Messages in this thread Patch in this message | | | From | Yang Shi <> | Subject | [v11 PATCH 2/3] mm: unmap VM_HUGETLB mappings with optimized path | Date | Thu, 20 Sep 2018 01:03:40 +0800 |
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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.
Cc: Michal Hocko <mhocko@kernel.org> Cc: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Matthew Wilcox <willy@infradead.org> Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com> --- mm/mmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/mmap.c b/mm/mmap.c index 982dd00..490340e 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; -- 1.8.3.1
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