[PATCH -V3 16/25] mm/THP: withdraw the pgtable after pmdp related operations
From: Aneesh Kumar K.V <hidden>
Date: 2013-03-15 09:43:28
Subsystem:
memory management, memory management - thp (transparent huge page), the rest · Maintainers:
Andrew Morton, David Hildenbrand, Linus Torvalds
From: "Aneesh Kumar K.V" <redacted> 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. Cc: Andrea Arcangeli <redacted> Signed-off-by: Aneesh Kumar K.V <redacted> --- mm/huge_memory.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index e91b763..5c7cd7d 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c@@ -1380,9 +1380,10 @@ 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); + 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);
--
1.7.10