mm/THP: use pmd_populate() to update the pmd with pgtable_t pointer
authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Fri, 24 May 2013 22:55:21 +0000 (15:55 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 7 Jun 2013 19:49:29 +0000 (12:49 -0700)
commit6092ad5bbc7631f60be754f5013533c909eca733
tree28814f5f27be2ddae945951a5aa52bf6bb77c2a1
parentc8a097fd8d73584d7c1577e0aee41c2a177394f7
mm/THP: use pmd_populate() to update the pmd with pgtable_t pointer

commit 7c3425123ddfdc5f48e7913ff59d908789712b18 upstream.

We should not use set_pmd_at to update pmd_t with pgtable_t pointer.
set_pmd_at is used to set pmd with huge pte entries and architectures
like ppc64, clear few flags from the pte when saving a new entry.
Without this change we observe bad pte errors like below on ppc64 with
THP enabled.

  BUG: Bad page map in process ld mm=0xc000001ee39f4780 pte:7fc3f37848000001 pmd:c000001ec0000000

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
mm/huge_memory.c