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authorMichel Lespinasse <walken@google.com>2020-06-08 21:33:47 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-09 09:39:14 -0700
commitda1c55f1b272f4bd54671d459b39ea7b54944ef9 (patch)
treec4e379582d0860861c2a00414a01597a83bfbd2b
parent42fc541404f249778e752ab39c8bc25fcb2dbe1e (diff)
mmap locking API: rename mmap_sem to mmap_lock
Rename the mmap_sem field to mmap_lock. Any new uses of this lock should now go through the new mmap locking api. The mmap_lock is still implemented as a rwsem, though this could change in the future. [akpm@linux-foundation.org: fix it for mm-gup-might_lock_readmmap_sem-in-get_user_pages_fast.patch] Signed-off-by: Michel Lespinasse <walken@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Davidlohr Bueso <dbueso@suse.de> Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com> Cc: David Rientjes <rientjes@google.com> Cc: Hugh Dickins <hughd@google.com> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: Jerome Glisse <jglisse@redhat.com> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Laurent Dufour <ldufour@linux.ibm.com> Cc: Liam Howlett <Liam.Howlett@oracle.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ying Han <yinghan@google.com> Link: http://lkml.kernel.org/r/20200520052908.204642-11-walken@google.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/ia64/mm/fault.c4
-rw-r--r--arch/x86/mm/fault.c2
-rw-r--r--drivers/gpu/drm/etnaviv/etnaviv_gem.c2
-rw-r--r--include/linux/mm_types.h2
-rw-r--r--include/linux/mmap_lock.h38
-rw-r--r--mm/gup.c2
-rw-r--r--mm/memory.c2
-rw-r--r--mm/mmap.c4
-rw-r--r--mm/mmu_notifier.c2
9 files changed, 29 insertions, 29 deletions
diff --git a/arch/ia64/mm/fault.c b/arch/ia64/mm/fault.c
index 245545b43a4c..e9ce969c8b73 100644
--- a/arch/ia64/mm/fault.c
+++ b/arch/ia64/mm/fault.c
@@ -74,8 +74,8 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re
mask = ((((isr >> IA64_ISR_X_BIT) & 1UL) << VM_EXEC_BIT)
| (((isr >> IA64_ISR_W_BIT) & 1UL) << VM_WRITE_BIT));
- /* mmap_sem is performance critical.... */
- prefetchw(&mm->mmap_sem);
+ /* mmap_lock is performance critical.... */
+ prefetchw(&mm->mmap_lock);
/*
* If we're in an interrupt or have no user context, we must not take the fault..
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 8e7e4c2bd527..c23bcd027ae1 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -1359,7 +1359,7 @@ dotraplinkage void
do_page_fault(struct pt_regs *regs, unsigned long hw_error_code,
unsigned long address)
{
- prefetchw(&current->mm->mmap_sem);
+ prefetchw(&current->mm->mmap_lock);
/*
* KVM has two types of events that are, logically, interrupts, but
* are unfortunately delivered using the #PF vector. These events are
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
index dc9ef302f517..701f3995f621 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
@@ -661,7 +661,7 @@ static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj)
struct etnaviv_gem_userptr *userptr = &etnaviv_obj->userptr;
int ret, pinned = 0, npages = etnaviv_obj->base.size >> PAGE_SHIFT;
- might_lock_read(&current->mm->mmap_sem);
+ might_lock_read(&current->mm->mmap_lock);
if (userptr->mm != current->mm)
return -EPERM;
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index ef6d3aface8a..b6639b30a83b 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -440,7 +440,7 @@ struct mm_struct {
spinlock_t page_table_lock; /* Protects page tables and some
* counters
*/
- struct rw_semaphore mmap_sem;
+ struct rw_semaphore mmap_lock;
struct list_head mmlist; /* List of maybe swapped mm's. These
* are globally strung together off
diff --git a/include/linux/mmap_lock.h b/include/linux/mmap_lock.h
index 43ef914e6468..0707671851a8 100644
--- a/include/linux/mmap_lock.h
+++ b/include/linux/mmap_lock.h
@@ -4,67 +4,67 @@
#include <linux/mmdebug.h>
#define MMAP_LOCK_INITIALIZER(name) \
- .mmap_sem = __RWSEM_INITIALIZER((name).mmap_sem),
+ .mmap_lock = __RWSEM_INITIALIZER((name).mmap_lock),
static inline void mmap_init_lock(struct mm_struct *mm)
{
- init_rwsem(&mm->mmap_sem);
+ init_rwsem(&mm->mmap_lock);
}
static inline void mmap_write_lock(struct mm_struct *mm)
{
- down_write(&mm->mmap_sem);
+ down_write(&mm->mmap_lock);
}
static inline void mmap_write_lock_nested(struct mm_struct *mm, int subclass)
{
- down_write_nested(&mm->mmap_sem, subclass);
+ down_write_nested(&mm->mmap_lock, subclass);
