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mm: unmap VM_PFNMAP mappings with optimized path

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When unmapping VM_PFNMAP 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/[email protected]
Signed-off-by: Yang Shi <[email protected]>
Reviewed-by: Matthew Wilcox <[email protected]>
Acked-by: Kirill A. Shutemov <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Yang Shi 2018-10-26 15:07:18 -07:00 • committed by Linus Torvalds
commit cb4922496a
1 changed files with 0 additions and 9 deletions
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9
mm/mmap.c
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@ -2771,15 +2771,6 @@ static int __do_munmap(struct mm_struct *mm, unsigned long start, size_t len,
munlock_vma_pages_all(tmp);
}
/*
* Unmapping vmas, which have VM_HUGETLB or VM_PFNMAP,
* need get done with write mmap_sem held since they may
* update vm_flags.
*/
if (downgrade &&
(tmp->vm_flags & VM_PFNMAP))
downgrade = false;
tmp = tmp->vm_next;
}
}