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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 /mm/migrate.c
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 'mm/migrate.c')
-rw-r--r--mm/migrate.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index 690d0de993af..1a531b760b3b 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -113,6 +113,8 @@ static int remove_migration_pte(struct page *new, struct vm_area_struct *vma,
goto out;
pmd = pmd_offset(pud, addr);
+ if (pmd_trans_huge(*pmd))
+ goto out;
if (!pmd_present(*pmd))
goto out;
@@ -632,6 +634,9 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private,
/* page was freed from under us. So we are done. */
goto move_newpage;
}
+ if (unlikely(PageTransHuge(page)))
+ if (unlikely(split_huge_page(page)))
+ goto move_newpage;
/* prepare cgroup just returns 0 or -ENOMEM */
rc = -EAGAIN;
@@ -1063,7 +1068,7 @@ static int do_move_page_to_node_array(struct mm_struct *mm,
if (!vma || pp->addr < vma->vm_start || !vma_migratable(vma))
goto set_status;
- page = follow_page(vma, pp->addr, FOLL_GET);
+ page = follow_page(vma, pp->addr, FOLL_GET|FOLL_SPLIT);
err = PTR_ERR(page);
if (IS_ERR(page))