The patch titled
Subject: mm/mempolicy.c: remove BUG_ON() checks for VMA inside mpol_misplaced()
has been added to the -mm tree. Its filename is
mm-mempolicy-remove-bug_on-checks-for-vma-inside-mpol_misplaced.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-mempolicy-remove-bug_on-checks-for-vma-inside-mpol_misplaced.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-mempolicy-remove-bug_on-checks-for-vma-inside-mpol_misplaced.patch
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------------------------------------------------------
From: Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx>
Subject: mm/mempolicy.c: remove BUG_ON() checks for VMA inside mpol_misplaced()
VMA and its address bounds checks are too late in this function. They
must have been verified earlier in the page fault sequence. Hence just
remove them.
Link: http://lkml.kernel.org/r/20170901130137.7617-1-khandual@xxxxxxxxxxxxxxxxxx
Signed-off-by: Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx>
Suggested-by: Vlastimil Babka <vbabka@xxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mempolicy.c | 5 -----
1 file changed, 5 deletions(-)
diff -puN mm/mempolicy.c~mm-mempolicy-remove-bug_on-checks-for-vma-inside-mpol_misplaced mm/mempolicy.c
--- a/mm/mempolicy.c~mm-mempolicy-remove-bug_on-checks-for-vma-inside-mpol_misplaced
+++ a/mm/mempolicy.c
@@ -2233,17 +2233,12 @@ int mpol_misplaced(struct page *page, st
int polnid = -1;
int ret = -1;
- BUG_ON(!vma);
-
pol = get_vma_policy(vma, addr);
if (!(pol->flags & MPOL_F_MOF))
goto out;
switch (pol->mode) {
case MPOL_INTERLEAVE:
- BUG_ON(addr >= vma->vm_end);
- BUG_ON(addr < vma->vm_start);
-
pgoff = vma->vm_pgoff;
pgoff += (addr - vma->vm_start) >> PAGE_SHIFT;
polnid = offset_il_node(pol, pgoff);
_
Patches currently in -mm which might be from khandual@xxxxxxxxxxxxxxxxxx are
mm-page_fault-remove-reduntant-check-for-write-access.patch
mm-mempolicy-remove-bug_on-checks-for-vma-inside-mpol_misplaced.patch
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