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| author | Jan Beulich <JBeulich@suse.com> | 2012-01-05 20:12:25 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2012-01-06 15:25:37 +0400 |
| commit | 426932909093e4e7729777a0e2beed4b54911361 (patch) | |
| tree | 5954055c0cf009ddd0bb5e8c3079406d2ca4a804 /arch/x86/lib/copy_page_64.S | |
| parent | ceb7b40b65539a771d1bfaf47660ac0ee57e0c4f (diff) | |
| download | linux-426932909093e4e7729777a0e2beed4b54911361.tar.xz | |
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/copy_page_64.S')
| -rw-r--r-- | arch/x86/lib/copy_page_64.S | 12 |
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 |