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mm: thp: avoid false positive VM_BUG_ON_PAGE in page_move_anon_rmap()

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If page_move_anon_rmap() is refiling a pmd-splitted THP mapped in a tail
page from a pte, the "address" must be THP aligned in order for the
page->index bugcheck to pass in the CONFIG_DEBUG_VM=y builds.

Link: http://lkml.kernel.org/r/1464253620-106404-1-git-send-email-kirill.shutemov@linux.intel.com
Fixes: 6d0a07edd1 ("mm: thp: calculate the mapcount correctly for THP pages during WP faults")
Signed-off-by: Kirill A. Shutemov <[email protected]>
Reported-by: Mika Westerberg <[email protected]>
Tested-by: Mika Westerberg <[email protected]>
Reviewed-by: Andrea Arcangeli <[email protected]>
Cc: <[email protected]>        [4.5]
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Kirill A. Shutemov authored and Linus Torvalds committed 2016-05-27 14:49:37 -07:00
1 parent e2fe14564d
commit 0798d3c022
1 file changed
+2
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mm/rmap.c
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@@ -1098,6 +1098,8 @@ void page_move_anon_rmap(struct page *page,
VM_BUG_ON_PAGE(!PageLocked(page), page);
VM_BUG_ON_VMA(!anon_vma, vma);
if (IS_ENABLED(CONFIG_DEBUG_VM) && PageTransHuge(page))
address &= HPAGE_PMD_MASK;
VM_BUG_ON_PAGE(page->index != linear_page_index(vma, address), page);
anon_vma = (void *) anon_vma + PAGE_MAPPING_ANON;