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[SPARC64]: Avoid dcache-dirty page state management on sun4v.
It is totally wasted work, since we have no D-cache aliasing issues on sun4v. Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -188,8 +188,9 @@ atomic_t dcpage_flushes_xcall = ATOMIC_INIT(0);
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#endif
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#endif
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__inline__ void flush_dcache_page_impl(struct page *page)
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inline void flush_dcache_page_impl(struct page *page)
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{
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BUG_ON(tlb_type == hypervisor);
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#ifdef CONFIG_DEBUG_DCFLUSH
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atomic_inc(&dcpage_flushes);
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#endif
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@ -279,11 +280,12 @@ unsigned long _PAGE_SZBITS __read_mostly;
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void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
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{
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struct mm_struct *mm;
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struct page *page;
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unsigned long pfn;
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unsigned long pg_flags;
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pfn = pte_pfn(pte);
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if (tlb_type != hypervisor) {
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unsigned long pfn = pte_pfn(pte);
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unsigned long pg_flags;
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struct page *page;
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if (pfn_valid(pfn) &&
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(page = pfn_to_page(pfn), page_mapping(page)) &&
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((pg_flags = page->flags) & (1UL << PG_dcache_dirty))) {
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@ -303,6 +305,7 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t p
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put_cpu();
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}
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}
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mm = vma->vm_mm;
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if ((pte_val(pte) & _PAGE_ALL_SZ_BITS) == _PAGE_SZBITS) {
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@ -321,6 +324,9 @@ void flush_dcache_page(struct page *page)
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struct address_space *mapping;
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int this_cpu;
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if (tlb_type == hypervisor)
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return;
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/* Do not bother with the expensive D-cache flush if it
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* is merely the zero page. The 'bigcore' testcase in GDB
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* causes this case to run millions of times.
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@ -49,7 +49,8 @@ void tlb_batch_add(struct mm_struct *mm, unsigned long vaddr, pte_t *ptep, pte_t
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if (pte_exec(orig))
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vaddr |= 0x1UL;
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if (pte_dirty(orig)) {
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if (tlb_type != hypervisor &&
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pte_dirty(orig)) {
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unsigned long paddr, pfn = pte_pfn(orig);
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struct address_space *mapping;
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struct page *page;
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