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| author | Vineet Gupta <vgupta@synopsys.com> | 2013-05-19 12:21:03 +0200 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2013-06-22 15:53:18 +0200 |
| commit | 29b93c68bf81d2aad1030e989d844cff9f3ba99a (patch) | |
| tree | 2bd558302a88ad54c3a35311f73cadd1ed8467bc /arch/arc | |
| parent | ARC: make dcache VIPT aliasing support dependant on dcache (diff) | |
| download | linux-29b93c68bf81d2aad1030e989d844cff9f3ba99a.tar.xz linux-29b93c68bf81d2aad1030e989d844cff9f3ba99a.zip | |
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.c | 6 |
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) { |