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sh: Kill off dcache writeback from copy_page().

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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>
This commit is contained in:
Paul Mundt 2009-09-08 16:23:08 +09:00
parent 6e4154d4c2
commit a2494b9b5f
1 changed files with 3 additions and 8 deletions
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11
arch/sh/lib/copy_page.S
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@ -30,7 +30,9 @@ ENTRY(copy_page)
mov r4,r10 mov r4,r10
mov r5,r11 mov r5,r11
mov r5,r8 mov r5,r8
mov.l .Lpsz,r0 mov #(PAGE_SIZE >> 10), r0
shll8 r0
shll2 r0
add r0,r8 add r0,r8
! !
1: mov.l @r11+,r0 1: mov.l @r11+,r0
@ -43,7 +45,6 @@ ENTRY(copy_page)
mov.l @r11+,r7 mov.l @r11+,r7
#if defined(CONFIG_CPU_SH4) #if defined(CONFIG_CPU_SH4)
movca.l r0,@r10 movca.l r0,@r10
mov r10,r0
#else #else
mov.l r0,@r10 mov.l r0,@r10
#endif #endif
@ -55,9 +56,6 @@ ENTRY(copy_page)
mov.l r3,@-r10 mov.l r3,@-r10
mov.l r2,@-r10 mov.l r2,@-r10
mov.l r1,@-r10 mov.l r1,@-r10
#if defined(CONFIG_CPU_SH4)
ocbwb @r0
#endif
cmp/eq r11,r8 cmp/eq r11,r8
bf/s 1b bf/s 1b
add #28,r10 add #28,r10
@ -68,9 +66,6 @@ ENTRY(copy_page)
rts rts
nop nop
.balign 4
.Lpsz: .long PAGE_SIZE
/* /*
* __kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n); * __kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);
* Return the number of bytes NOT copied * Return the number of bytes NOT copied