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authorLinus Torvalds <torvalds@linux-foundation.org>2023-11-02 20:53:31 -1000
committerLinus Torvalds <torvalds@linux-foundation.org>2023-11-02 20:53:31 -1000
commit8f6f76a6a29f36d2f3e4510d0bde5046672f6924 (patch)
tree41e31fd924728d6bec5078db0f95b10dec5e5b6e /fs
parentecae0bd5173b1014f95a14a8dfbe40ec10367dcf (diff)
parent6620999f0d41e4fd6f047727936a964c3399d249 (diff)
Merge tag 'mm-nonmm-stable-2023-11-02-14-08' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull non-MM updates from Andrew Morton: "As usual, lots of singleton and doubleton patches all over the tree and there's little I can say which isn't in the individual changelogs. The lengthier patch series are - 'kdump: use generic functions to simplify crashkernel reservation in arch', from Baoquan He. This is mainly cleanups and consolidation of the 'crashkernel=' kernel parameter handling - After much discussion, David Laight's 'minmax: Relax type checks in min() and max()' is here. Hopefully reduces some typecasting and the use of min_t() and max_t() - A group of patches from Oleg Nesterov which clean up and slightly fix our handling of reads from /proc/PID/task/... and which remove task_struct.thread_group" * tag 'mm-nonmm-stable-2023-11-02-14-08' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (64 commits) scripts/gdb/vmalloc: disable on no-MMU scripts/gdb: fix usage of MOD_TEXT not defined when CONFIG_MODULES=n .mailmap: add address mapping for Tomeu Vizoso mailmap: update email address for Claudiu Beznea tools/testing/selftests/mm/run_vmtests.sh: lower the ptrace permissions .mailmap: map Benjamin Poirier's address scripts/gdb: add lx_current support for riscv ocfs2: fix a spelling typo in comment proc: test ProtectionKey in proc-empty-vm test proc: fix proc-empty-vm test with vsyscall fs/proc/base.c: remove unneeded semicolon do_io_accounting: use sig->stats_lock do_io_accounting: use __for_each_thread() ocfs2: replace BUG_ON() at ocfs2_num_free_extents() with ocfs2_error() ocfs2: fix a typo in a comment scripts/show_delta: add __main__ judgement before main code treewide: mark stuff as __ro_after_init fs: ocfs2: check status values proc: test /proc/${pid}/statm compiler.h: move __is_constexpr() to compiler.h ...
Diffstat (limited to 'fs')
-rw-r--r--fs/anon_inodes.c4
-rw-r--r--fs/buffer.c4
-rw-r--r--fs/char_dev.c2
-rw-r--r--fs/dcache.c8
-rw-r--r--fs/direct-io.c2
-rw-r--r--fs/eventpoll.c6
-rw-r--r--fs/fcntl.c2
-rw-r--r--fs/file_table.c2
-rw-r--r--fs/gfs2/ops_fstype.c9
-rw-r--r--fs/inode.c8
-rw-r--r--fs/kernfs/mount.c5
-rw-r--r--fs/locks.c4
-rw-r--r--fs/namespace.c16
-rw-r--r--fs/notify/dnotify/dnotify.c6
-rw-r--r--fs/notify/fanotify/fanotify_user.c8
-rw-r--r--fs/notify/inotify/inotify_user.c2
-rw-r--r--fs/ocfs2/alloc.c11
-rw-r--r--fs/ocfs2/buffer_head_io.c4
-rw-r--r--fs/ocfs2/dlmfs/dlmfs.c3
-rw-r--r--fs/ocfs2/journal.c2
-rw-r--r--fs/ocfs2/namei.c8
-rw-r--r--fs/ocfs2/quota_local.c4
-rw-r--r--fs/pipe.c2
-rw-r--r--fs/proc/array.c7
-rw-r--r--fs/proc/base.c52
-rw-r--r--fs/proc/inode.c11
-rw-r--r--fs/proc/task_mmu.c11
-rw-r--r--fs/userfaultfd.c2
28 files changed, 110 insertions, 95 deletions
diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c
index 24192a7667ed..d26222b7eefe 100644
--- a/fs/anon_inodes.c
+++ b/fs/anon_inodes.c
@@ -24,8 +24,8 @@
#include <linux/uaccess.h>
-static struct vfsmount *anon_inode_mnt __read_mostly;
-static struct inode *anon_inode_inode;
+static struct vfsmount *anon_inode_mnt __ro_after_init;
+static struct inode *anon_inode_inode __ro_after_init;
/*
* anon_inodefs_dname() is called from d_path().
