sh: Optimized copy_{to,from}_user_page() for SH-4.

This moves copy_{to,from}_user_page() out-of-line on SH-4 and
converts for the kmap_coherent() API. Based on the MIPS
implementation.

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

1 files changed, 29 insertions, 23 deletions

diff --git a/arch/sh/mm/pg-sh4.c b/arch/sh/mm/pg-sh4.c
index ede6dd1e3701..8c7a9ca79879 100644
--- a/arch/sh/mm/pg-sh4.c
+++ b/arch/sh/mm/pg-sh4.c
@@ -52,33 +52,39 @@ static inline void kunmap_coherent(struct page *page)
 void clear_user_page(void *to, unsigned long address, struct page *page)
 {
         __set_bit(PG_mapped, &page->flags);
-        if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0)
-                clear_page(to);
-        else {
-                void *vto = kmap_coherent(page, address);
-                __clear_user_page(vto, to);
-                kunmap_coherent(vto);
-        }
+
+        clear_page(to);
+        if ((((address & PAGE_MASK) ^ (unsigned long)to) & CACHE_ALIAS))
+                __flush_wback_region(to, PAGE_SIZE);
 }
 
-/*
- * copy_user_page
- * @to: P1 address
- * @from: P1 address
- * @address: U0 address to be mapped
- * @page: page (virt_to_page(to))
- */
-void copy_user_page(void *to, void *from, unsigned long address,
-                    struct page *page)
+void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
+                       unsigned long vaddr, void *dst, const void *src,
+                       unsigned long len)
 {
+        void *vto;
+
         __set_bit(PG_mapped, &page->flags);
-        if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0)
-                copy_page(to, from);
-        else {
-                void *vfrom = kmap_coherent(page, address);
-                __copy_user_page(vfrom, from, to);
-                kunmap_coherent(vfrom);
-        }
+
+        vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
+        memcpy(vto, src, len);
+        kunmap_coherent(vto);
+
+        if (vma->vm_flags & VM_EXEC)
+                flush_cache_page(vma, vaddr, page_to_pfn(page));
+}
+
+void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
+                         unsigned long vaddr, void *dst, const void *src,
+                         unsigned long len)
+{
+        void *vfrom;
+
+        __set_bit(PG_mapped, &page->flags);
+
+        vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
+        memcpy(dst, vfrom, len);
+        kunmap_coherent(vfrom);
 }
 
 void copy_user_highpage(struct page *to, struct page *from,