 *                                       futex_wake(futex);
 *                                       if (queue_empty())
 *                                         return;
 *   if (uval == val)
 *      lock(hash_bucket(futex));
 *      queue();
 *     unlock(hash_bucket(futex));
 *     schedule();
 *
 * This would cause the waiter on CPU 0 to wait forever because it
 * missed the transition of the user space value from val to newval
 * and the waker did not find the waiter in the hash bucket queue.
 *
 * The correct serialization ensures that a waiter either observes
 * the changed user space value before blocking or is woken by a
 * concurrent waker:
 *
 * CPU 0                                 CPU 1
 * val = *futex;
 * sys_futex(WAIT, futex, val);
 *   futex_wait(futex, val);
 *
 *   waiters++; (a)
 *   smp_mb(); (A) <-- paired with -.
 *                                  |
 *   lock(hash_bucket(futex));      |
 *                                  |
 *   uval = *futex;                 |
 *                                  |        *futex = newval;
 *                                  |        sys_futex(WAKE, futex);
 *                                  |          futex_wake(futex);
 *                                  |
 *                                  `--------> smp_mb(); (B)
 *   if (uval == val)
 *     queue();
 *     unlock(hash_bucket(futex));
 *     schedule();                         if (waiters)
 *                                           lock(hash_bucket(futex));
 *   else                                    wake_waiters(futex);
 *     waiters--; (b)                        unlock(hash_bucket(futex));
 *
 * Where (A) orders the waiters increment and the futex value read through
 * atomic operations (see futex_hb_waiters_inc) and where (B) orders the write
 * to futex and the waiters read (see futex_hb_waiters_pending()).
 *
 * This yields the following case (where X:=waiters, Y:=futex):
 *
 *	X = Y = 0
 *
 *	w[X]=1		w[Y]=1
 *	MB		MB
 *	r[Y]=y		r[X]=x
 *
 * Which guarantees that x==0 && y==0 is impossible; which translates back into
 * the guarantee that we cannot both miss the futex variable change and the
 * enqueue.
 *
 * Note that a new waiter is accounted for in (a) even when it is possible that
 * the wait call can return error, in which case we backtrack from it in (b).
 * Refer to the comment in futex_q_lock().
 *
 * Similarly, in order to account for waiters being requeued on another
 * address we always increment the waiters for the destination bucket before
 * acquiring the lock. It then decrements them again  after releasing it -
 * the code that actually moves the futex(es) between hash buckets (requeue_futex)
 * will do the additional required waiter count housekeeping. This is done for
 * double_lock_hb() and double_unlock_hb(), respectively.
 */

#ifndef CONFIG_HAVE_FUTEX_CMPXCHG
int  __read_mostly futex_cmpxchg_enabled;
#endif


/*
 * On PREEMPT_RT, the hash bucket lock is a 'sleeping' spinlock with an
 * underlying rtmutex. The task which is about to be requeued could have
 * just woken up (timeout, signal). After the wake up the task has to
 * acquire hash bucket lock, which is held by the requeue code.  As a task
 * can only be blocked on _ONE_ rtmutex at a time, the proxy lock blocking
 * and the hash bucket lock blocking would collide and corrupt state.
 *
 * On !PREEMPT_RT this is not a problem and everything could be serialized
 * on hash bucket lock, but aside of having the benefit of common code,
 * this allows to avoid doing the requeue when the task is already on the
 * way out and taking the hash bucket lock of the original uaddr1 when the
 * requeue has been completed.
 *
 * The following state transitions are valid:
 *
 * On the waiter side:
 *   Q_REQUEUE_PI_NONE		-> Q_REQUEUE_PI_IGNORE
 *   Q_REQUEUE_PI_IN_PROGRESS	-> Q_REQUEUE_PI_WAIT
 *
 * On the requeue side:
 *   Q_REQUEUE_PI_NONE		-> Q_REQUEUE_PI_INPROGRESS
 *   Q_REQUEUE_PI_IN_PROGRESS	-> Q_REQUEUE_PI_DONE/LOCKED
 *   Q_REQUEUE_PI_IN_PROGRESS	-> Q_REQUEUE_PI_NONE (requeue failed)
 *   Q_REQUEUE_PI_WAIT		-> Q_REQUEUE_PI_DONE/LOCKED
 *   Q_REQUEUE_PI_WAIT		-> Q_REQUEUE_PI_IGNORE (requeue failed)
 *
 * The requeue side ignores a waiter with state Q_REQUEUE_PI_IGNORE as this
 * signals that the waiter is already on the way out. It also means that
 * the waiter is still on the 'wait' futex, i.e. uaddr1.
 *
 * The waiter side signals early wakeup to the requeue side either through
 * setting state to Q_REQUEUE_PI_IGNORE or to Q_REQUEUE_PI_WAIT depending
 * on the current state. In case of Q_REQUEUE_PI_IGNORE it can immediately
 * proceed to take the hash bucket lock of uaddr1. If it set state to WAIT,
 * which means the wakeup is interleaving with a requeue in progress it has
 * to wait for the requeue side to change the state. Either to DONE/LOCKED
 * or to IGNORE. DONE/LOCKED means the waiter q is now on the uaddr2 futex
 * and either blocked (DONE) or has acquired it (LOCKED). IGNORE is set by
 * the requeue side when the requeue attempt failed via deadlock detection
 * and therefore the waiter q is still on the uaddr1 futex.
 */
enum {
	Q_REQUEUE_PI_NONE		=  0,
	Q_REQUEUE_PI_IGNORE,
	Q_REQUEUE_PI_IN_PROGRESS,
	Q_REQUEUE_PI_WAIT,
	Q_REQUEUE_PI_DONE,
	Q_REQUEUE_PI_LOCKED,
};

const struct futex_q futex_q_init = {
	/* list gets initialized in futex_queue()*/
	.key		= FUTEX_KEY_INIT,
	.bitset		= FUTEX_BITSET_MATCH_ANY,
	.requeue_state	= ATOMIC_INIT(Q_REQUEUE_PI_NONE),
};

/*
 * The base of the bucket array and its size are always used together
 * (after initialization only in futex_hash()), so ensure that they
 * reside in the same cacheline.
 */
static struct {
	struct futex_hash_bucket *queues;
	unsigned long            hashsize;
} __futex_data __read_mostly __aligned(2*sizeof(long));
#define futex_queues   (__futex_data.queues)
#define futex_hashsize (__futex_data.hashsize)


/*
 * Fault injections for futexes.
 */
#ifdef CONFIG_FAIL_FUTEX

static struct {
	struct fault_attr attr;

	bool ignore_private;
} fail_futex = {
	.attr = FAULT_ATTR_INITIALIZER,
	.ignore_private = false,
};

static int __init setup_fail_futex(char *str)
{
	return setup_fault_attr(&fail_futex.attr, str);
}
__setup("fail_futex=", setup_fail_futex);

bool should_fail_futex(bool fshared)
{
	if (fail_futex.ignore_private && !fshared)
		return false;

	return should_fail(&fail_futex.attr, 1);
}

#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS

static int __init fail_futex_debugfs(void)
{
	umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
	struct dentry *dir;

	dir = fault_create_debugfs_attr("fail_futex", NULL,
					&fail_futex.attr);
	if (IS_ERR(dir))
		return PTR_ERR(dir);

	debugfs_create_bool("ignore-private", mode, dir,
			    &fail_futex.ignore_private);
	return 0;
}

late_initcall(fail_futex_debugfs);

#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */

#endif /* CONFIG_FAIL_FUTEX */

/*
 * Reflects a new waiter being added to the waitqueue.
 */
static inline void futex_hb_waiters_inc(struct futex_hash_bucket *hb)
{
#ifdef CONFIG_SMP
	atomic_inc(&hb->waiters);
	/*
	 * Full barrier (A), see the ordering comment above.
	 */
	smp_mb__after_atomic();
#endif
}

/*
 * Reflects a waiter being removed from the waitqueue by wakeup
 * paths.
 */
static inline void futex_hb_waiters_dec(struct futex_hash_bucket *hb)
{
#ifdef CONFIG_SMP
	atomic_dec(&hb->waiters);
#endif
}

static inline int futex_hb_waiters_pending(struct futex_hash_bucket *hb)
{
#ifdef CONFIG_SMP
	/*
	 * Full barrier (B), see the ordering comment above.
	 */
	smp_mb();
	return atomic_read(&hb->waiters);
#else
	return 1;
#endif
}

/**
 * futex_hash - Return the hash bucket in the global hash
 * @key:	Pointer to the futex key for which the hash is calculated
 *
 * We hash on the keys returned from get_futex_key (see below) and return the
 * corresponding hash bucket in the global hash.
 */
struct futex_hash_bucket *futex_hash(union futex_key *key)
{
	u32 hash = jhash2((u32 *)key, offsetof(typeof(*key), both.offset) / 4,
			  key->both.offset);

	return &futex_queues[hash & (futex_hashsize - 1)];
}


/**
 * futex_match - Check whether two futex keys are equal
 * @key1:	Pointer to key1
 * @key2:	Pointer to key2
 *
 * Return 1 if two futex_keys are equal, 0 otherwise.
 */
static inline int futex_match(union futex_key *key1, union futex_key *key2)
{
	return (key1 && key2
		&& key1->both.word == key2->both.word
		&& key1->both.ptr == key2->both.ptr
		&& key1->both.offset == key2->both.offset);
}

/**
 * futex_setup_timer - set up the sleeping hrtimer.
 * @time:	ptr to the given timeout value
 * @timeout:	the hrtimer_sleeper structure to be set up
 * @flags:	futex flags
 * @range_ns:	optional range in ns
 *
 * Return: Initialized hrtimer_sleeper structure or NULL if no timeout
 *	   value given
 */
struct hrtimer_sleeper *
futex_setup_timer(ktime_t *time, struct hrtimer_sleeper *timeout,
		  int flags, u64 range_ns)
{
	if (!time)
		return NULL;

	hrtimer_init_sleeper_on_stack(timeout, (flags & FLAGS_CLOCKRT) ?
				      CLOCK_REALTIME : CLOCK_MONOTONIC,
				      HRTIMER_MODE_ABS);
	/*
	 * If range_ns is 0, calling hrtimer_set_expires_range_ns() is
	 * effectively the same as calling hrtimer_set_expires().
	 */
	hrtimer_set_expires_range_ns(&timeout->timer, *time, range_ns);

	return timeout;
}

/*
 * Generate a machine wide unique identifier for this inode.
 *
 * This relies on u64 not wrapping in the life-time of the machine; which with
 * 1ns resolution means almost 585 years.
 *
 * This further relies on the fact that a well formed program will not unmap
 * the file while it has a (shared) futex waiting on it. This mapping will have
 * a file reference which pins the mount and inode.
 *
 * If for some reason an inode gets evicted and read back in again, it will get
 * a new sequence number and will _NOT_ match, even though it is the exact same
 * file.
 *
 * It is important that futex_match() will never have a false-positive, esp.
 * for PI futexes that can mess up the state. The above argues that false-negatives
 * are only possible for malformed programs.
 */
static u64 get_inode_sequence_number(struct inode *inode)
{
	static atomic64_t i_seq;
	u64 old;

