The patch titled
Subject: mm/mmap.c: remove a never-triggered warning in __vma_adjust()
has been added to the -mm tree. Its filename is
mm-mmapc-remove-a-never-trigger-warning-in-__vma_adjust.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-mmapc-remove-a-never-trigger-warning-in-__vma_adjust.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-mmapc-remove-a-never-trigger-warning-in-__vma_adjust.patch
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------------------------------------------------------
From: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx>
Subject: mm/mmap.c: remove a never-triggered warning in __vma_adjust()
The upper level of "if" makes sure (end >= next->vm_end), which means
there are only two possibilities:
1) end == next->vm_end
2) end > next->vm_end
remove_next is assigned to be (1 + end > next->vm_end). This means if
remove_next is 1, end must equal to next->vm_end.
The VM_WARN_ON will never trigger.
Link: http://lkml.kernel.org/r/20190912063126.13250-1-richardw.yang@xxxxxxxxxxxxxxx
Signed-off-by: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mmap.c | 2 --
1 file changed, 2 deletions(-)
--- a/mm/mmap.c~mm-mmapc-remove-a-never-trigger-warning-in-__vma_adjust
+++ a/mm/mmap.c
@@ -769,8 +769,6 @@ int __vma_adjust(struct vm_area_struct *
remove_next = 1 + (end > next->vm_end);
VM_WARN_ON(remove_next == 2 &&
end != next->vm_next->vm_end);
- VM_WARN_ON(remove_next == 1 &&
- end != next->vm_end);
/* trim end to next, for case 6 first pass */
end = next->vm_end;
}
_
Patches currently in -mm which might be from richardw.yang@xxxxxxxxxxxxxxx are
mm-fix-typo-in-the-comment-when-calling-function-__setpageuptodate.patch
mm-mmapc-remove-a-never-trigger-warning-in-__vma_adjust.patch
userfaultfd-use-vma_pagesize-for-all-huge-page-size-calculation.patch
userfaultfd-remove-unnecessary-warn_on-in-__mcopy_atomic_hugetlb.patch
userfaultfd-wrap-the-common-dst_vma-check-into-an-inlined-function.patch
