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authorRik van Riel <riel@redhat.com>2014-04-07 15:36:55 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-07 16:35:49 -0700
commit88a9ab6e3dfb5b10168130c255c6102c925343ab (patch)
treea1b496cb69f682a60f9add8c6ffbfc91d415cc1c
parenta9af0c5dfdaf0b2e1a8bab7fbf6f29138947d534 (diff)
downloadlinux-88a9ab6e3dfb5b10168130c255c6102c925343ab.tar.bz2
mm,numa: reorganize change_pmd_range()
Reorganize the order of ifs in change_pmd_range a little, in preparation for the next patch. [akpm@linux-foundation.org: fix indenting, per David] Signed-off-by: Rik van Riel <riel@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Andrea Arcangeli <aarcange@redhat.com> Reported-by: Xing Gang <gang.xing@hp.com> Tested-by: Chegu Vinod <chegu_vinod@hp.com> Acked-by: David Rientjes <rientjes@google.com> Cc: Sasha Levin <sasha.levin@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/mprotect.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/mm/mprotect.c b/mm/mprotect.c
index 769a67a15803..79cb51866e02 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -118,6 +118,8 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma,
unsigned long this_pages;
next = pmd_addr_end(addr, end);
+ if (!pmd_trans_huge(*pmd) && pmd_none_or_clear_bad(pmd))
+ continue;
if (pmd_trans_huge(*pmd)) {
if (next - addr != HPAGE_PMD_SIZE)
split_huge_page_pmd(vma, addr, pmd);
@@ -133,10 +135,9 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma,
continue;
}
}
- /* fall through */
+ /* fall through, the trans huge pmd just split */
}
- if (pmd_none_or_clear_bad(pmd))
- continue;
+ VM_BUG_ON(pmd_trans_huge(*pmd));
this_pages = change_pte_range(vma, pmd, addr, next, newprot,
dirty_accountable, prot_numa);
pages += this_pages;