	/* Does the inode already have a sequence number? */
	old = atomic64_read(&inode->i_sequence);
	if (likely(old))
		return old;

	for (;;) {
		u64 new = atomic64_add_return(1, &i_seq);
		if (WARN_ON_ONCE(!new))
			continue;

		old = atomic64_cmpxchg_relaxed(&inode->i_sequence, 0, new);
		if (old)
			return old;
		return new;
	}
}

/**
 * get_futex_key() - Get parameters which are the keys for a futex
 * @uaddr:	virtual address of the futex
 * @fshared:	false for a PROCESS_PRIVATE futex, true for PROCESS_SHARED
 * @key:	address where result is stored.
 * @rw:		mapping needs to be read/write (values: FUTEX_READ,
 *              FUTEX_WRITE)
 *
 * Return: a negative error code or 0
 *
 * The key words are stored in @key on success.
 *
 * For shared mappings (when @fshared), the key is:
 *
 *   ( inode->i_sequence, page->index, offset_within_page )
 *
 * [ also see get_inode_sequence_number() ]
 *
 * For private mappings (or when !@fshared), the key is:
 *
 *   ( current->mm, address, 0 )
 *
 * This allows (cross process, where applicable) identification of the futex
 * without keeping the page pinned for the duration of the FUTEX_WAIT.
 *
 * lock_page() might sleep, the caller should not hold a spinlock.
 */
int get_futex_key(u32 __user *uaddr, bool fshared, union futex_key *key,
		  enum futex_access rw)
{
	unsigned long address = (unsigned long)uaddr;
	struct mm_struct *mm = current->mm;
	struct page *page, *tail;
	struct address_space *mapping;
	int err, ro = 0;

	/*
	 * The futex address must be "naturally" aligned.
	 */
	key->both.offset = address % PAGE_SIZE;
	if (unlikely((address % sizeof(u32)) != 0))
		return -EINVAL;
	address -= key->both.offset;

	if (unlikely(!access_ok(uaddr, sizeof(u32))))
		return -EFAULT;

	if (unlikely(should_fail_futex(fshared)))
		return -EFAULT;

	/*
	 * PROCESS_PRIVATE futexes are fast.
	 * As the mm cannot disappear under us and the 'key' only needs
	 * virtual address, we dont even have to find the underlying vma.
	 * Note : We do have to check 'uaddr' is a valid user address,
	 *        but access_ok() should be faster than find_vma()
	 */
	if (!fshared) {
		key->private.mm = mm;
		key->private.address = address;
		return 0;
	}

again:
	/* Ignore any VERIFY_READ mapping (futex common case) */
	if (unlikely(should_fail_futex(true)))
		return -EFAULT;

	err = get_user_pages_fast(address, 1, FOLL_WRITE, &page);
	/*
	 * If write access is not required (eg. FUTEX_WAIT), try
	 * and get read-only access.
	 */
	if (err == -EFAULT && rw == FUTEX_READ) {
		err = get_user_pages_fast(address, 1, 0, &page);
		ro = 1;
	}
	if (err < 0)
		return err;
	else
		err = 0;

	/*
	 * The treatment of mapping from this point on is critical. The page
	 * lock protects many things but in this context the page lock
	 * stabilizes mapping, prevents inode freeing in the shared
	 * file-backed region case and guards against movement to swap cache.
	 *
	 * Strictly speaking the page lock is not needed in all cases being
	 * considered here and page lock forces unnecessarily serialization
	 * From this point on, mapping will be re-verified if necessary and
	 * page lock will be acquired only if it is unavoidable
	 *
	 * Mapping checks require the head page for any compound page so the
	 * head page and mapping is looked up now. For anonymous pages, it
	 * does not matter if the page splits in the future as the key is
	 * based on the address. For filesystem-backed pages, the tail is
	 * required as the index of the page determines the key. For
	 * base pages, there is no tail page and tail == page.
	 */
	tail = page;
	page = compound_head(page);
	mapping = READ_ONCE(page->mapping);

	/*
	 * If page->mapping is NULL, then it cannot be a PageAnon
	 * page; but it might be the ZERO_PAGE or in the gate area or
	 * in a special mapping (all cases which we are happy to fail);
	 * or it may have been a good file page when get_user_pages_fast
	 * found it, but truncated or holepunched or subjected to
	 * invalidate_complete_page2 before we got the page lock (also
	 * cases which we are happy to fail).  And we hold a reference,
	 * so refcount care in invalidate_complete_page's remove_mapping
	 * prevents drop_caches from setting mapping to NULL beneath us.
	 *
	 * The case we do have to guard against is when memory pressure made
	 * shmem_writepage move it from filecache to swapcache beneath us:
	 * an unlikely race, but we do need to retry for page->mapping.
	 */
	if (unlikely(!mapping)) {
		int shmem_swizzled;

		/*
		 * Page lock is required to identify which special case above
		 * applies. If this is really a shmem page then the page lock
		 * will prevent unexpected transitions.
		 */
		lock_page(page);
		shmem_swizzled = PageSwapCache(page) || page->mapping;
		unlock_page(page);
		put_page(page);

		if (shmem_swizzled)
			goto again;

		return -EFAULT;
	}

	/*
	 * Private mappings are handled in a simple way.
	 *
	 * If the futex key is stored on an anonymous page, then the associated
	 * object is the mm which is implicitly pinned by the calling process.
	 *
	 * NOTE: When userspace waits on a MAP_SHARED mapping, even if
	 * it's a read-only handle, it's expected that futexes attach to
	 * the object not the particular process.
	 */
	if (PageAnon(page)) {
		/*
		 * A RO anonymous page will never change and thus doesn't make
		 * sense for futex operations.
		 */
		if (unlikely(should_fail_futex(true)) || ro) {
			err = -EFAULT;
			goto out;
		}

		key->both.offset |= FUT_OFF_MMSHARED; /* ref taken on mm */
		key->private.mm = mm;
		key->private.address = address;

	} else {
		struct inode *inode;

		/*
		 * The associated futex object in this case is the inode and
		 * the page->mapping must be traversed. Ordinarily this should
		 * be stabilised under page lock but it's not strictly
		 * necessary in this case as we just want to pin the inode, not
		 * update the radix tree or anything like that.
		 *
		 * The RCU read lock is taken as the inode is finally freed
		 * under RCU. If the mapping still matches expectations then the
		 * mapping->host can be safely accessed as being a valid inode.
		 */
		rcu_read_lock();

		if (READ_ONCE(page->mapping) != mapping) {
			rcu_read_unlock();
			put_page(page);

			goto again;
		}

		inode = READ_ONCE(mapping->host);
		if (!inode) {
			rcu_read_unlock();
			put_page(page);

			goto again;
		}

		key->both.offset |= FUT_OFF_INODE; /* inode-based key */
		key->shared.i_seq = get_inode_sequence_number(inode);
		key->shared.pgoff = page_to_pgoff(tail);
		rcu_read_unlock();
	}

out:
	put_page(page);
	return err;
}

/**
 * fault_in_user_writeable() - Fault in user address and verify RW access
 * @uaddr:	pointer to faulting user space address
 *
 * Slow path to fixup the fault we just took in the atomic write
 * access to @uaddr.
 *
 * We have no generic implementation of a non-destructive write to the
 * user address. We know that we faulted in the atomic pagefault
 * disabled section so we can as well avoid the #PF overhead by
 * calling get_user_pages() right away.
 */
int fault_in_user_writeable(u32 __user *uaddr)
{
	struct mm_struct *mm = current->mm;
	int ret;

	mmap_read_lock(mm);
	ret = fixup_user_fault(mm, (unsigned long)uaddr,
			       FAULT_FLAG_WRITE, NULL);
	mmap_read_unlock(mm);

	return ret < 0 ? ret : 0;
}

/**
 * futex_top_waiter() - Return the highest priority waiter on a futex
 * @hb:		the hash bucket the futex_q's reside in
 * @key:	the futex key (to distinguish it from other futex futex_q's)
 *
 * Must be called with the hb lock held.
 */
struct futex_q *futex_top_waiter(struct futex_hash_bucket *hb, union futex_key *key)
{
	struct futex_q *this;

	plist_for_each_entry(this, &hb->chain, list) {
		if (futex_match(&this->key, key))
			return this;
	}
	return NULL;
}

int futex_cmpxchg_value_locked(u32 *curval, u32 __user *uaddr, u32 uval, u32 newval)
{
	int ret;

	pagefault_disable();
	ret = futex_atomic_cmpxchg_inatomic(curval, uaddr, uval, newval);
	pagefault_enable();

	return ret;
}

int futex_get_value_locked(u32 *dest, u32 __user *from)
{
	int ret;

	pagefault_disable();
	ret = __get_user(*dest, from);
	pagefault_enable();

	return ret ? -EFAULT : 0;
}

/**
 * wait_for_owner_exiting - Block until the owner has exited
 * @ret: owner's current futex lock status
 * @exiting:	Pointer to the exiting task
 *
 * Caller must hold a refcount on @exiting.
 */
void wait_for_owner_exiting(int ret, struct task_struct *exiting)
{
	if (ret != -EBUSY) {
		WARN_ON_ONCE(exiting);
		return;
	}

	if (WARN_ON_ONCE(ret == -EBUSY && !exiting))
		return;

	mutex_lock(&exiting->futex_exit_mutex);
	/*
	 * No point in doing state checking here. If the waiter got here
	 * while the task was in exec()->exec_futex_release() then it can
	 * have any FUTEX_STATE_* value when the waiter has acquired the
	 * mutex. OK, if running, EXITING or DEAD if it reached exit()
	 * already. Highly unlikely and not a problem. Just one more round
	 * through the futex maze.
	 */
	mutex_unlock(&exiting->futex_exit_mutex);

	put_task_struct(exiting);
}

/**
 * __futex_unqueue() - Remove the futex_q from its futex_hash_bucket
 * @q:	The futex_q to unqueue
 *
 * The q->lock_ptr must not be NULL and must be held by the caller.
 */
static void __futex_unqueue(struct futex_q *q)
{
	struct futex_hash_bucket *hb;

	if (WARN_ON_SMP(!q->lock_ptr) || WARN_ON(plist_node_empty(&q->list)))
		return;
	lockdep_assert_held(q->lock_ptr);

	hb = container_of(q->lock_ptr, struct futex_hash_bucket, lock);
	plist_del(&q->list, &hb->chain);
	futex_hb_waiters_dec(hb);
}

