tree 07a442e66c3f608e174edd3b8a2fd154f4219380
parent 71e3aac0724ffe8918992d76acfe3aad7d8724a5
author Hugh Dickins <hughd@google.com> 1294962412 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> 1294968762 -0800

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>