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| author |   Michel Lespinasse <walken@google.com> | 2020-06-08 21:33:44 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-09 09:39:14 -0700 |
| commit | 42fc541404f249778e752ab39c8bc25fcb2dbe1e (patch) | |
| tree | b88977e7c8f7797b8e7f910c327406b766ddaa20 /mm | |
| parent | mmap locking API: add MMAP_LOCK_INITIALIZER (diff) | |
| download | wireguard-linux-42fc541404f249778e752ab39c8bc25fcb2dbe1e.tar.xz wireguard-linux-42fc541404f249778e752ab39c8bc25fcb2dbe1e.zip | |
mmap locking API: add mmap_assert_locked() and mmap_assert_write_locked()
Add new APIs to assert that mmap_sem is held.
Using this instead of rwsem_is_locked and lockdep_assert_held[_write]
makes the assertions more tolerant of future changes to the lock type.
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: Daniel Jordan <daniel.m.jordan@oracle.com>
Cc: Davidlohr Bueso <dbueso@suse.de>
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/20200520052908.204642-10-walken@google.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/gup.c | 2 | ||||
| -rw-r--r-- | mm/hmm.c | 2 | ||||
| -rw-r--r-- | mm/memory.c | 2 | ||||
| -rw-r--r-- | mm/mmu_notifier.c | 6 | ||||
| -rw-r--r-- | mm/pagewalk.c | 6 | ||||
| -rw-r--r-- | mm/util.c | 2 |
6 files changed, 10 insertions, 10 deletions
@@ -1425,7 +1425,7 @@ long populate_vma_page_range(struct vm_area_struct *vma, VM_BUG_ON(end & ~PAGE_MASK); VM_BUG_ON_VMA(start < vma->vm_start, vma); VM_BUG_ON_VMA(end > vma->vm_end, vma); - VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_sem), mm); + mmap_assert_locked(mm); gup_flags = FOLL_TOUCH | FOLL_POPULATE | FOLL_MLOCK; if (vma->vm_flags & VM_LOCKONFAULT) @@ -563,7 +563,7 @@ int hmm_range_fault(struct hmm_range *range) struct mm_struct *mm = range->notifier->mm; int ret; - lockdep_assert_held(&mm->mmap_sem); + mmap_assert_locked(mm); do { /* If range is no longer valid force retry. */ diff --git a/mm/memory.c b/mm/memory.c index 4615d321d77b..533293faaaf5 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1211,7 +1211,7 @@ static inline unsigned long zap_pud_range(struct mmu_gather *tlb, next = pud_addr_end(addr, end); if (pud_trans_huge(*pud) || pud_devmap(*pud)) { if (next - addr != HPAGE_PUD_SIZE) { - VM_BUG_ON_VMA(!rwsem_is_locked(&tlb->mm->mmap_sem), vma); + mmap_assert_locked(tlb->mm); split_huge_pud(vma, pud, addr); } else if (zap_huge_pud(tlb, vma, pud, addr)) goto next; diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c index cfd0a03bf5cc..24eb9d1ed0a7 100644 --- a/mm/mmu_notifier.c +++ b/mm/mmu_notifier.c @@ -609,7 +609,7 @@ int __mmu_notifier_register(struct mmu_notifier *subscription, struct mmu_notifier_subscriptions *subscriptions = NULL; int ret; - lockdep_assert_held_write(&mm->mmap_sem); + mmap_assert_write_locked(mm); BUG_ON(atomic_read(&mm->mm_users) <= 0); if (IS_ENABLED(CONFIG_LOCKDEP)) { @@ -761,7 +761,7 @@ struct mmu_notifier *mmu_notifier_get_locked(const struct mmu_notifier_ops *ops, struct mmu_notifier *subscription; int ret; - lockdep_assert_held_write(&mm->mmap_sem); + mmap_assert_write_locked(mm); if (mm->notifier_subscriptions) { subscription = find_get_mmu_notifier(mm, ops); @@ -1006,7 +1006,7 @@ int mmu_interval_notifier_insert_locked( mm->notifier_subscriptions; int ret; - lockdep_assert_held_write(&mm->mmap_sem); + mmap_assert_write_locked(mm); if (!subscriptions || !subscriptions->has_itree) { ret = __mmu_notifier_register(NULL, mm); diff --git a/mm/pagewalk.c b/mm/pagewalk.c index 928df1638c30..3b452aa05cd0 100644 --- a/mm/pagewalk.c +++ b/mm/pagewalk.c @@ -395,7 +395,7 @@ int walk_page_range(struct mm_struct *mm, unsigned long start, if (!walk.mm) return -EINVAL; - lockdep_assert_held(&walk.mm->mmap_sem); + mmap_assert_locked(walk.mm); vma = find_vma(walk.mm, start); do { @@ -453,7 +453,7 @@ int walk_page_range_novma(struct mm_struct *mm, unsigned long start, if (start >= end || !walk.mm) return -EINVAL; - lockdep_assert_held(&walk.mm->mmap_sem); + mmap_assert_locked(walk.mm); return __walk_page_range(start, end, &walk); } @@ -472,7 +472,7 @@ int walk_page_vma(struct vm_area_struct *vma, const struct mm_walk_ops *ops, if (!walk.mm) return -EINVAL; - lockdep_assert_held(&walk.mm->mmap_sem); + mmap_assert_locked(walk.mm); err = walk_page_test(vma->vm_start, vma->vm_end, &walk); if (err > 0) diff --git a/mm/util.c b/mm/util.c index e7e8647fa205..09f62d7d6e3e 100644 --- a/mm/util.c +++ b/mm/util.c @@ -437,7 +437,7 @@ int __account_locked_vm(struct mm_struct *mm, unsigned long pages, bool inc, unsigned long locked_vm, limit; int ret = 0; - lockdep_assert_held_write(&mm->mmap_sem); + mmap_assert_write_locked(mm); locked_vm = mm->locked_vm; if (inc) { |