/*
 * The hash bucket lock must be held when this is called.
 * Afterwards, the futex_q must not be accessed. Callers
 * must ensure to later call wake_up_q() for the actual
 * wakeups to occur.
 */
static void futex_wake_mark(struct wake_q_head *wake_q, struct futex_q *q)
{
	struct task_struct *p = q->task;

	if (WARN(q->pi_state || q->rt_waiter, "refusing to wake PI futex\n"))
		return;

	get_task_struct(p);
	__futex_unqueue(q);
	/*
	 * The waiting task can free the futex_q as soon as q->lock_ptr = NULL
	 * is written, without taking any locks. This is possible in the event
	 * of a spurious wakeup, for example. A memory barrier is required here
	 * to prevent the following store to lock_ptr from getting ahead of the
	 * plist_del in __futex_unqueue().
	 */
	smp_store_release(&q->lock_ptr, NULL);

	/*
	 * Queue the task for later wakeup for after we've released
	 * the hb->lock.
	 */
	wake_q_add_safe(wake_q, p);
}

/*
 * Express the locking dependencies for lockdep:
 */
static inline void
double_lock_hb(struct futex_hash_bucket *hb1, struct futex_hash_bucket *hb2)
{
	if (hb1 <= hb2) {
		spin_lock(&hb1->lock);
		if (hb1 < hb2)
			spin_lock_nested(&hb2->lock, SINGLE_DEPTH_NESTING);
	} else { /* hb1 > hb2 */
		spin_lock(&hb2->lock);
		spin_lock_nested(&hb1->lock, SINGLE_DEPTH_NESTING);
	}
}

static inline void
double_unlock_hb(struct futex_hash_bucket *hb1, struct futex_hash_bucket *hb2)
{
	spin_unlock(&hb1->lock);
	if (hb1 != hb2)
		spin_unlock(&hb2->lock);
}

/*
 * Wake up waiters matching bitset queued on this futex (uaddr).
 */
int futex_wake(u32 __user *uaddr, unsigned int flags, int nr_wake, u32 bitset)
{
	struct futex_hash_bucket *hb;
	struct futex_q *this, *next;
	union futex_key key = FUTEX_KEY_INIT;
	int ret;
	DEFINE_WAKE_Q(wake_q);

	if (!bitset)
		return -EINVAL;

	ret = get_futex_key(uaddr, flags & FLAGS_SHARED, &key, FUTEX_READ);
	if (unlikely(ret != 0))
		return ret;

	hb = futex_hash(&key);

	/* Make sure we really have tasks to wakeup */
	if (!futex_hb_waiters_pending(hb))
		return ret;

	spin_lock(&hb->lock);

	plist_for_each_entry_safe(this, next, &hb->chain, list) {
		if (futex_match (&this->key, &key)) {
			if (this->pi_state || this->rt_waiter) {
				ret = -EINVAL;
				break;
			}

			/* Check if one of the bits is set in both bitsets */
			if (!(this->bitset & bitset))
				continue;

			futex_wake_mark(&wake_q, this);
			if (++ret >= nr_wake)
				break;
		}
	}

	spin_unlock(&hb->lock);
	wake_up_q(&wake_q);
	return ret;
}

static int futex_atomic_op_inuser(unsigned int encoded_op, u32 __user *uaddr)
{
	unsigned int op =	  (encoded_op & 0x70000000) >> 28;
	unsigned int cmp =	  (encoded_op & 0x0f000000) >> 24;
	int oparg = sign_extend32((encoded_op & 0x00fff000) >> 12, 11);
	int cmparg = sign_extend32(encoded_op & 0x00000fff, 11);
	int oldval, ret;

	if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) {
		if (oparg < 0 || oparg > 31) {
			char comm[sizeof(current->comm)];
			/*
			 * kill this print and return -EINVAL when userspace
			 * is sane again
			 */
			pr_info_ratelimited("futex_wake_op: %s tries to shift op by %d; fix this program\n",
					get_task_comm(comm, current), oparg);
			oparg &= 31;
		}
		oparg = 1 << oparg;
	}

	pagefault_disable();
	ret = arch_futex_atomic_op_inuser(op, oparg, &oldval, uaddr);
	pagefault_enable();
	if (ret)
		return ret;

	switch (cmp) {
	case FUTEX_OP_CMP_EQ:
		return oldval == cmparg;
	case FUTEX_OP_CMP_NE:
		return oldval != cmparg;
	case FUTEX_OP_CMP_LT:
		return oldval < cmparg;
	case FUTEX_OP_CMP_GE:
		return oldval >= cmparg;
	case FUTEX_OP_CMP_LE:
		return oldval <= cmparg;
	case FUTEX_OP_CMP_GT:
		return oldval > cmparg;
	default:
		return -ENOSYS;
	}
}

/*
 * Wake up all waiters hashed on the physical page that is mapped
 * to this virtual address:
 */
int futex_wake_op(u32 __user *uaddr1, unsigned int flags, u32 __user *uaddr2,
		  int nr_wake, int nr_wake2, int op)
{
	union futex_key key1 = FUTEX_KEY_INIT, key2 = FUTEX_KEY_INIT;
	struct futex_hash_bucket *hb1, *hb2;
	struct futex_q *this, *next;
	int ret, op_ret;
	DEFINE_WAKE_Q(wake_q);

retry:
	ret = get_futex_key(uaddr1, flags & FLAGS_SHARED, &key1, FUTEX_READ);
	if (unlikely(ret != 0))
		return ret;
	ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2, FUTEX_WRITE);
	if (unlikely(ret != 0))
		return ret;

	hb1 = futex_hash(&key1);
	hb2 = futex_hash(&key2);

retry_private:
	double_lock_hb(hb1, hb2);
	op_ret = futex_atomic_op_inuser(op, uaddr2);
	if (unlikely(op_ret < 0)) {
		double_unlock_hb(hb1, hb2);

		if (!IS_ENABLED(CONFIG_MMU) ||
		    unlikely(op_ret != -EFAULT && op_ret != -EAGAIN)) {
			/*
			 * we don't get EFAULT from MMU faults if we don't have
			 * an MMU, but we might get them from range checking
			 */
			ret = op_ret;
			return ret;
		}

		if (op_ret == -EFAULT) {
			ret = fault_in_user_writeable(uaddr2);
			if (ret)
				return ret;
		}

		cond_resched();
		if (!(flags & FLAGS_SHARED))
			goto retry_private;
		goto retry;
	}

	plist_for_each_entry_safe(this, next, &hb1->chain, list) {
		if (futex_match (&this->key, &key1)) {
			if (this->pi_state || this->rt_waiter) {
				ret = -EINVAL;
				goto out_unlock;
			}
			futex_wake_mark(&wake_q, this);
			if (++ret >= nr_wake)
				break;
		}
	}

	if (op_ret > 0) {
		op_ret = 0;
		plist_for_each_entry_safe(this, next, &hb2->chain, list) {
			if (futex_match (&this->key, &key2)) {
				if (this->pi_state || this->rt_waiter) {
					ret = -EINVAL;
					goto out_unlock;
				}
				futex_wake_mark(&wake_q, this);
				if (++op_ret >= nr_wake2)
					break;
			}
		}
		ret += op_ret;
	}

out_unlock:
	double_unlock_hb(hb1, hb2);
	wake_up_q(&wake_q);
	return ret;
}

/**
 * requeue_futex() - Requeue a futex_q from one hb to another
 * @q:		the futex_q to requeue
 * @hb1:	the source hash_bucket
 * @hb2:	the target hash_bucket
 * @key2:	the new key for the requeued futex_q
 */
static inline
void requeue_futex(struct futex_q *q, struct futex_hash_bucket *hb1,
		   struct futex_hash_bucket *hb2, union futex_key *key2)
{

	/*
	 * If key1 and key2 hash to the same bucket, no need to
	 * requeue.
	 */
	if (likely(&hb1->chain != &hb2->chain)) {
		plist_del(&q->list, &hb1->chain);
		futex_hb_waiters_dec(hb1);
		futex_hb_waiters_inc(hb2);
		plist_add(&q->list, &hb2->chain);
		q->lock_ptr = &hb2->lock;
	}
	q->key = *key2;
}

static inline bool futex_requeue_pi_prepare(struct futex_q *q,
					    struct futex_pi_state *pi_state)
{
	int old, new;

	/*
	 * Set state to Q_REQUEUE_PI_IN_PROGRESS unless an early wakeup has
	 * already set Q_REQUEUE_PI_IGNORE to signal that requeue should
	 * ignore the waiter.
	 */
	old = atomic_read_acquire(&q->requeue_state);
	do {
		if (old == Q_REQUEUE_PI_IGNORE)
			return false;

		/*
		 * futex_proxy_trylock_atomic() might have set it to
		 * IN_PROGRESS and a interleaved early wake to WAIT.
		 *
		 * It was considered to have an extra state for that
		 * trylock, but that would just add more conditionals
		 * all over the place for a dubious value.
		 */
		if (old != Q_REQUEUE_PI_NONE)
			break;

		new = Q_REQUEUE_PI_IN_PROGRESS;
	} while (!atomic_try_cmpxchg(&q->requeue_state, &old, new));

	q->pi_state = pi_state;
	return true;
}

static inline void futex_requeue_pi_complete(struct futex_q *q, int locked)
{
	int old, new;

	old = atomic_read_acquire(&q->requeue_state);
	do {
		if (old == Q_REQUEUE_PI_IGNORE)
			return;

		if (locked >= 0) {
			/* Requeue succeeded. Set DONE or LOCKED */
			WARN_ON_ONCE(old != Q_REQUEUE_PI_IN_PROGRESS &&
				     old != Q_REQUEUE_PI_WAIT);
			new = Q_REQUEUE_PI_DONE + locked;
		} else if (old == Q_REQUEUE_PI_IN_PROGRESS) {
			/* Deadlock, no early wakeup interleave */
			new = Q_REQUEUE_PI_NONE;
		} else {
			/* Deadlock, early wakeup interleave. */
			WARN_ON_ONCE(old != Q_REQUEUE_PI_WAIT);
			new = Q_REQUEUE_PI_IGNORE;
		}
	} while (!atomic_try_cmpxchg(&q->requeue_state, &old, new));

#ifdef CONFIG_PREEMPT_RT
	/* If the waiter interleaved with the requeue let it know */
	if (unlikely(old == Q_REQUEUE_PI_WAIT))
		rcuwait_wake_up(&q->requeue_wait);
#endif
}

static inline int futex_requeue_pi_wakeup_sync(struct futex_q *q)
{
	int old, new;

	old = atomic_read_acquire(&q->requeue_state);
	do {
		/* Is requeue done already? */
		if (old >= Q_REQUEUE_PI_DONE)
			return old;

