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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2013-05-24 15:55:21 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-06-07 12:46:37 -0700
commit2f28357cd8f0be2c507d3a7d6f79c0cca0d7f9ce (patch)
tree0154209c10d4f6d0f32b09cd62226227633e2e09
parent77809457d14ff89ac8e67f3cdf45a43b2b620f82 (diff)
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>
-rw-r--r--mm/huge_memory.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index a9ab45ec7d5e..983d2e116da7 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1893,7 +1893,12 @@ static void collapse_huge_page(struct mm_struct *mm,
pte_unmap(pte);
spin_lock(&mm->page_table_lock);
BUG_ON(!pmd_none(*pmd));
- set_pmd_at(mm, address, pmd, _pmd);
+ /*
+ * We can only use set_pmd_at when establishing
+ * hugepmds and never for establishing regular pmds that
+ * points to regular pagetables. Use pmd_populate for that
+ */
+ pmd_populate(mm, pmd, pmd_pgtable(_pmd));
spin_unlock(&mm->page_table_lock);
anon_vma_unlock(vma->anon_vma);
goto out;