Messages in this thread Patch in this message | | | Date | Thu, 05 Jan 2012 16:12:25 +0000 | From | "Jan Beulich" <> | Subject | [PATCH] x86-64: slightly shorten copy_page() |
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%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>
--- arch/x86/lib/copy_page_64.S | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-)
--- 3.2/arch/x86/lib/copy_page_64.S +++ 3.2-x86_64-copy_page/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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