		/*
		 * If not done, then tell the requeue code to either ignore
		 * the waiter or to wake it up once the requeue is done.
		 */
		new = Q_REQUEUE_PI_WAIT;
		if (old == Q_REQUEUE_PI_NONE)
			new = Q_REQUEUE_PI_IGNORE;
	} while (!atomic_try_cmpxchg(&q->requeue_state, &old, new));

	/* If the requeue was in progress, wait for it to complete */
	if (old == Q_REQUEUE_PI_IN_PROGRESS) {
#ifdef CONFIG_PREEMPT_RT
		rcuwait_wait_event(&q->requeue_wait,
				   atomic_read(&q->requeue_state) != Q_REQUEUE_PI_WAIT,
				   TASK_UNINTERRUPTIBLE);
#else
		(void)atomic_cond_read_relaxed(&q->requeue_state, VAL != Q_REQUEUE_PI_WAIT);
#endif
	}

	/*
	 * Requeue is now either prohibited or complete. Reread state
	 * because during the wait above it might have changed. Nothing
	 * will modify q->requeue_state after this point.
	 */
	return atomic_read(&q->requeue_state);
}

/**
 * requeue_pi_wake_futex() - Wake a task that acquired the lock during requeue
 * @q:		the futex_q
 * @key:	the key of the requeue target futex
 * @hb:		the hash_bucket of the requeue target futex
 *
 * During futex_requeue, with requeue_pi=1, it is possible to acquire the
 * target futex if it is uncontended or via a lock steal.
 *
 * 1) Set @q::key to the requeue target futex key so the waiter can detect
 *    the wakeup on the right futex.
 *
 * 2) Dequeue @q from the hash bucket.
 *
 * 3) Set @q::rt_waiter to NULL so the woken up task can detect atomic lock
 *    acquisition.
 *
 * 4) Set the q->lock_ptr to the requeue target hb->lock for the case that
 *    the waiter has to fixup the pi state.
 *
 * 5) Complete the requeue state so the waiter can make progress. After
 *    this point the waiter task can return from the syscall immediately in
 *    case that the pi state does not have to be fixed up.
 *
 * 6) Wake the waiter task.
 *
 * Must be called with both q->lock_ptr and hb->lock held.
 */
static inline
void requeue_pi_wake_futex(struct futex_q *q, union futex_key *key,
			   struct futex_hash_bucket *hb)
{
	q->key = *key;

	__futex_unqueue(q);

	WARN_ON(!q->rt_waiter);
	q->rt_waiter = NULL;

	q->lock_ptr = &hb->lock;

	/* Signal locked state to the waiter */
	futex_requeue_pi_complete(q, 1);
	wake_up_state(q->task, TASK_NORMAL);
}

/**
 * futex_proxy_trylock_atomic() - Attempt an atomic lock for the top waiter
 * @pifutex:		the user address of the to futex
 * @hb1:		the from futex hash bucket, must be locked by the caller
 * @hb2:		the to futex hash bucket, must be locked by the caller
 * @key1:		the from futex key
 * @key2:		the to futex key
 * @ps:			address to store the pi_state pointer
 * @exiting:		Pointer to store the task pointer of the owner task
 *			which is in the middle of exiting
 * @set_waiters:	force setting the FUTEX_WAITERS bit (1) or not (0)
 *
 * Try and get the lock on behalf of the top waiter if we can do it atomically.
 * Wake the top waiter if we succeed.  If the caller specified set_waiters,
 * then direct futex_lock_pi_atomic() to force setting the FUTEX_WAITERS bit.
 * hb1 and hb2 must be held by the caller.
 *
 * @exiting is only set when the return value is -EBUSY. If so, this holds
 * a refcount on the exiting task on return and the caller needs to drop it
 * after waiting for the exit to complete.
 *
 * Return:
 *  -  0 - failed to acquire the lock atomically;
 *  - >0 - acquired the lock, return value is vpid of the top_waiter
 *  - <0 - error
 */
static int
futex_proxy_trylock_atomic(u32 __user *pifutex, struct futex_hash_bucket *hb1,
			   struct futex_hash_bucket *hb2, union futex_key *key1,
			   union futex_key *key2, struct futex_pi_state **ps,
			   struct task_struct **exiting, int set_waiters)
{
	struct futex_q *top_waiter = NULL;
	u32 curval;
	int ret;

	if (futex_get_value_locked(&curval, pifutex))
		return -EFAULT;

	if (unlikely(should_fail_futex(true)))
		return -EFAULT;

	/*
	 * Find the top_waiter and determine if there are additional waiters.
	 * If the caller intends to requeue more than 1 waiter to pifutex,
	 * force futex_lock_pi_atomic() to set the FUTEX_WAITERS bit now,
	 * as we have means to handle the possible fault.  If not, don't set
	 * the bit unnecessarily as it will force the subsequent unlock to enter
	 * the kernel.
	 */
	top_waiter = futex_top_waiter(hb1, key1);

	/* There are no waiters, nothing for us to do. */
	if (!top_waiter)
		return 0;

	/*
	 * Ensure that this is a waiter sitting in futex_wait_requeue_pi()
	 * and waiting on the 'waitqueue' futex which is always !PI.
	 */
	if (!top_waiter->rt_waiter || top_waiter->pi_state)
		return -EINVAL;

	/* Ensure we requeue to the expected futex. */
	if (!futex_match(top_waiter->requeue_pi_key, key2))
		return -EINVAL;

	/* Ensure that this does not race against an early wakeup */
	if (!futex_requeue_pi_prepare(top_waiter, NULL))
		return -EAGAIN;

	/*
	 * Try to take the lock for top_waiter and set the FUTEX_WAITERS bit
	 * in the contended case or if @set_waiters is true.
	 *
	 * In the contended case PI state is attached to the lock owner. If
	 * the user space lock can be acquired then PI state is attached to
	 * the new owner (@top_waiter->task) when @set_waiters is true.
	 */
	ret = futex_lock_pi_atomic(pifutex, hb2, key2, ps, top_waiter->task,
				   exiting, set_waiters);
	if (ret == 1) {
		/*
		 * Lock was acquired in user space and PI state was
		 * attached to @top_waiter->task. That means state is fully
		 * consistent and the waiter can return to user space
		 * immediately after the wakeup.
		 */
		requeue_pi_wake_futex(top_waiter, key2, hb2);
	} else if (ret < 0) {
		/* Rewind top_waiter::requeue_state */
		futex_requeue_pi_complete(top_waiter, ret);
	} else {
		/*
		 * futex_lock_pi_atomic() did not acquire the user space
		 * futex, but managed to establish the proxy lock and pi
		 * state. top_waiter::requeue_state cannot be fixed up here
		 * because the waiter is not enqueued on the rtmutex
		 * yet. This is handled at the callsite depending on the
		 * result of rt_mutex_start_proxy_lock() which is
		 * guaranteed to be reached with this function returning 0.
		 */
	}
	return ret;
}

/**
 * futex_requeue() - Requeue waiters from uaddr1 to uaddr2
 * @uaddr1:	source futex user address
 * @flags:	futex flags (FLAGS_SHARED, etc.)
 * @uaddr2:	target futex user address
 * @nr_wake:	number of waiters to wake (must be 1 for requeue_pi)
 * @nr_requeue:	number of waiters to requeue (0-INT_MAX)
 * @cmpval:	@uaddr1 expected value (or %NULL)
 * @requeue_pi:	if we are attempting to requeue from a non-pi futex to a
 *		pi futex (pi to pi requeue is not supported)
 *
 * Requeue waiters on uaddr1 to uaddr2. In the requeue_pi case, try to acquire
 * uaddr2 atomically on behalf of the top waiter.
 *
 * Return:
 *  - >=0 - on success, the number of tasks requeued or woken;
 *  -  <0 - on error
 */
int futex_requeue(u32 __user *uaddr1, unsigned int flags, u32 __user *uaddr2,
		  int nr_wake, int nr_requeue, u32 *cmpval, int requeue_pi)
{
	union futex_key key1 = FUTEX_KEY_INIT, key2 = FUTEX_KEY_INIT;
	int task_count = 0, ret;
	struct futex_pi_state *pi_state = NULL;
	struct futex_hash_bucket *hb1, *hb2;
	struct futex_q *this, *next;
	DEFINE_WAKE_Q(wake_q);

	if (nr_wake < 0 || nr_requeue < 0)
		return -EINVAL;

	/*
	 * When PI not supported: return -ENOSYS if requeue_pi is true,
	 * consequently the compiler knows requeue_pi is always false past
	 * this point which will optimize away all the conditional code
	 * further down.
	 */
	if (!IS_ENABLED(CONFIG_FUTEX_PI) && requeue_pi)
		return -ENOSYS;

	if (requeue_pi) {
		/*
		 * Requeue PI only works on two distinct uaddrs. This
		 * check is only valid for private futexes. See below.
		 */
		if (uaddr1 == uaddr2)
			return -EINVAL;

		/*
		 * futex_requeue() allows the caller to define the number
		 * of waiters to wake up via the @nr_wake argument. With
		 * REQUEUE_PI, waking up more than one waiter is creating
		 * more problems than it solves. Waking up a waiter makes
		 * only sense if the PI futex @uaddr2 is uncontended as
		 * this allows the requeue code to acquire the futex
		 * @uaddr2 before waking the waiter. The waiter can then
		 * return to user space without further action. A secondary
		 * wakeup would just make the futex_wait_requeue_pi()
		 * handling more complex, because that code would have to
		 * look up pi_state and do more or less all the handling
		 * which the requeue code has to do for the to be requeued
		 * waiters. So restrict the number of waiters to wake to
		 * one, and only wake it up when the PI futex is
		 * uncontended. Otherwise requeue it and let the unlock of
		 * the PI futex handle the wakeup.
		 *
		 * All REQUEUE_PI users, e.g. pthread_cond_signal() and
		 * pthread_cond_broadcast() must use nr_wake=1.
		 */
		if (nr_wake != 1)
			return -EINVAL;

		/*
		 * requeue_pi requires a pi_state, try to allocate it now
		 * without any locks in case it fails.
		 */
		if (refill_pi_state_cache())
			return -ENOMEM;
	}

retry:
	ret = get_futex_key(uaddr1, flags & FLAGS_SHARED, &key1, FUTEX_READ);
	if (unlikely(ret != 0))
		return ret;
	ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2,
			    requeue_pi ? FUTEX_WRITE : FUTEX_READ);
	if (unlikely(ret != 0))
		return ret;