}
static inline int mmap_write_lock_killable(struct mm_struct *mm)
{
- return down_write_killable(&mm->mmap_sem);
+ return down_write_killable(&mm->mmap_lock);
}
static inline bool mmap_write_trylock(struct mm_struct *mm)
{
- return down_write_trylock(&mm->mmap_sem) != 0;
+ return down_write_trylock(&mm->mmap_lock) != 0;
}
static inline void mmap_write_unlock(struct mm_struct *mm)
{
- up_write(&mm->mmap_sem);
+ up_write(&mm->mmap_lock);
}
static inline void mmap_write_downgrade(struct mm_struct *mm)
{
- downgrade_write(&mm->mmap_sem);
+ downgrade_write(&mm->mmap_lock);
}
static inline void mmap_read_lock(struct mm_struct *mm)
{
- down_read(&mm->mmap_sem);
+ down_read(&mm->mmap_lock);
}
static inline int mmap_read_lock_killable(struct mm_struct *mm)
{
- return down_read_killable(&mm->mmap_sem);
+ return down_read_killable(&mm->mmap_lock);
}
static inline bool mmap_read_trylock(struct mm_struct *mm)
{
- return down_read_trylock(&mm->mmap_sem) != 0;
+ return down_read_trylock(&mm->mmap_lock) != 0;
}
static inline void mmap_read_unlock(struct mm_struct *mm)
{
- up_read(&mm->mmap_sem);
+ up_read(&mm->mmap_lock);
}
static inline bool mmap_read_trylock_non_owner(struct mm_struct *mm)
{
- if (down_read_trylock(&mm->mmap_sem)) {
- rwsem_release(&mm->mmap_sem.dep_map, _RET_IP_);
+ if (down_read_trylock(&mm->mmap_lock)) {
+ rwsem_release(&mm->mmap_lock.dep_map, _RET_IP_);
return true;
}
return false;
@@ -72,19 +72,19 @@ static inline bool mmap_read_trylock_non_owner(struct mm_struct *mm)
static inline void mmap_read_unlock_non_owner(struct mm_struct *mm)
{
- up_read_non_owner(&mm->mmap_sem);
+ up_read_non_owner(&mm->mmap_lock);
}
static inline void mmap_assert_locked(struct mm_struct *mm)
{
- lockdep_assert_held(&mm->mmap_sem);
- VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_sem), mm);
+ lockdep_assert_held(&mm->mmap_lock);
+ VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);
}
static inline void mmap_assert_write_locked(struct mm_struct *mm)
{
- lockdep_assert_held_write(&mm->mmap_sem);
- VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_sem), mm);
+ lockdep_assert_held_write(&mm->mmap_lock);
+ VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm);
}
#endif /* _LINUX_MMAP_LOCK_H */
diff --git a/mm/gup.c b/mm/gup.c
index 279739fbd09a..762fb9f733b2 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -2750,7 +2750,7 @@ static int internal_get_user_pages_fast(unsigned long start, int nr_pages,
return -EINVAL;
if (!(gup_flags & FOLL_FAST_ONLY))
- might_lock_read(&current->mm->mmap_sem);
+ might_lock_read(&current->mm->mmap_lock);
start = untagged_addr(start) & PAGE_MASK;
addr = start;
diff --git a/mm/memory.c b/mm/memory.c
index 533293faaaf5..823982a8f0b0 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4804,7 +4804,7 @@ void __might_fault(const char *file, int line)
__might_sleep(file, line, 0);
#if defined(CONFIG_DEBUG_ATOMIC_SLEEP)
if (current->mm)
- might_lock_read(&current->mm->mmap_sem);
+ might_lock_read(&current->mm->mmap_lock);
#endif
}
EXPORT_SYMBOL(__might_fault);
diff --git a/mm/mmap.c b/mm/mmap.c
index 7ed7cfca451e..a28778da76a3 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3474,7 +3474,7 @@ static void vm_lock_anon_vma(struct mm_struct *mm, struct anon_vma *anon_vma)
* The LSB of head.next can't change from under us
* because we hold the mm_all_locks_mutex.
*/
- down_write_nest_lock(&anon_vma->root->rwsem, &mm->mmap_sem);
+ down_write_nest_lock(&anon_vma->root->rwsem, &mm->mmap_lock);
/*
* We can safely modify head.next after taking the
* anon_vma->root->rwsem. If some other vma in this mm shares
@@ -3504,7 +3504,7 @@ static void vm_lock_mapping(struct mm_struct *mm, struct address_space *mapping)
*/
if (test_and_set_bit(AS_MM_ALL_LOCKS, &mapping->flags))
BUG();
- down_write_nest_lock(&mapping->i_mmap_rwsem, &mm->mmap_sem);
+ down_write_nest_lock(&mapping->i_mmap_rwsem, &mm->mmap_lock);
}
}
diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c
index 24eb9d1ed0a7..2f348b6c9c9a 100644
--- a/mm/mmu_notifier.c
+++ b/mm/mmu_notifier.c
@@ -983,7 +983,7 @@ int mmu_interval_notifier_insert(struct mmu_interval_notifier *interval_sub,
struct mmu_notifier_subscriptions *subscriptions;
int ret;
- might_lock(&mm->mmap_sem);
+ might_lock(&mm->mmap_lock);
subscriptions = smp_load_acquire(&mm->notifier_subscriptions);
if (!subscriptions || !subscriptions->has_itree) {