diff --git a/fs/buffer.c b/fs/buffer.c
index 657a62bab73d..967f34b70aa8 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2983,13 +2983,13 @@ EXPORT_SYMBOL(try_to_free_buffers);
/*
* Buffer-head allocation
*/
-static struct kmem_cache *bh_cachep __read_mostly;
+static struct kmem_cache *bh_cachep __ro_after_init;
/*
* Once the number of bh's in the machine exceeds this level, we start
* stripping them in writeback.
*/
-static unsigned long max_buffer_heads;
+static unsigned long max_buffer_heads __ro_after_init;
int buffer_heads_over_limit;
diff --git a/fs/char_dev.c b/fs/char_dev.c
index 6ba032442b39..57cc096c498a 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -25,7 +25,7 @@
#include "internal.h"
-static struct kobj_map *cdev_map;
+static struct kobj_map *cdev_map __ro_after_init;
static DEFINE_MUTEX(chrdevs_lock);
diff --git a/fs/dcache.c b/fs/dcache.c
index 796e23761ba0..c82ae731df9a 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -78,7 +78,7 @@ __cacheline_aligned_in_smp DEFINE_SEQLOCK(rename_lock);
EXPORT_SYMBOL(rename_lock);
-static struct kmem_cache *dentry_cache __read_mostly;
+static struct kmem_cache *dentry_cache __ro_after_init;
const struct qstr empty_name = QSTR_INIT("", 0);
EXPORT_SYMBOL(empty_name);
@@ -96,9 +96,9 @@ EXPORT_SYMBOL(dotdot_name);
* information, yet avoid using a prime hash-size or similar.
*/
-static unsigned int d_hash_shift __read_mostly;
+static unsigned int d_hash_shift __ro_after_init;
-static struct hlist_bl_head *dentry_hashtable __read_mostly;
+static struct hlist_bl_head *dentry_hashtable __ro_after_init;
static inline struct hlist_bl_head *d_hash(unsigned int hash)
{
@@ -3332,7 +3332,7 @@ static void __init dcache_init(void)
}
/* SLAB cache for __getname() consumers */
-struct kmem_cache *names_cachep __read_mostly;
+struct kmem_cache *names_cachep __ro_after_init;
EXPORT_SYMBOL(names_cachep);
void __init vfs_caches_init_early(void)
diff --git a/fs/direct-io.c b/fs/direct-io.c
index 7bc494ee56b9..20533266ade6 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -151,7 +151,7 @@ struct dio {
};
} ____cacheline_aligned_in_smp;
-static struct kmem_cache *dio_cache __read_mostly;
+static struct kmem_cache *dio_cache __ro_after_init;
/*
* How many pages are in the queue?
diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 1d9a71a0c4c1..2877cc01cff1 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -256,10 +256,10 @@ static u64 loop_check_gen = 0;
static struct eventpoll *inserting_into;
/* Slab cache used to allocate "struct epitem" */
-static struct kmem_cache *epi_cache __read_mostly;
+static struct kmem_cache *epi_cache __ro_after_init;
/* Slab cache used to allocate "struct eppoll_entry" */
-static struct kmem_cache *pwq_cache __read_mostly;
+static struct kmem_cache *pwq_cache __ro_after_init;
/*
* List of files with newly added links, where we may need to limit the number
@@ -271,7 +271,7 @@ struct epitems_head {
};
static struct epitems_head *tfile_check_list = EP_UNACTIVE_PTR;
-static struct kmem_cache *ephead_cache __read_mostly;
+static struct kmem_cache *ephead_cache __ro_after_init;
static inline void free_ephead(struct epitems_head *head)
{
diff --git a/fs/fcntl.c b/fs/fcntl.c
index e871009f6c88..c80a6acad742 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -844,7 +844,7 @@ int send_sigurg(struct fown_struct *fown)
}
static DEFINE_SPINLOCK(fasync_lock);
-static struct kmem_cache *fasync_cache __read_mostly;
+static struct kmem_cache *fasync_cache __ro_after_init;
static void fasync_free_rcu(struct rcu_head *head)