	/*
	 * The check above which compares uaddrs is not sufficient for
	 * shared futexes. We need to compare the keys:
	 */
	if (requeue_pi && futex_match(&key1, &key2))
		return -EINVAL;

	hb1 = futex_hash(&key1);
	hb2 = futex_hash(&key2);

retry_private:
	futex_hb_waiters_inc(hb2);
	double_lock_hb(hb1, hb2);

	if (likely(cmpval != NULL)) {
		u32 curval;

		ret = futex_get_value_locked(&curval, uaddr1);

		if (unlikely(ret)) {
			double_unlock_hb(hb1, hb2);
			futex_hb_waiters_dec(hb2);

			ret = get_user(curval, uaddr1);
			if (ret)
				return ret;

			if (!(flags & FLAGS_SHARED))
				goto retry_private;

			goto retry;
		}
		if (curval != *cmpval) {
			ret = -EAGAIN;
			goto out_unlock;
		}
	}

	if (requeue_pi) {
		struct task_struct *exiting = NULL;

		/*
		 * Attempt to acquire uaddr2 and wake the top waiter. If we
		 * intend to requeue waiters, force setting the FUTEX_WAITERS
		 * bit.  We force this here where we are able to easily handle
		 * faults rather in the requeue loop below.
		 *
		 * Updates topwaiter::requeue_state if a top waiter exists.
		 */
		ret = futex_proxy_trylock_atomic(uaddr2, hb1, hb2, &key1,
						 &key2, &pi_state,
						 &exiting, nr_requeue);

		/*
		 * At this point the top_waiter has either taken uaddr2 or
		 * is waiting on it. In both cases pi_state has been
		 * established and an initial refcount on it. In case of an
		 * error there's nothing.
		 *
		 * The top waiter's requeue_state is up to date:
		 *
		 *  - If the lock was acquired atomically (ret == 1), then
		 *    the state is Q_REQUEUE_PI_LOCKED.
		 *
		 *    The top waiter has been dequeued and woken up and can
		 *    return to user space immediately. The kernel/user
		 *    space state is consistent. In case that there must be
		 *    more waiters requeued the WAITERS bit in the user
		 *    space futex is set so the top waiter task has to go
		 *    into the syscall slowpath to unlock the futex. This
		 *    will block until this requeue operation has been
		 *    completed and the hash bucket locks have been
		 *    dropped.
		 *
		 *  - If the trylock failed with an error (ret < 0) then
		 *    the state is either Q_REQUEUE_PI_NONE, i.e. "nothing
		 *    happened", or Q_REQUEUE_PI_IGNORE when there was an
		 *    interleaved early wakeup.
		 *
		 *  - If the trylock did not succeed (ret == 0) then the
		 *    state is either Q_REQUEUE_PI_IN_PROGRESS or
		 *    Q_REQUEUE_PI_WAIT if an early wakeup interleaved.
		 *    This will be cleaned up in the loop below, which
		 *    cannot fail because futex_proxy_trylock_atomic() did
		 *    the same sanity checks for requeue_pi as the loop
		 *    below does.
		 */
		switch (ret) {
		case 0:
			/* We hold a reference on the pi state. */
			break;

		case 1:
			/*
			 * futex_proxy_trylock_atomic() acquired the user space
			 * futex. Adjust task_count.
			 */
			task_count++;
			ret = 0;
			break;

		/*
		 * If the above failed, then pi_state is NULL and
		 * waiter::requeue_state is correct.
		 */
		case -EFAULT:
			double_unlock_hb(hb1, hb2);
			futex_hb_waiters_dec(hb2);
			ret = fault_in_user_writeable(uaddr2);
			if (!ret)
				goto retry;
			return ret;
		case -EBUSY:
		case -EAGAIN:
			/*
			 * Two reasons for this:
			 * - EBUSY: Owner is exiting and we just wait for the
			 *   exit to complete.
			 * - EAGAIN: The user space value changed.
			 */
			double_unlock_hb(hb1, hb2);
			futex_hb_waiters_dec(hb2);
			/*
			 * Handle the case where the owner is in the middle of
			 * exiting. Wait for the exit to complete otherwise
			 * this task might loop forever, aka. live lock.
			 */
			wait_for_owner_exiting(ret, exiting);
			cond_resched();
			goto retry;
		default:
			goto out_unlock;
		}
	}

	plist_for_each_entry_safe(this, next, &hb1->chain, list) {
		if (task_count - nr_wake >= nr_requeue)
			break;

		if (!futex_match(&this->key, &key1))
			continue;

		/*
		 * FUTEX_WAIT_REQUEUE_PI and FUTEX_CMP_REQUEUE_PI should always
		 * be paired with each other and no other futex ops.
		 *
		 * We should never be requeueing a futex_q with a pi_state,
		 * which is awaiting a futex_unlock_pi().
		 */
		if ((requeue_pi && !this->rt_waiter) ||
		    (!requeue_pi && this->rt_waiter) ||
		    this->pi_state) {
			ret = -EINVAL;
			break;
		}

		/* Plain futexes just wake or requeue and are done */
		if (!requeue_pi) {
			if (++task_count <= nr_wake)
				futex_wake_mark(&wake_q, this);
			else
				requeue_futex(this, hb1, hb2, &key2);
			continue;
		}

		/* Ensure we requeue to the expected futex for requeue_pi. */
		if (!futex_match(this->requeue_pi_key, &key2)) {
			ret = -EINVAL;
			break;
		}

		/*
		 * Requeue nr_requeue waiters and possibly one more in the case
		 * of requeue_pi if we couldn't acquire the lock atomically.
		 *
		 * Prepare the waiter to take the rt_mutex. Take a refcount
		 * on the pi_state and store the pointer in the futex_q
		 * object of the waiter.
		 */
		get_pi_state(pi_state);

		/* Don't requeue when the waiter is already on the way out. */
		if (!futex_requeue_pi_prepare(this, pi_state)) {
			/*
			 * Early woken waiter signaled that it is on the
			 * way out. Drop the pi_state reference and try the
			 * next waiter. @this->pi_state is still NULL.
			 */
			put_pi_state(pi_state);
			continue;
		}

		ret = rt_mutex_start_proxy_lock(&pi_state->pi_mutex,
						this->rt_waiter,
						this->task);

		if (ret == 1) {
			/*
			 * We got the lock. We do neither drop the refcount
			 * on pi_state nor clear this->pi_state because the
			 * waiter needs the pi_state for cleaning up the
			 * user space value. It will drop the refcount
			 * after doing so. this::requeue_state is updated
			 * in the wakeup as well.
			 */
			requeue_pi_wake_futex(this, &key2, hb2);
			task_count++;
		} else if (!ret) {
			/* Waiter is queued, move it to hb2 */
			requeue_futex(this, hb1, hb2, &key2);
			futex_requeue_pi_complete(this, 0);
			task_count++;
		} else {
			/*
			 * rt_mutex_start_proxy_lock() detected a potential
			 * deadlock when we tried to queue that waiter.
			 * Drop the pi_state reference which we took above
			 * and remove the pointer to the state from the
			 * waiters futex_q object.
			 */
			this->pi_state = NULL;
			put_pi_state(pi_state);
			futex_requeue_pi_complete(this, ret);
			/*
			 * We stop queueing more waiters and let user space
			 * deal with the mess.
			 */
			break;
		}
	}

	/*
	 * We took an extra initial reference to the pi_state in
	 * futex_proxy_trylock_atomic(). We need to drop it here again.
	 */
	put_pi_state(pi_state);

out_unlock:
	double_unlock_hb(hb1, hb2);
	wake_up_q(&wake_q);
	futex_hb_waiters_dec(hb2);
	return ret ? ret : task_count;
}

/* The key must be already stored in q->key. */
struct futex_hash_bucket *futex_q_lock(struct futex_q *q)
	__acquires(&hb->lock)
{
	struct futex_hash_bucket *hb;

	hb = futex_hash(&q->key);

	/*
	 * Increment the counter before taking the lock so that
	 * a potential waker won't miss a to-be-slept task that is
	 * waiting for the spinlock. This is safe as all futex_q_lock()
	 * users end up calling futex_queue(). Similarly, for housekeeping,
	 * decrement the counter at futex_q_unlock() when some error has
	 * occurred and we don't end up adding the task to the list.
	 */
	futex_hb_waiters_inc(hb); /* implies smp_mb(); (A) */

	q->lock_ptr = &hb->lock;

	spin_lock(&hb->lock);
	return hb;
}

void futex_q_unlock(struct futex_hash_bucket *hb)
	__releases(&hb->lock)
{
	spin_unlock(&hb->lock);
	futex_hb_waiters_dec(hb);
}

void __futex_queue(struct futex_q *q, struct futex_hash_bucket *hb)
{
	int prio;

	/*
	 * The priority used to register this element is
	 * - either the real thread-priority for the real-time threads
	 * (i.e. threads with a priority lower than MAX_RT_PRIO)
	 * - or MAX_RT_PRIO for non-RT threads.
	 * Thus, all RT-threads are woken first in priority order, and
	 * the others are woken last, in FIFO order.
	 */
	prio = min(current->normal_prio, MAX_RT_PRIO);

	plist_node_init(&q->list, prio);
	plist_add(&q->list, &hb->chain);
	q->task = current;
}

/**
 * futex_queue() - Enqueue the futex_q on the futex_hash_bucket
 * @q:	The futex_q to enqueue
 * @hb:	The destination hash bucket
 *
 * The hb->lock must be held by the caller, and is released here. A call to
 * futex_queue() is typically paired with exactly one call to futex_unqueue().  The
 * exceptions involve the PI related operations, which may use futex_unqueue_pi()
 * or nothing if the unqueue is done as part of the wake process and the unqueue
 * state is implicit in the state of woken task (see futex_wait_requeue_pi() for
 * an example).
 */
static inline void futex_queue(struct futex_q *q, struct futex_hash_bucket *hb)
	__releases(&hb->lock)
{
	__futex_queue(q, hb);
	spin_unlock(&hb->lock);
}

/**
 * futex_unqueue() - Remove the futex_q from its futex_hash_bucket
 * @q:	The futex_q to unqueue
 *
 * The q->lock_ptr must not be held by the caller. A call to futex_unqueue() must
 * be paired with exactly one earlier call to futex_queue().
 *
 * Return:
 *  - 1 - if the futex_q was still queued (and we removed unqueued it);
 *  - 0 - if the futex_q was already removed by the waking thread
 */
static int futex_unqueue(struct futex_q *q)
{
	spinlock_t *lock_ptr;
	int ret = 0;

