From fcbe08d66f57c368e77ca729dd01e6b539ffb3ff Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Fri, 24 Oct 2014 10:52:29 +0200 Subject: s390/mm: pmdp_get_and_clear_full optimization Analog to ptep_get_and_clear_full define a variant of the pmpd_get_and_clear primitive which gets the full hint from the mmu_gather struct. This allows s390 to avoid a costly instruction when destroying an address space. Signed-off-by: Martin Schwidefsky --- mm/huge_memory.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'mm/huge_memory.c') diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 7e9c15cb93a9..6a37f1b2ed1e 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1400,7 +1400,8 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, * pgtable_trans_huge_withdraw after finishing pmdp related * operations. */ - orig_pmd = pmdp_get_and_clear(tlb->mm, addr, pmd); + orig_pmd = pmdp_get_and_clear_full(tlb->mm, addr, pmd, + tlb->fullmm); tlb_remove_pmd_tlb_entry(tlb, pmd, addr); pgtable = pgtable_trans_huge_withdraw(tlb->mm, pmd); if (is_huge_zero_pmd(orig_pmd)) { -- cgit v1.2.3