sh: Kill off dcache writeback from copy_page().

Now that the cache purging is handled manually by all copy_page()
callers, we can kill off copy_page()'s on writeback. This optimizes the
non-aliasing case.

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

1 files changed, 3 insertions, 8 deletions

diff --git a/arch/sh/lib/copy_page.S b/arch/sh/lib/copy_page.S
index 43de7e8e4e17..9d7b8bc51866 100644
--- a/arch/sh/lib/copy_page.S
+++ b/arch/sh/lib/copy_page.S
@@ -30,7 +30,9 @@ ENTRY(copy_page)
         mov     r4,r10
         mov     r5,r11
         mov     r5,r8
-        mov.l   .Lpsz,r0
+        mov     #(PAGE_SIZE >> 10), r0
+        shll8   r0
+        shll2   r0
         add     r0,r8
         !
 1:      mov.l   @r11+,r0
@@ -43,7 +45,6 @@ ENTRY(copy_page)
         mov.l   @r11+,r7
 #if defined(CONFIG_CPU_SH4)
         movca.l r0,@r10
-        mov     r10,r0
 #else
         mov.l   r0,@r10
 #endif
@@ -55,9 +56,6 @@ ENTRY(copy_page)
         mov.l   r3,@-r10
         mov.l   r2,@-r10
         mov.l   r1,@-r10
-#if defined(CONFIG_CPU_SH4)
-        ocbwb   @r0
-#endif
         cmp/eq  r11,r8
         bf/s    1b
          add    #28,r10
@@ -68,9 +66,6 @@ ENTRY(copy_page)
         rts
          nop
 
-        .balign 4
-.Lpsz:  .long   PAGE_SIZE
-
 /*
  * __kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);
  * Return the number of bytes NOT copied