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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>
This commit is contained in:
Andy Lutomirski 2015-07-15 10:29:39 -07:00 committed by Ingo Molnar
parent 810bc075f7
commit 23a781e987
1 changed files with 1 additions and 2 deletions
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arch/x86/entry/entry_64.S
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@ -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