Commit e40b1720 authored Feb 05, 2010 by Don Zickus Committed by Ingo Molnar Feb 08, 2010

x86: Move notify_die from nmi.c to traps.c



In order to handle a new nmi_watchdog approach, I need to move
the notify_die() routine out of nmi_watchdog_tick() and into
default_do_nmi(). This lets me easily swap out the old
nmi_watchdog with the new one with just a config change.

The change probably makes sense from a high level perspective
because the nmi_watchdog shouldn't be handling notify_die
routines anyway.  However, this move does change the semantics a
little bit.  Instead of checking on every nmi interrupt if the
cpus are stuck, only check them on the nmi_watchdog interrupts.

 v2: Move notify_die call into #idef block

Signed-off-by: Don Zickus <dzickus@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: gorcunov@gmail.com
Cc: aris@redhat.com
Cc: peterz@infradead.org
LKML-Reference: <1265424425-31562-2-git-send-email-dzickus@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent 076dc4a6

arch/x86/kernel/apic/nmi.c

+0 −7

Original line number	Diff line number	Diff line
		@@ -400,13 +400,6 @@ nmi_watchdog_tick(struct pt_regs *regs, unsigned reason)
		int cpu = smp_processor_id();
		int rc = 0;

		/* check for other users first */
		if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT)
		== NOTIFY_STOP) {
		rc = 1;
		touched = 1;
		}

		sum = get_timer_irqs(cpu);

		if (__get_cpu_var(nmi_touch)) {

arch/x86/kernel/traps.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -400,7 +400,12 @@ static notrace __kprobes void default_do_nmi(struct pt_regs *regs)
		if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT)
		== NOTIFY_STOP)
		return;

		#ifdef CONFIG_X86_LOCAL_APIC
		if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT)
		== NOTIFY_STOP)
		return;

		/*
		* Ok, so this is none of the documented NMI sources,
		* so it must be the NMI watchdog.