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authorJan Beulich <JBeulich@suse.com>2012-01-05 16:12:25 +0000
committerIngo Molnar <mingo@elte.hu>2012-01-06 12:25:37 +0100
commit426932909093e4e7729777a0e2beed4b54911361 (patch)
tree5954055c0cf009ddd0bb5e8c3079406d2ca4a804 /arch/x86/lib
parentceb7b40b65539a771d1bfaf47660ac0ee57e0c4f (diff)
downloadblackbird-op-linux-426932909093e4e7729777a0e2beed4b54911361.tar.gz
blackbird-op-linux-426932909093e4e7729777a0e2beed4b54911361.zip
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>
Diffstat (limited to 'arch/x86/lib')
-rw-r--r--arch/x86/lib/copy_page_64.S12
1 files changed, 4 insertions, 8 deletions
diff --git a/arch/x86/lib/copy_page_64.S b/arch/x86/lib/copy_page_64.S
index 01c805ba5359..6b34d04d096a 100644
--- a/arch/x86/lib/copy_page_64.S
+++ b/arch/x86/lib/copy_page_64.S
@@ -20,14 +20,12 @@ ENDPROC(copy_page_c)
ENTRY(copy_page)
CFI_STARTPROC
- subq $3*8,%rsp
- CFI_ADJUST_CFA_OFFSET 3*8
+ subq $2*8,%rsp
+ CFI_ADJUST_CFA_OFFSET 2*8
movq %rbx,(%rsp)
CFI_REL_OFFSET rbx, 0
movq %r12,1*8(%rsp)
CFI_REL_OFFSET r12, 1*8
- movq %r13,2*8(%rsp)
- CFI_REL_OFFSET r13, 2*8
movl $(4096/64)-5,%ecx
.p2align 4
@@ -91,10 +89,8 @@ ENTRY(copy_page)
CFI_RESTORE rbx
movq 1*8(%rsp),%r12
CFI_RESTORE r12
- movq 2*8(%rsp),%r13
- CFI_RESTORE r13
- addq $3*8,%rsp
- CFI_ADJUST_CFA_OFFSET -3*8
+ addq $2*8,%rsp
+ CFI_ADJUST_CFA_OFFSET -2*8
ret
.Lcopy_page_end:
CFI_ENDPROC
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