	/* In the common case we don't take the spinlock, which is nice. */
retry:
	/*
	 * q->lock_ptr can change between this read and the following spin_lock.
	 * Use READ_ONCE to forbid the compiler from reloading q->lock_ptr and
	 * optimizing lock_ptr out of the logic below.
	 */
	lock_ptr = READ_ONCE(q->lock_ptr);
	if (lock_ptr != NULL) {
		spin_lock(lock_ptr);
		/*
		 * q->lock_ptr can change between reading it and
		 * spin_lock(), causing us to take the wrong lock.  This
		 * corrects the race condition.
		 *
		 * Reasoning goes like this: if we have the wrong lock,
		 * q->lock_ptr must have changed (maybe several times)
		 * between reading it and the spin_lock().  It can
		 * change again after the spin_lock() but only if it was
		 * already changed before the spin_lock().  It cannot,
		 * however, change back to the original value.  Therefore
		 * we can detect whether we acquired the correct lock.
		 */
		if (unlikely(lock_ptr != q->lock_ptr)) {
			spin_unlock(lock_ptr);
			goto retry;
		}
		__futex_unqueue(q);

		BUG_ON(q->pi_state);

		spin_unlock(lock_ptr);
		ret = 1;
	}

	return ret;
}

/*
 * PI futexes can not be requeued and must remove themselves from the
 * hash bucket. The hash bucket lock (i.e. lock_ptr) is held.
 */
void futex_unqueue_pi(struct futex_q *q)
{
	__futex_unqueue(q);

	BUG_ON(!q->pi_state);
	put_pi_state(q->pi_state);
	q->pi_state = NULL;
}

static long futex_wait_restart(struct restart_block *restart);

/**
 * futex_wait_queue() - futex_queue() and wait for wakeup, timeout, or signal
 * @hb:		the futex hash bucket, must be locked by the caller
 * @q:		the futex_q to queue up on
 * @timeout:	the prepared hrtimer_sleeper, or null for no timeout
 */
static void futex_wait_queue(struct futex_hash_bucket *hb, struct futex_q *q,
				struct hrtimer_sleeper *timeout)
{
	/*
	 * The task state is guaranteed to be set before another task can
	 * wake it. set_current_state() is implemented using smp_store_mb() and
	 * futex_queue() calls spin_unlock() upon completion, both serializing
	 * access to the hash list and forcing another memory barrier.
	 */
	set_current_state(TASK_INTERRUPTIBLE);
	futex_queue(q, hb);

	/* Arm the timer */
	if (timeout)
		hrtimer_sleeper_start_expires(timeout, HRTIMER_MODE_ABS);

	/*
	 * If we have been removed from the hash list, then another task
	 * has tried to wake us, and we can skip the call to schedule().
	 */
	if (likely(!plist_node_empty(&q->list))) {
		/*
		 * If the timer has already expired, current will already be
		 * flagged for rescheduling. Only call schedule if there
		 * is no timeout, or if it has yet to expire.
		 */
		if (!timeout || timeout->task)
			freezable_schedule();
	}
	__set_current_state(TASK_RUNNING);
}

/**
 * futex_wait_setup() - Prepare to wait on a futex
 * @uaddr:	the futex userspace address
 * @val:	the expected value
 * @flags:	futex flags (FLAGS_SHARED, etc.)
 * @q:		the associated futex_q
 * @hb:		storage for hash_bucket pointer to be returned to caller
 *
 * Setup the futex_q and locate the hash_bucket.  Get the futex value and
 * compare it with the expected value.  Handle atomic faults internally.
 * Return with the hb lock held on success, and unlocked on failure.
 *
 * Return:
 *  -  0 - uaddr contains val and hb has been locked;
 *  - <1 - -EFAULT or -EWOULDBLOCK (uaddr does not contain val) and hb is unlocked
 */
static int futex_wait_setup(u32 __user *uaddr, u32 val, unsigned int flags,
			   struct futex_q *q, struct futex_hash_bucket **hb)
{
	u32 uval;
	int ret;

	/*
	 * Access the page AFTER the hash-bucket is locked.
	 * Order is important:
	 *
	 *   Userspace waiter: val = var; if (cond(val)) futex_wait(&var, val);
	 *   Userspace waker:  if (cond(var)) { var = new; futex_wake(&var); }
	 *
	 * The basic logical guarantee of a futex is that it blocks ONLY
	 * if cond(var) is known to be true at the time of blocking, for
	 * any cond.  If we locked the hash-bucket after testing *uaddr, that
	 * would open a race condition where we could block indefinitely with
	 * cond(var) false, which would violate the guarantee.
	 *
	 * On the other hand, we insert q and release the hash-bucket only
	 * after testing *uaddr.  This guarantees that futex_wait() will NOT
	 * absorb a wakeup if *uaddr does not match the desired values
	 * while the syscall executes.
	 */
retry:
	ret = get_futex_key(uaddr, flags & FLAGS_SHARED, &q->key, FUTEX_READ);
	if (unlikely(ret != 0))
		return ret;

retry_private:
	*hb = futex_q_lock(q);

	ret = futex_get_value_locked(&uval, uaddr);

	if (ret) {
		futex_q_unlock(*hb);

		ret = get_user(uval, uaddr);
		if (ret)
			return ret;

		if (!(flags & FLAGS_SHARED))
			goto retry_private;

		goto retry;
	}

	if (uval != val) {
		futex_q_unlock(*hb);
		ret = -EWOULDBLOCK;
	}

	return ret;
}

int futex_wait(u32 __user *uaddr, unsigned int flags, u32 val, ktime_t *abs_time, u32 bitset)
{
	struct hrtimer_sleeper timeout, *to;
	struct restart_block *restart;
	struct futex_hash_bucket *hb;
	struct futex_q q = futex_q_init;
	int ret;

	if (!bitset)
		return -EINVAL;
	q.bitset = bitset;

	to = futex_setup_timer(abs_time, &timeout, flags,
			       current->timer_slack_ns);
retry:
	/*
	 * Prepare to wait on uaddr. On success, it holds hb->lock and q
	 * is initialized.
	 */
	ret = futex_wait_setup(uaddr, val, flags, &q, &hb);
	if (ret)
		goto out;

	/* futex_queue and wait for wakeup, timeout, or a signal. */
	futex_wait_queue(hb, &q, to);

	/* If we were woken (and unqueued), we succeeded, whatever. */
	ret = 0;
	if (!futex_unqueue(&q))
		goto out;
	ret = -ETIMEDOUT;
	if (to && !to->task)
		goto out;

	/*
	 * We expect signal_pending(current), but we might be the
	 * victim of a spurious wakeup as well.
	 */
	if (!signal_pending(current))
		goto retry;

	ret = -ERESTARTSYS;
	if (!abs_time)
		goto out;

	restart = &current->restart_block;
	restart->futex.uaddr = uaddr;
	restart->futex.val = val;
	restart->futex.time = *abs_time;
	restart->futex.bitset = bitset;
	restart->futex.flags = flags | FLAGS_HAS_TIMEOUT;

	ret = set_restart_fn(restart, futex_wait_restart);

out:
	if (to) {
		hrtimer_cancel(&to->timer);
		destroy_hrtimer_on_stack(&to->timer);
	}
	return ret;
}


static long futex_wait_restart(struct restart_block *restart)
{
	u32 __user *uaddr = restart->futex.uaddr;
	ktime_t t, *tp = NULL;

	if (restart->futex.flags & FLAGS_HAS_TIMEOUT) {
		t = restart->futex.time;
		tp = &t;
	}
	restart->fn = do_no_restart_syscall;

	return (long)futex_wait(uaddr, restart->futex.flags,
				restart->futex.val, tp, restart->futex.bitset);
}


/**
 * handle_early_requeue_pi_wakeup() - Handle early wakeup on the initial futex
 * @hb:		the hash_bucket futex_q was original enqueued on
 * @q:		the futex_q woken while waiting to be requeued
 * @timeout:	the timeout associated with the wait (NULL if none)
 *
 * Determine the cause for the early wakeup.
 *
 * Return:
 *  -EWOULDBLOCK or -ETIMEDOUT or -ERESTARTNOINTR
 */
static inline
int handle_early_requeue_pi_wakeup(struct futex_hash_bucket *hb,
				   struct futex_q *q,
				   struct hrtimer_sleeper *timeout)
{
	int ret;

	/*
	 * With the hb lock held, we avoid races while we process the wakeup.
	 * We only need to hold hb (and not hb2) to ensure atomicity as the
	 * wakeup code can't change q.key from uaddr to uaddr2 if we hold hb.
	 * It can't be requeued from uaddr2 to something else since we don't
	 * support a PI aware source futex for requeue.
	 */
	WARN_ON_ONCE(&hb->lock != q->lock_ptr);

	/*
	 * We were woken prior to requeue by a timeout or a signal.
	 * Unqueue the futex_q and determine which it was.
	 */
	plist_del(&q->list, &hb->chain);
	futex_hb_waiters_dec(hb);

	/* Handle spurious wakeups gracefully */
	ret = -EWOULDBLOCK;
	if (timeout && !timeout->task)
		ret = -ETIMEDOUT;
	else if (signal_pending(current))
		ret = -ERESTARTNOINTR;
	return ret;
}

/**
 * futex_wait_requeue_pi() - Wait on uaddr and take uaddr2
 * @uaddr:	the futex we initially wait on (non-pi)
 * @flags:	futex flags (FLAGS_SHARED, FLAGS_CLOCKRT, etc.), they must be
 *		the same type, no requeueing from private to shared, etc.
 * @val:	the expected value of uaddr
 * @abs_time:	absolute timeout
 * @bitset:	32 bit wakeup bitset set by userspace, defaults to all
 * @uaddr2:	the pi futex we will take prior to returning to user-space
 *
 * The caller will wait on uaddr and will be requeued by futex_requeue() to
 * uaddr2 which must be PI aware and unique from uaddr.  Normal wakeup will wake
 * on uaddr2 and complete the acquisition of the rt_mutex prior to returning to
 * userspace.  This ensures the rt_mutex maintains an owner when it has waiters;
 * without one, the pi logic would not know which task to boost/deboost, if
 * there was a need to.
 *
 * We call schedule in futex_wait_queue() when we enqueue and return there
 * via the following--
 * 1) wakeup on uaddr2 after an atomic lock acquisition by futex_requeue()
 * 2) wakeup on uaddr2 after a requeue
 * 3) signal
 * 4) timeout
 *
 * If 3, cleanup and return -ERESTARTNOINTR.
 *
 * If 2, we may then block on trying to take the rt_mutex and return via:
 * 5) successful lock
 * 6) signal
 * 7) timeout
 * 8) other lock acquisition failure
 *
 * If 6, return -EWOULDBLOCK (restarting the syscall would do the same).
 *
 * If 4 or 7, we cleanup and return with -ETIMEDOUT.
 *
 * Return:
 *  -  0 - On success;
 *  - <0 - On error
 */
int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags,
			  u32 val, ktime_t *abs_time, u32 bitset,
			  u32 __user *uaddr2)
{
	struct hrtimer_sleeper timeout, *to;
	struct rt_mutex_waiter rt_waiter;
	struct futex_hash_bucket *hb;
	union futex_key key2 = FUTEX_KEY_INIT;
	struct futex_q q = futex_q_init;
	struct rt_mutex_base *pi_mutex;
	int res, ret;

	if (!IS_ENABLED(CONFIG_FUTEX_PI))
		return -ENOSYS;

	if (uaddr == uaddr2)
		return -EINVAL;

	if (!bitset)
		return -EINVAL;

	to = futex_setup_timer(abs_time, &timeout, flags,
			       current->timer_slack_ns);

