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| author | Hugh Dickins <hughd@google.com> | 2011-01-13 15:46:52 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-13 17:32:42 -0800 |
| commit | 8a07651ee8cdaa9e27cb4ae372aed347533770f5 (patch) | |
| tree | 07a442e66c3f608e174edd3b8a2fd154f4219380 | |
| parent | 71e3aac0724ffe8918992d76acfe3aad7d8724a5 (diff) | |
| download | op-kernel-dev-8a07651ee8cdaa9e27cb4ae372aed347533770f5.zip op-kernel-dev-8a07651ee8cdaa9e27cb4ae372aed347533770f5.tar.gz | |
thp: transparent hugepage core fixlet
If you configure THP in addition to HUGETLB_PAGE on x86_32 without PAE,
the p?d-folding works out that munlock_vma_pages_range() can crash to
follow_page()'s pud_huge() BUG_ON(flags & FOLL_GET): it needs the same
VM_HUGETLB check already there on the pmd_huge() line. Conveniently,
openSUSE provides a "blogd" which tests this out at startup!
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/memory.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/memory.c b/mm/memory.c index c50a195..840ce9d 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1288,7 +1288,7 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address, pud = pud_offset(pgd, address); if (pud_none(*pud)) goto no_page_table; - if (pud_huge(*pud)) { + if (pud_huge(*pud) && vma->vm_flags & VM_HUGETLB) { BUG_ON(flags & FOLL_GET); page = follow_huge_pud(mm, address, pud, flags & FOLL_WRITE); goto out; |
