Commit 23a781e9 authored Jul 15, 2015 by Andy Lutomirski Committed by Ingo Molnar Jul 17, 2015

x86/nmi/64: Minor asm simplification



Replace LEA; MOV with an equivalent SUB.  This saves one
instruction.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent 810bc075

arch/x86/entry/entry_64.S

+1 −2

Original line number	Diff line number	Diff line
		@@ -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