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x86/irq_work: Make it depend on APIC 

The irq work interrupt vector is only installed when CONFIG_X86_LOCAL_APIC is
enabled, but the interrupt handler is compiled in unconditionally.

Compile the cruft out when the APIC is disabled.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20170828064957.691909010@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Thomas Gleixner 2017-08-28 08:47:35 +02:00 committed by Ingo Molnar
parent 0428e01a2f
commit a45525b5b4
2 changed files with 10 additions and 2 deletions
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8
arch/x86/include/asm/irq_work.h
View File

@ -3,9 +3,17 @@
#include <asm/cpufeature.h>
#ifdef CONFIG_X86_LOCAL_APIC
static inline bool arch_irq_work_has_interrupt(void)
{
return boot_cpu_has(X86_FEATURE_APIC);
}
extern void arch_irq_work_raise(void);
#else
static inline bool arch_irq_work_has_interrupt(void)
{
return false;
}
#endif
#endif /* _ASM_IRQ_WORK_H */

4
arch/x86/kernel/irq_work.c
View File

@ -11,6 +11,7 @@
#include <asm/trace/irq_vectors.h>
#include <linux/interrupt.h>
#ifdef CONFIG_X86_LOCAL_APIC
__visible void __irq_entry smp_irq_work_interrupt(struct pt_regs *regs)
{
ipi_entering_ack_irq();
@ -23,11 +24,10 @@ __visible void __irq_entry smp_irq_work_interrupt(struct pt_regs *regs)
void arch_irq_work_raise(void)
{
#ifdef CONFIG_X86_LOCAL_APIC
if (!arch_irq_work_has_interrupt())
return;
apic->send_IPI_self(IRQ_WORK_VECTOR);
apic_wait_icr_idle();
#endif
}
#endif