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authorAndrea Arcangeli <aarcange@redhat.com>2011-01-13 15:46:55 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-13 17:32:42 -0800
commit500d65d471018d9a13b0d51b7e141ed2a3555c1d (patch)
tree046dc2337f87a1a365fde126fab7f4ac9ae82793 /mm/memory.c
parent0af4e98b6b095c74588af04872f83d333c958c32 (diff)
downloadlinux-500d65d471018d9a13b0d51b7e141ed2a3555c1d.tar.bz2
thp: pmd_trans_huge migrate bugcheck
No pmd_trans_huge should ever materialize in migration ptes areas, because we split the hugepage before migration ptes are instantiated. Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Acked-by: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory.c')
-rw-r--r--mm/memory.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c
index c1a80e00458d..12ee1ea237f5 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1305,6 +1305,10 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
goto out;
}
if (pmd_trans_huge(*pmd)) {
+ if (flags & FOLL_SPLIT) {
+ split_huge_page_pmd(mm, pmd);
+ goto split_fallthrough;
+ }
spin_lock(&mm->page_table_lock);
if (likely(pmd_trans_huge(*pmd))) {
if (unlikely(pmd_trans_splitting(*pmd))) {
@@ -1320,6 +1324,7 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
spin_unlock(&mm->page_table_lock);
/* fall through */
}
+split_fallthrough:
if (unlikely(pmd_bad(*pmd)))
goto no_page_table;