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Subject[tip:perf/nmi] x86: Move notify_die from nmi.c to traps.c
Commit-ID:  e40b17208b6805be50ffe891878662b6076206b9
Gitweb: http://git.kernel.org/tip/e40b17208b6805be50ffe891878662b6076206b9
Author: Don Zickus <dzickus@redhat.com>
AuthorDate: Fri, 5 Feb 2010 21:47:03 -0500
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Mon, 8 Feb 2010 08:29:02 +0100

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>
---
arch/x86/kernel/apic/nmi.c | 7 -------
arch/x86/kernel/traps.c | 5 +++++
2 files changed, 5 insertions(+), 7 deletions(-)
diff --git a/arch/x86/kernel/apic/nmi.c b/arch/x86/kernel/apic/nmi.c
index 0159a69..5d47682 100644
--- a/arch/x86/kernel/apic/nmi.c
+++ b/arch/x86/kernel/apic/nmi.c
@@ -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)) {
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 1168e44..51ef893 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -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.

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