{
diff --git a/fs/file_table.c b/fs/file_table.c
index fa92743ba6a9..de4a2915bfd4 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -40,7 +40,7 @@ static struct files_stat_struct files_stat = {
};
/* SLAB cache for file structures */
-static struct kmem_cache *filp_cachep __read_mostly;
+static struct kmem_cache *filp_cachep __ro_after_init;
static struct percpu_counter nr_files __cacheline_aligned_in_smp;
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index 33ca04733e93..ecf789b7168c 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -1126,8 +1126,7 @@ static int init_threads(struct gfs2_sbd *sdp)
return 0;
fail:
- kthread_stop(sdp->sd_logd_process);
- put_task_struct(sdp->sd_logd_process);
+ kthread_stop_put(sdp->sd_logd_process);
sdp->sd_logd_process = NULL;
return error;
}
@@ -1135,13 +1134,11 @@ fail:
void gfs2_destroy_threads(struct gfs2_sbd *sdp)
{
if (sdp->sd_logd_process) {
- kthread_stop(sdp->sd_logd_process);
- put_task_struct(sdp->sd_logd_process);
+ kthread_stop_put(sdp->sd_logd_process);
sdp->sd_logd_process = NULL;
}
if (sdp->sd_quotad_process) {
- kthread_stop(sdp->sd_quotad_process);
- put_task_struct(sdp->sd_quotad_process);
+ kthread_stop_put(sdp->sd_quotad_process);
sdp->sd_quotad_process = NULL;
}
}
diff --git a/fs/inode.c b/fs/inode.c
index 4f8984b97df0..edcd8a61975f 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -54,9 +54,9 @@
* inode_hash_lock
*/
-static unsigned int i_hash_mask __read_mostly;
-static unsigned int i_hash_shift __read_mostly;
-static struct hlist_head *inode_hashtable __read_mostly;
+static unsigned int i_hash_mask __ro_after_init;
+static unsigned int i_hash_shift __ro_after_init;
+static struct hlist_head *inode_hashtable __ro_after_init;
static __cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_hash_lock);
/*
@@ -70,7 +70,7 @@ EXPORT_SYMBOL(empty_aops);
static DEFINE_PER_CPU(unsigned long, nr_inodes);
static DEFINE_PER_CPU(unsigned long, nr_unused);
-static struct kmem_cache *inode_cachep __read_mostly;
+static struct kmem_cache *inode_cachep __ro_after_init;
static long get_nr_inodes(void)
{
diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
index 79b96e74a8a0..4628edde2e7e 100644
--- a/fs/kernfs/mount.c
+++ b/fs/kernfs/mount.c
@@ -21,8 +21,9 @@
#include "kernfs-internal.h"
-struct kmem_cache *kernfs_node_cache, *kernfs_iattrs_cache;
-struct kernfs_global_locks *kernfs_locks;
+struct kmem_cache *kernfs_node_cache __ro_after_init;
+struct kmem_cache *kernfs_iattrs_cache __ro_after_init;
+struct kernfs_global_locks *kernfs_locks __ro_after_init;
static int kernfs_sop_show_options(struct seq_file *sf, struct dentry *dentry)
{
diff --git a/fs/locks.c b/fs/locks.c
index d4e49a990a8d..46d88b9e222c 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -167,8 +167,8 @@ static DEFINE_HASHTABLE(blocked_hash, BLOCKED_HASH_BITS);
*/
static DEFINE_SPINLOCK(blocked_lock_lock);
-static struct kmem_cache *flctx_cache __read_mostly;
-static struct kmem_cache *filelock_cache __read_mostly;
+static struct kmem_cache *flctx_cache __ro_after_init;
+static struct kmem_cache *filelock_cache __ro_after_init;
static struct file_lock_context *
locks_get_lock_context(struct inode *inode, int type)
diff --git a/fs/namespace.c b/fs/namespace.c
index 6bde71735efa..fbf0e596fcd3 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -39,10 +39,10 @@
/* Maximum number of mounts in a mount namespace */
static unsigned int sysctl_mount_max __read_mostly = 100000;
-static unsigned int m_hash_mask __read_mostly;
