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mm/mmap.c: use mmap_assert_write_locked() instead of open coding it 

In case the lock is actually not held at this point.

Link: https://lkml.kernel.org/r/5827758.TJ1SttVevJ@mobilepool36.emlix.com
Signed-off-by: Rolf Eike Beer <eb@emlix.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Rolf Eike Beer 2022-04-28 23:16:11 -07:00 committed by akpm
parent 241ec63a9a
commit 325bca1fe0
1 changed files with 2 additions and 2 deletions
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4
mm/mmap.c
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@ -3553,7 +3553,7 @@ int mm_take_all_locks(struct mm_struct *mm)
struct vm_area_struct *vma;
struct anon_vma_chain *avc;
BUG_ON(mmap_read_trylock(mm));
mmap_assert_write_locked(mm);
mutex_lock(&mm_all_locks_mutex);
@ -3633,7 +3633,7 @@ void mm_drop_all_locks(struct mm_struct *mm)
struct vm_area_struct *vma;
struct anon_vma_chain *avc;
BUG_ON(mmap_read_trylock(mm));
mmap_assert_write_locked(mm);
BUG_ON(!mutex_is_locked(&mm_all_locks_mutex));
for (vma = mm->mmap; vma; vma = vma->vm_next) {