The patch titled
Subject: mm/mmap.c: use mmap_assert_write_locked() instead of open coding it
has been added to the -mm tree. Its filename is
mm-use-mmap_assert_write_locked-instead-of-open-coding-it.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-use-mmap_assert_write_locked-instead-of-open-coding-it.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-use-mmap_assert_write_locked-instead-of-open-coding-it.patch
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------------------------------------------------------
From: Rolf Eike Beer <eb@xxxxxxxxx>
Subject: mm/mmap.c: use mmap_assert_write_locked() instead of open coding it
In case the lock is actually not held at this point this also avoids a
stale lock reference if built with NDEBUG.
Link: https://lkml.kernel.org/r/5827758.TJ1SttVevJ@xxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Rolf Eike Beer <eb@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mmap.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/mm/mmap.c~mm-use-mmap_assert_write_locked-instead-of-open-coding-it
+++ a/mm/mmap.c
@@ -3561,7 +3561,7 @@ int mm_take_all_locks(struct mm_struct *
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);
@@ -3641,7 +3641,7 @@ void mm_drop_all_locks(struct mm_struct
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) {
_
Patches currently in -mm which might be from eb@xxxxxxxxx are
mm-use-mmap_assert_write_locked-instead-of-open-coding-it.patch