-static unsigned int m_hash_shift __read_mostly;
-static unsigned int mp_hash_mask __read_mostly;
-static unsigned int mp_hash_shift __read_mostly;
+static unsigned int m_hash_mask __ro_after_init;
+static unsigned int m_hash_shift __ro_after_init;
+static unsigned int mp_hash_mask __ro_after_init;
+static unsigned int mp_hash_shift __ro_after_init;
static __initdata unsigned long mhash_entries;
static int __init set_mhash_entries(char *str)
@@ -68,9 +68,9 @@ static u64 event;
static DEFINE_IDA(mnt_id_ida);
static DEFINE_IDA(mnt_group_ida);
-static struct hlist_head *mount_hashtable __read_mostly;
-static struct hlist_head *mountpoint_hashtable __read_mostly;
-static struct kmem_cache *mnt_cache __read_mostly;
+static struct hlist_head *mount_hashtable __ro_after_init;
+static struct hlist_head *mountpoint_hashtable __ro_after_init;
+static struct kmem_cache *mnt_cache __ro_after_init;
static DECLARE_RWSEM(namespace_sem);
static HLIST_HEAD(unmounted); /* protected by namespace_sem */
static LIST_HEAD(ex_mountpoints); /* protected by namespace_sem */
@@ -86,7 +86,7 @@ struct mount_kattr {
};
/* /sys/fs */
-struct kobject *fs_kobj;
+struct kobject *fs_kobj __ro_after_init;
EXPORT_SYMBOL_GPL(fs_kobj);
/*
diff --git a/fs/notify/dnotify/dnotify.c b/fs/notify/dnotify/dnotify.c
index 869b016014d2..1cb9ad7e884e 100644
--- a/fs/notify/dnotify/dnotify.c
+++ b/fs/notify/dnotify/dnotify.c
@@ -39,9 +39,9 @@ static void __init dnotify_sysctl_init(void)
#define dnotify_sysctl_init() do { } while (0)
#endif
-static struct kmem_cache *dnotify_struct_cache __read_mostly;
-static struct kmem_cache *dnotify_mark_cache __read_mostly;
-static struct fsnotify_group *dnotify_group __read_mostly;
+static struct kmem_cache *dnotify_struct_cache __ro_after_init;
+static struct kmem_cache *dnotify_mark_cache __ro_after_init;
+static struct fsnotify_group *dnotify_group __ro_after_init;
/*
* dnotify will attach one of these to each inode (i_fsnotify_marks) which
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 62fe0b679e58..45aecdc302f4 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -112,10 +112,10 @@ static void __init fanotify_sysctls_init(void)
extern const struct fsnotify_ops fanotify_fsnotify_ops;
-struct kmem_cache *fanotify_mark_cache __read_mostly;
-struct kmem_cache *fanotify_fid_event_cachep __read_mostly;
-struct kmem_cache *fanotify_path_event_cachep __read_mostly;
-struct kmem_cache *fanotify_perm_event_cachep __read_mostly;
+struct kmem_cache *fanotify_mark_cache __ro_after_init;
+struct kmem_cache *fanotify_fid_event_cachep __ro_after_init;
+struct kmem_cache *fanotify_path_event_cachep __ro_after_init;
+struct kmem_cache *fanotify_perm_event_cachep __ro_after_init;
#define FANOTIFY_EVENT_ALIGN 4
#define FANOTIFY_FID_INFO_HDR_LEN \
diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index 1c4bfdab008d..a3809ae92170 100644
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -49,7 +49,7 @@
/* configurable via /proc/sys/fs/inotify/ */
static int inotify_max_queued_events __read_mostly;
-struct kmem_cache *inotify_inode_mark_cachep __read_mostly;
+struct kmem_cache *inotify_inode_mark_cachep __ro_after_init;
#ifdef CONFIG_SYSCTL
diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index f0937902f7b4..91b32b2377ac 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -967,7 +967,14 @@ int ocfs2_num_free_extents(struct ocfs2_extent_tree *et)
el = &eb->h_list;
}
- BUG_ON(el->l_tree_depth != 0);
+ if (el->l_tree_depth != 0) {
+ retval = ocfs2_error(ocfs2_metadata_cache_get_super(et->et_ci),
