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| author | Andrea Arcangeli <aarcange@redhat.com> | 2011-01-13 15:46:55 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-13 17:32:42 -0800 |
| commit | 500d65d471018d9a13b0d51b7e141ed2a3555c1d (patch) | |
| tree | 046dc2337f87a1a365fde126fab7f4ac9ae82793 /mm/memory.c | |
| parent | 0af4e98b6b095c74588af04872f83d333c958c32 (diff) | |
| download | lwn-500d65d471018d9a13b0d51b7e141ed2a3555c1d.tar.gz lwn-500d65d471018d9a13b0d51b7e141ed2a3555c1d.zip | |
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.c | 5 |
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; |