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| author | Yang Shi <yang.shi@linux.alibaba.com> | 2018-10-26 15:07:15 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-10-26 16:26:33 -0700 |
| commit | b4cefb36051244bcb5651026d862c332a6cac7df (patch) | |
| tree | b8fc64f082c88af99fe03cff7d030f1c91e4103c | |
| parent | dd2283f2605e3b3e9c61bcae844b34f2afa4813f (diff) | |
| download | linux-b4cefb36051244bcb5651026d862c332a6cac7df.tar.gz linux-b4cefb36051244bcb5651026d862c332a6cac7df.tar.bz2 linux-b4cefb36051244bcb5651026d862c332a6cac7df.zip | |
mm: unmap VM_HUGETLB mappings with optimized path
When unmapping VM_HUGETLB mappings, vm flags need to be updated. Since
the vmas have been detached, so it sounds safe to update vm flags with
read mmap_sem.
Link: http://lkml.kernel.org/r/1537376621-51150-3-git-send-email-yang.shi@linux.alibaba.com
Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com>
Reviewed-by: Matthew Wilcox <willy@infradead.org>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/mmap.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index 330f12c17fa1..ea3188bcc9b4 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2777,7 +2777,7 @@ static int __do_munmap(struct mm_struct *mm, unsigned long start, size_t len, * update vm_flags. */ if (downgrade && - (tmp->vm_flags & (VM_HUGETLB | VM_PFNMAP))) + (tmp->vm_flags & VM_PFNMAP)) downgrade = false; tmp = tmp->vm_next; |