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Subject[PATCH 1/3 v2] [x86] move notify_die from nmi.c to traps.c
Date
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>
---
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 3339917..3be4687 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.
--
1.6.6.83.gc9a2


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