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x86/apic: Provide and use helper for send_IPI_allbutself()

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To support IPI shorthands wrap invocations of apic->send_IPI_allbutself()
in a helper function, so the static key controlling the shorthand mode is
only in one place.

Fixup all callers.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20190722105220.492691679@linutronix.de
This commit is contained in:
Thomas Gleixner 2019-07-22 20:47:23 +02:00
parent 6a1cb5f5c6
commit 22ca7ee933
5 changed files with 18 additions and 9 deletions
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7
arch/x86/kernel/reboot.c
View file

@ -828,11 +828,6 @@ static int crash_nmi_callback(unsigned int val, struct pt_regs *regs)
return NMI_HANDLED;
}
static void smp_send_nmi_allbutself(void)
{
apic->send_IPI_allbutself(NMI_VECTOR);
}
/*
* Halt all other CPUs, calling the specified function on each of them
*
@ -861,7 +856,7 @@ void nmi_shootdown_cpus(nmi_shootdown_cb callback)
*/
wmb();
smp_send_nmi_allbutself();
apic_send_IPI_allbutself(NMI_VECTOR);
/* Kick CPUs looping in NMI context. */
WRITE_ONCE(crash_ipi_issued, 1);