+ "Owner %llu has leaf extent block %llu with an invalid l_tree_depth of %u\n",
+ (unsigned long long)ocfs2_metadata_cache_owner(et->et_ci),
+ (unsigned long long)last_eb_blk,
+ le16_to_cpu(el->l_tree_depth));
+ goto bail;
+ }
retval = le16_to_cpu(el->l_count) - le16_to_cpu(el->l_next_free_rec);
bail:
@@ -7642,7 +7649,7 @@ out_mutex:
goto next_group;
}
out:
- range->len = trimmed * sb->s_blocksize;
+ range->len = trimmed * osb->s_clustersize;
return ret;
}
diff --git a/fs/ocfs2/buffer_head_io.c b/fs/ocfs2/buffer_head_io.c
index 196638a22b48..cdb9b9bdea1f 100644
--- a/fs/ocfs2/buffer_head_io.c
+++ b/fs/ocfs2/buffer_head_io.c
@@ -158,7 +158,7 @@ read_failure:
if (new_bh && bh) {
/* If middle bh fails, let previous bh
* finish its read and then put it to
- * aovoid bh leak
+ * avoid bh leak
*/
if (!buffer_jbd(bh))
wait_on_buffer(bh);
@@ -345,7 +345,7 @@ read_failure:
if (new_bh && bh) {
/* If middle bh fails, let previous bh
* finish its read and then put it to
- * aovoid bh leak
+ * avoid bh leak
*/
if (!buffer_jbd(bh))
wait_on_buffer(bh);
diff --git a/fs/ocfs2/dlmfs/dlmfs.c b/fs/ocfs2/dlmfs/dlmfs.c
index 9b57d012fd5c..85215162c9dd 100644
--- a/fs/ocfs2/dlmfs/dlmfs.c
+++ b/fs/ocfs2/dlmfs/dlmfs.c
@@ -80,8 +80,7 @@ static int param_set_dlmfs_capabilities(const char *val,
static int param_get_dlmfs_capabilities(char *buffer,
const struct kernel_param *kp)
{
- return strlcpy(buffer, DLMFS_CAPABILITIES,
- strlen(DLMFS_CAPABILITIES) + 1);
+ return sysfs_emit(buffer, DLMFS_CAPABILITIES);
}
module_param_call(capabilities, param_set_dlmfs_capabilities,
param_get_dlmfs_capabilities, NULL, 0444);
diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index ce215565d061..604fea3a26ff 100644
--- a/fs/ocfs2/journal.c
+++ b/fs/ocfs2/journal.c
@@ -90,7 +90,7 @@ enum ocfs2_replay_state {
struct ocfs2_replay_map {
unsigned int rm_slots;
enum ocfs2_replay_state rm_state;
- unsigned char rm_replay_slots[];
+ unsigned char rm_replay_slots[] __counted_by(rm_slots);
};
static void ocfs2_replay_map_set_state(struct ocfs2_super *osb, int state)
diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index 681e9501cdd3..814733ba2f4b 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -1597,6 +1597,10 @@ static int ocfs2_rename(struct mnt_idmap *idmap,
if (update_dot_dot) {
status = ocfs2_update_entry(old_inode, handle,
&old_inode_dot_dot_res, new_dir);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
drop_nlink(old_dir);
if (new_inode) {
drop_nlink(new_inode);
@@ -1636,6 +1640,10 @@ static int ocfs2_rename(struct mnt_idmap *idmap,
INODE_CACHE(old_dir),
old_dir_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
fe = (struct ocfs2_dinode *) old_dir_bh->b_data;
ocfs2_set_links_count(fe, old_dir->i_nlink);
ocfs2_journal_dirty(handle, old_dir_bh);
diff --git a/fs/ocfs2/quota_local.c b/fs/ocfs2/quota_local.c
index dfaae1e52412..e09842fc9d4d 100644
--- a/fs/ocfs2/quota_local.c
+++ b/fs/ocfs2/quota_local.c
@@ -1240,6 +1240,10 @@ int ocfs2_create_local_dquot(struct dquot *dquot)
&od->dq_local_phys_blk,
&pcount,
NULL);
+ if (status < 0) {
+ mlog_errno(status);
+ goto out;
+ }
/* Initialize dquot structure on disk */
status = ocfs2_local_write_dquot(dquot);
diff --git a/fs/pipe.c b/fs/pipe.c
index 8916c455a469..804a7d789452 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -864,7 +864,7 @@ void free_pipe_info(struct pipe_inode_info *pipe)
kfree(pipe);
}
-static struct vfsmount *pipe_mnt __read_mostly;
+static struct vfsmount *pipe_mnt __ro_after_init;
/*
* pipefs_dname() is called from d_path().
