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Commit 42693290 authored Jan 05, 2012 by Jan Beulich Committed by Ingo Molnar Jan 06, 2012

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>

parent ceb7b40b

arch/x86/lib/copy_page_64.S

+4 −8

Original line number	Original line	Diff line number	Diff line
	@@ -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