	/*
	 * The waiter is allocated on our stack, manipulated by the requeue
	 * code while we sleep on uaddr.
	 */
	rt_mutex_init_waiter(&rt_waiter);

	ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2, FUTEX_WRITE);
	if (unlikely(ret != 0))
		goto out;

	q.bitset = bitset;
	q.rt_waiter = &rt_waiter;
	q.requeue_pi_key = &key2;

	/*
	 * Prepare to wait on uaddr. On success, it holds hb->lock and q
	 * is initialized.
	 */
	ret = futex_wait_setup(uaddr, val, flags, &q, &hb);
	if (ret)
		goto out;

	/*
	 * The check above which compares uaddrs is not sufficient for
	 * shared futexes. We need to compare the keys:
	 */
	if (futex_match(&q.key, &key2)) {
		futex_q_unlock(hb);
		ret = -EINVAL;
		goto out;
	}

	/* Queue the futex_q, drop the hb lock, wait for wakeup. */
	futex_wait_queue(hb, &q, to);

	switch (futex_requeue_pi_wakeup_sync(&q)) {
	case Q_REQUEUE_PI_IGNORE:
		/* The waiter is still on uaddr1 */
		spin_lock(&hb->lock);
		ret = handle_early_requeue_pi_wakeup(hb, &q, to);
		spin_unlock(&hb->lock);
		break;

	case Q_REQUEUE_PI_LOCKED:
		/* The requeue acquired the lock */
		if (q.pi_state && (q.pi_state->owner != current)) {
			spin_lock(q.lock_ptr);
			ret = fixup_pi_owner(uaddr2, &q, true);
			/*
			 * Drop the reference to the pi state which the
			 * requeue_pi() code acquired for us.
			 */
			put_pi_state(q.pi_state);
			spin_unlock(q.lock_ptr);
			/*
			 * Adjust the return value. It's either -EFAULT or
			 * success (1) but the caller expects 0 for success.
			 */
			ret = ret < 0 ? ret : 0;
		}
		break;

	case Q_REQUEUE_PI_DONE:
		/* Requeue completed. Current is 'pi_blocked_on' the rtmutex */
		pi_mutex = &q.pi_state->pi_mutex;
		ret = rt_mutex_wait_proxy_lock(pi_mutex, to, &rt_waiter);

		/* Current is not longer pi_blocked_on */
		spin_lock(q.lock_ptr);
		if (ret && !rt_mutex_cleanup_proxy_lock(pi_mutex, &rt_waiter))
			ret = 0;

		debug_rt_mutex_free_waiter(&rt_waiter);
		/*
		 * Fixup the pi_state owner and possibly acquire the lock if we
		 * haven't already.
		 */
		res = fixup_pi_owner(uaddr2, &q, !ret);
		/*
		 * If fixup_pi_owner() returned an error, propagate that.  If it
		 * acquired the lock, clear -ETIMEDOUT or -EINTR.
		 */
		if (res)
			ret = (res < 0) ? res : 0;

		futex_unqueue_pi(&q);
		spin_unlock(q.lock_ptr);

		if (ret == -EINTR) {
			/*
			 * We've already been requeued, but cannot restart
			 * by calling futex_lock_pi() directly. We could
			 * restart this syscall, but it would detect that
			 * the user space "val" changed and return
			 * -EWOULDBLOCK.  Save the overhead of the restart
			 * and return -EWOULDBLOCK directly.
			 */
			ret = -EWOULDBLOCK;
		}
		break;
	default:
		BUG();
	}

out:
	if (to) {
		hrtimer_cancel(&to->timer);
		destroy_hrtimer_on_stack(&to->timer);
	}
	return ret;
}

/* Constants for the pending_op argument of handle_futex_death */
#define HANDLE_DEATH_PENDING	true
#define HANDLE_DEATH_LIST	false

/*
 * Process a futex-list entry, check whether it's owned by the
 * dying task, and do notification if so:
 */
static int handle_futex_death(u32 __user *uaddr, struct task_struct *curr,
			      bool pi, bool pending_op)
{
	u32 uval, nval, mval;
	int err;

	/* Futex address must be 32bit aligned */
	if ((((unsigned long)uaddr) % sizeof(*uaddr)) != 0)
		return -1;

retry:
	if (get_user(uval, uaddr))
		return -1;

	/*
	 * Special case for regular (non PI) futexes. The unlock path in
	 * user space has two race scenarios:
	 *
	 * 1. The unlock path releases the user space futex value and
	 *    before it can execute the futex() syscall to wake up
	 *    waiters it is killed.
	 *
	 * 2. A woken up waiter is killed before it can acquire the
	 *    futex in user space.
	 *
	 * In both cases the TID validation below prevents a wakeup of
	 * potential waiters which can cause these waiters to block
	 * forever.
	 *
	 * In both cases the following conditions are met:
	 *
	 *	1) task->robust_list->list_op_pending != NULL
	 *	   @pending_op == true
	 *	2) User space futex value == 0
	 *	3) Regular futex: @pi == false
	 *
	 * If these conditions are met, it is safe to attempt waking up a
	 * potential waiter without touching the user space futex value and
	 * trying to set the OWNER_DIED bit. The user space futex value is
	 * uncontended and the rest of the user space mutex state is
	 * consistent, so a woken waiter will just take over the
	 * uncontended futex. Setting the OWNER_DIED bit would create
	 * inconsistent state and malfunction of the user space owner died
	 * handling.
	 */
	if (pending_op && !pi && !uval) {
		futex_wake(uaddr, 1, 1, FUTEX_BITSET_MATCH_ANY);
		return 0;
	}

	if ((uval & FUTEX_TID_MASK) != task_pid_vnr(curr))
		return 0;

	/*
	 * Ok, this dying thread is truly holding a futex
	 * of interest. Set the OWNER_DIED bit atomically
	 * via cmpxchg, and if the value had FUTEX_WAITERS
	 * set, wake up a waiter (if any). (We have to do a
	 * futex_wake() even if OWNER_DIED is already set -
	 * to handle the rare but possible case of recursive
	 * thread-death.) The rest of the cleanup is done in
	 * userspace.
	 */
	mval = (uval & FUTEX_WAITERS) | FUTEX_OWNER_DIED;

	/*
	 * We are not holding a lock here, but we want to have
	 * the pagefault_disable/enable() protection because
	 * we want to handle the fault gracefully. If the
	 * access fails we try to fault in the futex with R/W
	 * verification via get_user_pages. get_user() above
	 * does not guarantee R/W access. If that fails we
	 * give up and leave the futex locked.
	 */
	if ((err = futex_cmpxchg_value_locked(&nval, uaddr, uval, mval))) {
		switch (err) {
		case -EFAULT:
			if (fault_in_user_writeable(uaddr))
				return -1;
			goto retry;

		case -EAGAIN:
			cond_resched();
			goto retry;

		default:
			WARN_ON_ONCE(1);
			return err;
		}
	}

	if (nval != uval)
		goto retry;

	/*
	 * Wake robust non-PI futexes here. The wakeup of
	 * PI futexes happens in exit_pi_state():
	 */
	if (!pi && (uval & FUTEX_WAITERS))
		futex_wake(uaddr, 1, 1, FUTEX_BITSET_MATCH_ANY);

	return 0;
}

/*
 * Fetch a robust-list pointer. Bit 0 signals PI futexes:
 */
static inline int fetch_robust_entry(struct robust_list __user **entry,
				     struct robust_list __user * __user *head,
				     unsigned int *pi)
{
	unsigned long uentry;

	if (get_user(uentry, (unsigned long __user *)head))
		return -EFAULT;

	*entry = (void __user *)(uentry & ~1UL);
	*pi = uentry & 1;

	return 0;
}

/*
 * Walk curr->robust_list (very carefully, it's a userspace list!)
 * and mark any locks found there dead, and notify any waiters.
 *
 * We silently return on any sign of list-walking problem.
 */
static void exit_robust_list(struct task_struct *curr)
{
	struct robust_list_head __user *head = curr->robust_list;
	struct robust_list __user *entry, *next_entry, *pending;
	unsigned int limit = ROBUST_LIST_LIMIT, pi, pip;
	unsigned int next_pi;
	unsigned long futex_offset;
	int rc;

	if (!futex_cmpxchg_enabled)
		return;

	/*
	 * Fetch the list head (which was registered earlier, via
	 * sys_set_robust_list()):
	 */
	if (fetch_robust_entry(&entry, &head->list.next, &pi))
		return;
	/*
	 * Fetch the relative futex offset:
	 */
	if (get_user(futex_offset, &head->futex_offset))
		return;
	/*
	 * Fetch any possibly pending lock-add first, and handle it
	 * if it exists:
	 */
	if (fetch_robust_entry(&pending, &head->list_op_pending, &pip))
		return;

	next_entry = NULL;	/* avoid warning with gcc */
	while (entry != &head->list) {
		/*
		 * Fetch the next entry in the list before calling
		 * handle_futex_death:
		 */
		rc = fetch_robust_entry(&next_entry, &entry->next, &next_pi);
		/*
		 * A pending lock might already be on the list, so
		 * don't process it twice:
		 */
		if (entry != pending) {
			if (handle_futex_death((void __user *)entry + futex_offset,
						curr, pi, HANDLE_DEATH_LIST))
				return;
		}
		if (rc)
			return;
		entry = next_entry;
		pi = next_pi;
		/*
		 * Avoid excessively long or circular lists:
		 */
		if (!--limit)
			break;

		cond_resched();
	}

	if (pending) {
		handle_futex_death((void __user *)pending + futex_offset,
				   curr, pip, HANDLE_DEATH_PENDING);
	}
}

#ifdef CONFIG_COMPAT
static void __user *futex_uaddr(struct robust_list __user *entry,
				compat_long_t futex_offset)
{
	compat_uptr_t base = ptr_to_compat(entry);
	void __user *uaddr = compat_ptr(base + futex_offset);

	return uaddr;
}

/*
 * Fetch a robust-list pointer. Bit 0 signals PI futexes:
 */
static inline int
compat_fetch_robust_entry(compat_uptr_t *uentry, struct robust_list __user **entry,
		   compat_uptr_t __user *head, unsigned int *pi)
{
	if (get_user(*uentry, head))
		return -EFAULT;

