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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2013-06-05 17:14:04 -0700
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-06-20 16:55:07 +1000
commita6bf2bb03e5bad7e9289d80ecb5faac11630c7ab (patch)
tree48cd9fb8de2bc5e0fe66e7e67205efe8ab47d78e
parent6b0b50b0617fad5f2af3b928596a25f7de8dbf50 (diff)
downloadop-kernel-dev-a6bf2bb03e5bad7e9289d80ecb5faac11630c7ab.zip
op-kernel-dev-a6bf2bb03e5bad7e9289d80ecb5faac11630c7ab.tar.gz
mm/THP: withdraw the pgtable after pmdp related operations
For architectures like ppc64 we look at deposited pgtable when calling pmdp_get_and_clear. So do the pgtable_trans_huge_withdraw after finishing pmdp related operations. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Reviewed-by: Andrea Arcangeli <aarcange@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: David Gibson <david@gibson.dropbear.id.au> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
-rw-r--r--mm/huge_memory.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 6b785e1..5c4fac2 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1360,9 +1360,15 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
struct page *page;
pgtable_t pgtable;
pmd_t orig_pmd;
- pgtable = pgtable_trans_huge_withdraw(tlb->mm, pmd);
+ /*
+ * For architectures like ppc64 we look at deposited pgtable
+ * when calling pmdp_get_and_clear. So do the
+ * pgtable_trans_huge_withdraw after finishing pmdp related
+ * operations.
+ */
orig_pmd = pmdp_get_and_clear(tlb->mm, addr, pmd);
tlb_remove_pmd_tlb_entry(tlb, pmd, addr);
+ pgtable = pgtable_trans_huge_withdraw(tlb->mm, pmd);
if (is_huge_zero_pmd(orig_pmd)) {
tlb->mm->nr_ptes--;
spin_unlock(&tlb->mm->page_table_lock);
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