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>

diff --git a/arch/sh/lib/copy_page.S b/arch/sh/lib/copy_page.S
index 43de7e8..9d7b8bc 100644 (file)
--- 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