Messages in this thread Patch in this message | | | From | Andy Lutomirski <> | Subject | [RFC/INCOMPLETE 11/13] x86/asm/entry/64: Simplify irq stack pt_regs handling | Date | Tue, 16 Jun 2015 13:16:57 -0700 |
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There's no need for both rsi and rdi to point to the original stack.
Signed-off-by: Andy Lutomirski <luto@kernel.org> --- arch/x86/entry/entry_64.S | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 43bf5762443c..ab8cbf602d19 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -505,8 +505,6 @@ END(irq_entries_start) SAVE_C_REGS SAVE_EXTRA_REGS - movq %rsp,%rdi /* arg1 for \func (pointer to pt_regs) */ - testb $3, CS(%rsp) jz 1f SWAPGS @@ -518,14 +516,14 @@ END(irq_entries_start) * a little cheaper to use a separate counter in the PDA (short of * moving irq_enter into assembly, which would be too much work) */ - movq %rsp, %rsi + movq %rsp, %rdi incl PER_CPU_VAR(irq_count) cmovzq PER_CPU_VAR(irq_stack_ptr), %rsp - pushq %rsi + pushq %rdi /* We entered an interrupt context - irqs are off: */ TRACE_IRQS_OFF - call \func + call \func /* rdi points to pt_regs */ .endm /* -- 2.4.3
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