summaryrefslogtreecommitdiffstats
path: root/arch
diff options
context:
space:
mode:
authorAndy Lutomirski <luto@kernel.org>2015-07-15 10:29:39 -0700
committerIngo Molnar <mingo@kernel.org>2015-07-17 12:50:13 +0200
commit23a781e987f05029c4a99a5c145be3efa6eda9f3 (patch)
tree8f80cdb789b0e91a43ffec89f52a8f1711758b17 /arch
parent810bc075f78ff2c221536eb3008eac6a492dba2d (diff)
downloadlinux-23a781e987f05029c4a99a5c145be3efa6eda9f3.tar.bz2
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/entry/entry_64.S3
1 files changed, 1 insertions, 2 deletions
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