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Commit a2494b9b authored by Paul Mundt's avatar Paul Mundt
Browse files

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: default avatarPaul Mundt <lethal@linux-sh.org>
parent 6e4154d4

arch/sh/lib/copy_page.S

+3 −8
Original line number Original line Diff line number Diff line
@@ -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