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authorVineet Gupta <vgupta@synopsys.com>2013-05-19 15:51:03 +0530
committerVineet Gupta <vgupta@synopsys.com>2013-06-22 19:23:18 +0530
commit29b93c68bf81d2aad1030e989d844cff9f3ba99a (patch)
tree2bd558302a88ad54c3a35311f73cadd1ed8467bc /arch/arc
parent2f9e99618f5c858b769fa4455adaa6a4aef9bafd (diff)
ARC: [mm] Zero page optimization
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc')
-rw-r--r--arch/arc/mm/tlb.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/arc/mm/tlb.c b/arch/arc/mm/tlb.c
index f60807c2683d..1c91dbc8ddd8 100644
--- a/arch/arc/mm/tlb.c
+++ b/arch/arc/mm/tlb.c
@@ -433,9 +433,14 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long vaddr_unaligned,
{
unsigned long vaddr = vaddr_unaligned & PAGE_MASK;
unsigned long paddr = pte_val(*ptep) & PAGE_MASK;
+ struct page *page = pfn_to_page(pte_pfn(*ptep));
create_tlb(vma, vaddr, ptep);
+ if (page == ZERO_PAGE(0)) {
+ return;
+ }
+
/*
* Exec page : Independent of aliasing/page-color considerations,
* since icache doesn't snoop dcache on ARC, any dirty
@@ -447,7 +452,6 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long vaddr_unaligned,
*/
if ((vma->vm_flags & VM_EXEC) ||
addr_not_cache_congruent(paddr, vaddr)) {
- struct page *page = pfn_to_page(pte_pfn(*ptep));
int dirty = test_and_clear_bit(PG_arch_1, &page->flags);
if (dirty) {