diff --git a/fs/proc/array.c b/fs/proc/array.c
index 2c2efbe685d8..ff08a8957552 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -536,12 +536,13 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
/* add up live thread stats at the group level */
if (whole) {
- struct task_struct *t = task;
- do {
+ struct task_struct *t;
+
+ __for_each_thread(sig, t) {
min_flt += t->min_flt;
maj_flt += t->maj_flt;
gtime += task_gtime(t);
- } while_each_thread(task, t);
+ }
min_flt += sig->min_flt;
maj_flt += sig->maj_flt;
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 83396ab14998..dd31e3b6bf77 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1153,11 +1153,10 @@ err_unlock:
static ssize_t oom_adj_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
- char buffer[PROC_NUMBUF];
+ char buffer[PROC_NUMBUF] = {};
int oom_adj;
int err;
- memset(buffer, 0, sizeof(buffer));
if (count > sizeof(buffer) - 1)
count = sizeof(buffer) - 1;
if (copy_from_user(buffer, buf, count)) {
@@ -1213,11 +1212,10 @@ static ssize_t oom_score_adj_read(struct file *file, char __user *buf,
static ssize_t oom_score_adj_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
- char buffer[PROC_NUMBUF];
+ char buffer[PROC_NUMBUF] = {};
int oom_score_adj;
int err;
- memset(buffer, 0, sizeof(buffer));
if (count > sizeof(buffer) - 1)
count = sizeof(buffer) - 1;
if (copy_from_user(buffer, buf, count)) {
@@ -1358,13 +1356,13 @@ static ssize_t proc_fault_inject_write(struct file * file,
const char __user * buf, size_t count, loff_t *ppos)
{
struct task_struct *task;
- char buffer[PROC_NUMBUF];
+ char buffer[PROC_NUMBUF] = {};
int make_it_fail;
int rv;
if (!capable(CAP_SYS_RESOURCE))
return -EPERM;
- memset(buffer, 0, sizeof(buffer));
+
if (count > sizeof(buffer) - 1)
count = sizeof(buffer) - 1;
if (copy_from_user(buffer, buf, count))
@@ -1509,11 +1507,10 @@ sched_autogroup_write(struct file *file, const char __user *buf,
{
struct inode *inode = file_inode(file);
struct task_struct *p;
- char buffer[PROC_NUMBUF];
+ char buffer[PROC_NUMBUF] = {};
int nice;
int err;
- memset(buffer, 0, sizeof(buffer));
if (count > sizeof(buffer) - 1)
count = sizeof(buffer) - 1;
if (copy_from_user(buffer, buf, count))
@@ -1666,10 +1663,9 @@ static ssize_t comm_write(struct file *file, const char __user *buf,
{
struct inode *inode = file_inode(file);
struct task_struct *p;
- char buffer[TASK_COMM_LEN];
+ char buffer[TASK_COMM_LEN] = {};
const size_t maxlen = sizeof(buffer) - 1;
- memset(buffer, 0, sizeof(buffer));
if (copy_from_user(buffer, buf, count > maxlen ? maxlen : count))
return -EFAULT;
@@ -2976,8 +2972,7 @@ static const struct file_operations proc_coredump_filter_operations = {
#ifdef CONFIG_TASK_IO_ACCOUNTING
static int do_io_accounting(struct task_struct *task, struct seq_file *m, int whole)
{
- struct task_io_accounting acct = task->ioac;
- unsigned long flags;
+ struct task_io_accounting acct;
int result;
result = down_read_killable(&task->signal->exec_update_lock);
@@ -2989,15 +2984,28 @@ static int do_io_accounting(struct task_struct *task, struct seq_file *m, int wh
goto out_unlock;
}
- if (whole && lock_task_sighand(task, &flags)) {
- struct task_struct *t = task;
+ if (whole) {
+ struct signal_struct *sig = task->signal;
+ struct task_struct *t;
+ unsigned int seq = 1;
+ unsigned long flags;
+
+ rcu_read_lock();
+ do {
+ seq++; /* 2 on the 1st/lockless path, otherwise odd */
+ flags = read_seqbegin_or_lock_irqsave(&sig->stats_lock, &seq);
- task_io_accounting_add(&acct, &task->signal->ioac);