	*entry = compat_ptr((*uentry) & ~1);
	*pi = (unsigned int)(*uentry) & 1;

	return 0;
}

/*
 * Walk curr->robust_list (very carefully, it's a userspace list!)
 * and mark any locks found there dead, and notify any waiters.
 *
 * We silently return on any sign of list-walking problem.
 */
static void compat_exit_robust_list(struct task_struct *curr)
{
	struct compat_robust_list_head __user *head = curr->compat_robust_list;
	struct robust_list __user *entry, *next_entry, *pending;
	unsigned int limit = ROBUST_LIST_LIMIT, pi, pip;
	unsigned int next_pi;
	compat_uptr_t uentry, next_uentry, upending;
	compat_long_t futex_offset;
	int rc;

	if (!futex_cmpxchg_enabled)
		return;

	/*
	 * Fetch the list head (which was registered earlier, via
	 * sys_set_robust_list()):
	 */
	if (compat_fetch_robust_entry(&uentry, &entry, &head->list.next, &pi))
		return;
	/*
	 * Fetch the relative futex offset:
	 */
	if (get_user(futex_offset, &head->futex_offset))
		return;
	/*
	 * Fetch any possibly pending lock-add first, and handle it
	 * if it exists:
	 */
	if (compat_fetch_robust_entry(&upending, &pending,
			       &head->list_op_pending, &pip))
		return;

	next_entry = NULL;	/* avoid warning with gcc */
	while (entry != (struct robust_list __user *) &head->list) {
		/*
		 * Fetch the next entry in the list before calling
		 * handle_futex_death:
		 */
		rc = compat_fetch_robust_entry(&next_uentry, &next_entry,
			(compat_uptr_t __user *)&entry->next, &next_pi);
		/*
		 * A pending lock might already be on the list, so
		 * dont process it twice:
		 */
		if (entry != pending) {
			void __user *uaddr = futex_uaddr(entry, futex_offset);

			if (handle_futex_death(uaddr, curr, pi,
					       HANDLE_DEATH_LIST))
				return;
		}
		if (rc)
			return;
		uentry = next_uentry;
		entry = next_entry;
		pi = next_pi;
		/*
		 * Avoid excessively long or circular lists:
		 */
		if (!--limit)
			break;

		cond_resched();
	}
	if (pending) {
		void __user *uaddr = futex_uaddr(pending, futex_offset);

		handle_futex_death(uaddr, curr, pip, HANDLE_DEATH_PENDING);
	}
}
#endif

#ifdef CONFIG_FUTEX_PI

/*
 * This task is holding PI mutexes at exit time => bad.
 * Kernel cleans up PI-state, but userspace is likely hosed.
 * (Robust-futex cleanup is separate and might save the day for userspace.)
 */
static void exit_pi_state_list(struct task_struct *curr)
{
	struct list_head *next, *head = &curr->pi_state_list;
	struct futex_pi_state *pi_state;
	struct futex_hash_bucket *hb;
	union futex_key key = FUTEX_KEY_INIT;

	if (!futex_cmpxchg_enabled)
		return;
	/*
	 * We are a ZOMBIE and nobody can enqueue itself on
	 * pi_state_list anymore, but we have to be careful
	 * versus waiters unqueueing themselves:
	 */
	raw_spin_lock_irq(&curr->pi_lock);
	while (!list_empty(head)) {
		next = head->next;
		pi_state = list_entry(next, struct futex_pi_state, list);
		key = pi_state->key;
		hb = futex_hash(&key);

		/*
		 * We can race against put_pi_state() removing itself from the
		 * list (a waiter going away). put_pi_state() will first
		 * decrement the reference count and then modify the list, so
		 * its possible to see the list entry but fail this reference
		 * acquire.
		 *
		 * In that case; drop the locks to let put_pi_state() make
		 * progress and retry the loop.
		 */
		if (!refcount_inc_not_zero(&pi_state->refcount)) {
			raw_spin_unlock_irq(&curr->pi_lock);
			cpu_relax();
			raw_spin_lock_irq(&curr->pi_lock);
			continue;
		}
		raw_spin_unlock_irq(&curr->pi_lock);

		spin_lock(&hb->lock);
		raw_spin_lock_irq(&pi_state->pi_mutex.wait_lock);
		raw_spin_lock(&curr->pi_lock);
		/*
		 * We dropped the pi-lock, so re-check whether this
		 * task still owns the PI-state:
		 */
		if (head->next != next) {
			/* retain curr->pi_lock for the loop invariant */
			raw_spin_unlock(&pi_state->pi_mutex.wait_lock);
			spin_unlock(&hb->lock);
			put_pi_state(pi_state);
			continue;
		}

		WARN_ON(pi_state->owner != curr);
		WARN_ON(list_empty(&pi_state->list));
		list_del_init(&pi_state->list);
		pi_state->owner = NULL;

		raw_spin_unlock(&curr->pi_lock);
		raw_spin_unlock_irq(&pi_state->pi_mutex.wait_lock);
		spin_unlock(&hb->lock);

		rt_mutex_futex_unlock(&pi_state->pi_mutex);
		put_pi_state(pi_state);

		raw_spin_lock_irq(&curr->pi_lock);
	}
	raw_spin_unlock_irq(&curr->pi_lock);
}
#else
static inline void exit_pi_state_list(struct task_struct *curr) { }
#endif

static void futex_cleanup(struct task_struct *tsk)
{
	if (unlikely(tsk->robust_list)) {
		exit_robust_list(tsk);
		tsk->robust_list = NULL;
	}

#ifdef CONFIG_COMPAT
	if (unlikely(tsk->compat_robust_list)) {
		compat_exit_robust_list(tsk);
		tsk->compat_robust_list = NULL;
	}
#endif

	if (unlikely(!list_empty(&tsk->pi_state_list)))
		exit_pi_state_list(tsk);
}

/**
 * futex_exit_recursive - Set the tasks futex state to FUTEX_STATE_DEAD
 * @tsk:	task to set the state on
 *
 * Set the futex exit state of the task lockless. The futex waiter code
 * observes that state when a task is exiting and loops until the task has
 * actually finished the futex cleanup. The worst case for this is that the
 * waiter runs through the wait loop until the state becomes visible.
 *
 * This is called from the recursive fault handling path in do_exit().
 *
 * This is best effort. Either the futex exit code has run already or
 * not. If the OWNER_DIED bit has been set on the futex then the waiter can
 * take it over. If not, the problem is pushed back to user space. If the
 * futex exit code did not run yet, then an already queued waiter might
 * block forever, but there is nothing which can be done about that.
 */
void futex_exit_recursive(struct task_struct *tsk)
{
	/* If the state is FUTEX_STATE_EXITING then futex_exit_mutex is held */
	if (tsk->futex_state == FUTEX_STATE_EXITING)
		mutex_unlock(&tsk->futex_exit_mutex);
	tsk->futex_state = FUTEX_STATE_DEAD;
}

static void futex_cleanup_begin(struct task_struct *tsk)
{
	/*
	 * Prevent various race issues against a concurrent incoming waiter
	 * including live locks by forcing the waiter to block on
	 * tsk->futex_exit_mutex when it observes FUTEX_STATE_EXITING in
	 * attach_to_pi_owner().
	 */
	mutex_lock(&tsk->futex_exit_mutex);

	/*
	 * Switch the state to FUTEX_STATE_EXITING under tsk->pi_lock.
	 *
	 * This ensures that all subsequent checks of tsk->futex_state in
	 * attach_to_pi_owner() must observe FUTEX_STATE_EXITING with
	 * tsk->pi_lock held.
	 *
	 * It guarantees also that a pi_state which was queued right before
	 * the state change under tsk->pi_lock by a concurrent waiter must
	 * be observed in exit_pi_state_list().
	 */
	raw_spin_lock_irq(&tsk->pi_lock);
	tsk->futex_state = FUTEX_STATE_EXITING;
	raw_spin_unlock_irq(&tsk->pi_lock);
}

static void futex_cleanup_end(struct task_struct *tsk, int state)
{
	/*
	 * Lockless store. The only side effect is that an observer might
	 * take another loop until it becomes visible.
	 */
	tsk->futex_state = state;
	/*
	 * Drop the exit protection. This unblocks waiters which observed
	 * FUTEX_STATE_EXITING to reevaluate the state.
	 */
	mutex_unlock(&tsk->futex_exit_mutex);
}

void futex_exec_release(struct task_struct *tsk)
{
	/*
	 * The state handling is done for consistency, but in the case of
	 * exec() there is no way to prevent further damage as the PID stays
	 * the same. But for the unlikely and arguably buggy case that a
	 * futex is held on exec(), this provides at least as much state
	 * consistency protection which is possible.
	 */
	futex_cleanup_begin(tsk);
	futex_cleanup(tsk);
	/*
	 * Reset the state to FUTEX_STATE_OK. The task is alive and about
	 * exec a new binary.
	 */
	futex_cleanup_end(tsk, FUTEX_STATE_OK);
}

void futex_exit_release(struct task_struct *tsk)
{
	futex_cleanup_begin(tsk);
	futex_cleanup(tsk);
	futex_cleanup_end(tsk, FUTEX_STATE_DEAD);
}

static void __init futex_detect_cmpxchg(void)
{
#ifndef CONFIG_HAVE_FUTEX_CMPXCHG
	u32 curval;

	/*
	 * This will fail and we want it. Some arch implementations do
	 * runtime detection of the futex_atomic_cmpxchg_inatomic()
	 * functionality. We want to know that before we call in any
	 * of the complex code paths. Also we want to prevent
	 * registration of robust lists in that case. NULL is
	 * guaranteed to fault and we get -EFAULT on functional
	 * implementation, the non-functional ones will return
	 * -ENOSYS.
	 */
	if (futex_cmpxchg_value_locked(&curval, NULL, 0, 0) == -EFAULT)
		futex_cmpxchg_enabled = 1;
#endif
}

static int __init futex_init(void)
{
	unsigned int futex_shift;
	unsigned long i;

#if CONFIG_BASE_SMALL
	futex_hashsize = 16;
#else
	futex_hashsize = roundup_pow_of_two(256 * num_possible_cpus());
#endif

	futex_queues = alloc_large_system_hash("futex", sizeof(*futex_queues),
					       futex_hashsize, 0,
					       futex_hashsize < 256 ? HASH_SMALL : 0,
					       &futex_shift, NULL,
					       futex_hashsize, futex_hashsize);
	futex_hashsize = 1UL << futex_shift;

	futex_detect_cmpxchg();

	for (i = 0; i < futex_hashsize; i++) {
		atomic_set(&futex_queues[i].waiters, 0);
		plist_head_init(&futex_queues[i].chain);
		spin_lock_init(&futex_queues[i].lock);
	}

	return 0;
}
core_initcall(futex_init);