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| Started by | Andy Lutomirski <luto@kernel.org> |
|---|---|
| First post | 2015-06-18 21:20 +0200 |
| Last post | 2015-06-18 21:20 +0200 |
| Articles | 1 — 1 participant |
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[PATCH v2 11/14] x86/asm/entry/64: Simplify irq stack pt_regs handling Andy Lutomirski <luto@kernel.org> - 2015-06-18 21:20 +0200
| From | Andy Lutomirski <luto@kernel.org> |
|---|---|
| Date | 2015-06-18 21:20 +0200 |
| Subject | [PATCH v2 11/14] x86/asm/entry/64: Simplify irq stack pt_regs handling |
| Message-ID | <pCNvY-Pk-27@gated-at.bofh.it> |
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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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