- while_each_thread(task, t)
- task_io_accounting_add(&acct, &t->ioac);
+ acct = sig->ioac;
+ __for_each_thread(sig, t)
+ task_io_accounting_add(&acct, &t->ioac);
- unlock_task_sighand(task, &flags);
+ } while (need_seqretry(&sig->stats_lock, seq));
+ done_seqretry_irqrestore(&sig->stats_lock, seq, flags);
+ rcu_read_unlock();
+ } else {
+ acct = task->ioac;
}
+
seq_printf(m,
"rchar: %llu\n"
"wchar: %llu\n"
@@ -3818,7 +3826,7 @@ static struct task_struct *first_tid(struct pid *pid, int tid, loff_t f_pos,
for_each_thread(task, pos) {
if (!nr--)
goto found;
- };
+ }
fail:
pos = NULL;
goto out;
@@ -3840,10 +3848,8 @@ static struct task_struct *next_tid(struct task_struct *start)
struct task_struct *pos = NULL;
rcu_read_lock();
if (pid_alive(start)) {
- pos = next_thread(start);
- if (thread_group_leader(pos))
- pos = NULL;
- else
+ pos = __next_thread(start);
+ if (pos)
get_task_struct(pos);
}
rcu_read_unlock();
diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 592ed2516f47..b33e490e3fd9 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -110,18 +110,15 @@ void __init proc_init_kmemcache(void)
void proc_invalidate_siblings_dcache(struct hlist_head *inodes, spinlock_t *lock)
{
- struct inode *inode;
- struct proc_inode *ei;
struct hlist_node *node;
struct super_block *old_sb = NULL;
rcu_read_lock();
- for (;;) {
+ while ((node = hlist_first_rcu(inodes))) {
+ struct proc_inode *ei = hlist_entry(node, struct proc_inode, sibling_inodes);
struct super_block *sb;
- node = hlist_first_rcu(inodes);
- if (!node)
- break;
- ei = hlist_entry(node, struct proc_inode, sibling_inodes);
+ struct inode *inode;
+
spin_lock(lock);
hlist_del_init_rcu(&ei->sibling_inodes);
spin_unlock(lock);
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 4abd51053f76..ef2eb12906da 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -851,9 +851,7 @@ static void __show_smap(struct seq_file *m, const struct mem_size_stats *mss,
static int show_smap(struct seq_file *m, void *v)
{
struct vm_area_struct *vma = v;
- struct mem_size_stats mss;
-
- memset(&mss, 0, sizeof(mss));
+ struct mem_size_stats mss = {};
smap_gather_stats(vma, &mss, 0);
@@ -879,7 +877,7 @@ static int show_smap(struct seq_file *m, void *v)
static int show_smaps_rollup(struct seq_file *m, void *v)
{
struct proc_maps_private *priv = m->private;
- struct mem_size_stats mss;
+ struct mem_size_stats mss = {};
struct mm_struct *mm = priv->mm;
struct vm_area_struct *vma;
unsigned long vma_start = 0, last_vma_end = 0;
@@ -895,8 +893,6 @@ static int show_smaps_rollup(struct seq_file *m, void *v)
goto out_put_task;
}
- memset(&mss, 0, sizeof(mss));
-
ret = mmap_read_lock_killable(mm);
if (ret)
goto out_put_mm;
@@ -1248,14 +1244,13 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct task_struct *task;
- char buffer[PROC_NUMBUF];
+ char buffer[PROC_NUMBUF] = {};
struct mm_struct *mm;
struct vm_area_struct *vma;
enum clear_refs_types type;
int itype;
int rv;
- memset(buffer, 0, sizeof(buffer));
if (count > sizeof(buffer) - 1)
count = sizeof(buffer) - 1;
if (copy_from_user(buffer, buf, count))
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index ac616cfbacf5..e8af40b05549 100644
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -49,7 +49,7 @@ static struct ctl_table vm_userfaultfd_table[] = {
};
#endif
-static struct kmem_cache *userfaultfd_ctx_cachep __read_mostly;
+static struct kmem_cache *userfaultfd_ctx_cachep __ro_after_init;
/*
* Start with fault_pending_wqh and fault_wqh so they're more likely