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Commit 149728e9 authored by Anshuman Khandual's avatar Anshuman Khandual Committed by Linus Torvalds
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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@linux.vnet.ibm.com


Signed-off-by: default avatarAnshuman Khandual <khandual@linux.vnet.ibm.com>
Suggested-by: default avatarVlastimil Babka <vbabka@suse.cz>
Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b6b1fd2a

mm/mempolicy.c

+0 −5
Original line number Diff line number Diff line
@@ -2233,17 +2233,12 @@ int mpol_misplaced(struct page *page, struct vm_area_struct *vma, unsigned long 
	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);