sh: update_mmu_cache() consolidation.

This splits out a separate __update_cache()/__update_tlb() for
update_mmu_cache() to wrap in to. This lets us share the common
__update_cache() bits while keeping special __update_tlb() handling
broken out.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 21 insertions, 0 deletions

diff --git a/arch/sh/mm/pg-mmu.c b/arch/sh/mm/pg-mmu.c
index 356d2cdcb209..8602f68af4c8 100644
--- a/arch/sh/mm/pg-mmu.c
+++ b/arch/sh/mm/pg-mmu.c
@@ -134,3 +134,24 @@ void clear_user_highpage(struct page *page, unsigned long vaddr)
         kunmap_atomic(kaddr, KM_USER0);
 }
 EXPORT_SYMBOL(clear_user_highpage);
+
+void __update_cache(struct vm_area_struct *vma,
+                    unsigned long address, pte_t pte)
+{
+        struct page *page;
+        unsigned long pfn = pte_pfn(pte);
+
+        if (!boot_cpu_data.dcache.n_aliases)
+                return;
+
+        page = pfn_to_page(pfn);
+        if (pfn_valid(pfn) && page_mapping(page)) {
+                int dirty = test_and_clear_bit(PG_dcache_dirty, &page->flags);
+                if (dirty) {
+                        unsigned long addr = (unsigned long)page_address(page);
+
+                        if (pages_do_alias(addr, address & PAGE_MASK))
+                                __flush_wback_region((void *)addr, PAGE_SIZE);
+                }
+        }
+}