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| author | Andy Lutomirski <luto@kernel.org> | 2015-07-15 10:29:39 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-07-17 12:50:13 +0200 |
| commit | 23a781e987f05029c4a99a5c145be3efa6eda9f3 (patch) | |
| tree | 8f80cdb789b0e91a43ffec89f52a8f1711758b17 /arch/x86/entry | |
| parent | 810bc075f78ff2c221536eb3008eac6a492dba2d (diff) | |
| download | lwn-23a781e987f05029c4a99a5c145be3efa6eda9f3.tar.gz lwn-23a781e987f05029c4a99a5c145be3efa6eda9f3.zip | |
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/x86/entry')
| -rw-r--r-- | arch/x86/entry/entry_64.S | 3 |
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 |