From: Andy Lutomirski Date: Wed, 15 Jul 2015 17:29:39 +0000 (-0700) Subject: x86/nmi/64: Minor asm simplification X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=23a781e987f05029c4a99a5c145be3efa6eda9f3;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git x86/nmi/64: Minor asm simplification Replace LEA; MOV with an equivalent SUB. This saves one instruction. Signed-off-by: Andy Lutomirski Reviewed-by: Steven Rostedt Cc: Borislav Petkov Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Signed-off-by: Ingo Molnar --- diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index d8ab2b201fa1..0fb52526e452 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -1420,8 +1420,7 @@ nested_nmi: * Modify the "iret" frame to point to repeat_nmi, forcing another * iteration of NMI handling. */ - leaq -1*8(%rsp), %rdx - movq %rdx, %rsp + subq $8, %rsp leaq -10*8(%rsp), %rdx pushq $__KERNEL_DS pushq %rdx