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authorAndrea Arcangeli <aarcange@redhat.com>2011-01-14 02:46:55 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-14 04:32:42 +0300
commit500d65d471018d9a13b0d51b7e141ed2a3555c1d (patch)
tree046dc2337f87a1a365fde126fab7f4ac9ae82793 /include
parent0af4e98b6b095c74588af04872f83d333c958c32 (diff)
downloadlinux-500d65d471018d9a13b0d51b7e141ed2a3555c1d.tar.xz
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 'include')
-rw-r--r--include/linux/mm.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 78adec4ba9f4..2ec5138badab 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1490,6 +1490,7 @@ struct page *follow_page(struct vm_area_struct *, unsigned long address,
#define FOLL_DUMP 0x08 /* give error on hole if it would be zero */
#define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */
#define FOLL_MLOCK 0x40 /* mark page as mlocked */
+#define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */
typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
void *data);