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Commit 7a591cfe authored by David S. Miller's avatar David S. Miller
Browse files

[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: default avatarDavid S. Miller <davem@davemloft.net>
parent 2a3a5f5d

arch/sparc64/mm/init.c

+28 −22
Original line number Diff line number Diff line
@@ -188,8 +188,9 @@ atomic_t dcpage_flushes_xcall = ATOMIC_INIT(0); 
#endif

#endif



__inline__ void flush_dcache_page_impl(struct page *page)

inline void flush_dcache_page_impl(struct page *page)

{

	BUG_ON(tlb_type == hypervisor);

#ifdef CONFIG_DEBUG_DCFLUSH

	atomic_inc(&dcpage_flushes);

#endif
@@ -279,11 +280,12 @@ unsigned long _PAGE_SZBITS __read_mostly; 
void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)

{

	struct mm_struct *mm;

	struct page *page;

	unsigned long pfn;



	if (tlb_type != hypervisor) {

		unsigned long pfn = pte_pfn(pte);

		unsigned long pg_flags;

		struct page *page;



	pfn = pte_pfn(pte);

		if (pfn_valid(pfn) &&

		    (page = pfn_to_page(pfn), page_mapping(page)) &&

		    ((pg_flags = page->flags) & (1UL << PG_dcache_dirty))) {
@@ -303,6 +305,7 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t p 


			put_cpu();

		}

	}



	mm = vma->vm_mm;

	if ((pte_val(pte) & _PAGE_ALL_SZ_BITS) == _PAGE_SZBITS) {
@@ -321,6 +324,9 @@ void flush_dcache_page(struct page *page) 
	struct address_space *mapping;

	int this_cpu;



	if (tlb_type == hypervisor)

		return;



	/* Do not bother with the expensive D-cache flush if it

	 * is merely the zero page.  The 'bigcore' testcase in GDB

	 * causes this case to run millions of times.

arch/sparc64/mm/tlb.c

+2 −1
Original line number Diff line number Diff line
@@ -49,7 +49,8 @@ void tlb_batch_add(struct mm_struct *mm, unsigned long vaddr, pte_t *ptep, pte_t 
	if (pte_exec(orig))

		vaddr |= 0x1UL;



	if (pte_dirty(orig)) {

	if (tlb_type != hypervisor &&

	    pte_dirty(orig)) {

		unsigned long paddr, pfn = pte_pfn(orig);

		struct address_space *mapping;

		struct page *page;