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602447f954
Nadav reported that since the this_cpu_*() ops got asm-volatile constraints on, code generation suffered for do_IRQ(), but since this is all with IRQs disabled we can use __this_cpu_*(). smp_x86_platform_ipi 234 222 -12,+0 smp_kvm_posted_intr_ipi 74 66 -8,+0 smp_kvm_posted_intr_wakeup_ipi 86 78 -8,+0 smp_apic_timer_interrupt 292 284 -8,+0 smp_kvm_posted_intr_nested_ipi 74 66 -8,+0 do_IRQ 195 187 -8,+0 Reported-by: Nadav Amit <nadav.amit@gmail.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> 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>
33 lines
683 B
C
33 lines
683 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Per-cpu current frame pointer - the location of the last exception frame on
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* the stack, stored in the per-cpu area.
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*
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* Jeremy Fitzhardinge <jeremy@goop.org>
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*/
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#ifndef _ASM_X86_IRQ_REGS_H
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#define _ASM_X86_IRQ_REGS_H
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#include <asm/percpu.h>
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#define ARCH_HAS_OWN_IRQ_REGS
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DECLARE_PER_CPU(struct pt_regs *, irq_regs);
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static inline struct pt_regs *get_irq_regs(void)
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{
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return __this_cpu_read(irq_regs);
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}
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static inline struct pt_regs *set_irq_regs(struct pt_regs *new_regs)
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{
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struct pt_regs *old_regs;
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old_regs = get_irq_regs();
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__this_cpu_write(irq_regs, new_regs);
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return old_regs;
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}
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#endif /* _ASM_X86_IRQ_REGS_32_H */
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