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x86-64: Slightly shorten copy_page() 

%r13 got saved and restored without ever getting touched, so
there's no need to do so.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/4F05D9F9020000780006AA0D@nat28.tlf.novell.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jan Beulich 2012-01-05 16:12:25 +00:00 committed by Ingo Molnar
parent ceb7b40b65
commit 4269329090
1 changed files with 4 additions and 8 deletions
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12
arch/x86/lib/copy_page_64.S
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@ -20,14 +20,12 @@ ENDPROC(copy_page_c)
ENTRY(copy_page) ENTRY(copy_page)
CFI_STARTPROC CFI_STARTPROC
subq $3*8,%rsp subq $2*8,%rsp
CFI_ADJUST_CFA_OFFSET 3*8 CFI_ADJUST_CFA_OFFSET 2*8
movq %rbx,(%rsp) movq %rbx,(%rsp)
CFI_REL_OFFSET rbx, 0 CFI_REL_OFFSET rbx, 0
movq %r12,1*8(%rsp) movq %r12,1*8(%rsp)
CFI_REL_OFFSET r12, 1*8 CFI_REL_OFFSET r12, 1*8
movq %r13,2*8(%rsp)
CFI_REL_OFFSET r13, 2*8
movl $(4096/64)-5,%ecx movl $(4096/64)-5,%ecx
.p2align 4 .p2align 4
@ -91,10 +89,8 @@ ENTRY(copy_page)
CFI_RESTORE rbx CFI_RESTORE rbx
movq 1*8(%rsp),%r12 movq 1*8(%rsp),%r12
CFI_RESTORE r12 CFI_RESTORE r12
movq 2*8(%rsp),%r13 addq $2*8,%rsp
CFI_RESTORE r13 CFI_ADJUST_CFA_OFFSET -2*8
addq $3*8,%rsp
CFI_ADJUST_CFA_OFFSET -3*8
ret ret
.Lcopy_page_end: .Lcopy_page_end:
CFI_ENDPROC CFI_ENDPROC