x86/asm/entry/64: Simplify IRQ stack pt_regs handling
There's no need for both RSI and RDI to point to the original stack. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Denys Vlasenko <vda.linux@googlemail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: paulmck@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/3a0481f809dd340c7d3f54ce3fd6d66ef2a578cd.1435952415.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -506,8 +506,6 @@ END(irq_entries_start)
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SAVE_C_REGS
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SAVE_EXTRA_REGS
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movq %rsp,%rdi /* arg1 for \func (pointer to pt_regs) */
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testb $3, CS(%rsp)
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jz 1f
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SWAPGS
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@ -519,14 +517,14 @@ END(irq_entries_start)
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* a little cheaper to use a separate counter in the PDA (short of
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* moving irq_enter into assembly, which would be too much work)
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*/
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movq %rsp, %rsi
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movq %rsp, %rdi
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incl PER_CPU_VAR(irq_count)
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cmovzq PER_CPU_VAR(irq_stack_ptr), %rsp
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pushq %rsi
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pushq %rdi
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/* We entered an interrupt context - irqs are off: */
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TRACE_IRQS_OFF
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call \func
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call \func /* rdi points to pt_regs */
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.endm
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/*
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