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OpenCloudOS-Kernel
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ARC: [mm] Zero page optimization 

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2013-05-19 15:51:03 +05:30
parent 2f9e99618f
commit 29b93c68bf
1 changed files with 5 additions and 1 deletions
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6
arch/arc/mm/tlb.c
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@ -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) {