linux-kernel - [PATCH 1/3] [RFC][x86] move notify

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Message-Id: <1264622622-5778-2-git-send-email-dzickus@redhat.com>
Date:	Wed, 27 Jan 2010 15:03:40 -0500
From:	Don Zickus <dzickus@...hat.com>
To:	mingo@...e.hu, peterz@...radead.org, gorcunov@...il.com
Cc:	aris@...hat.com, linux-kernel@...r.kernel.org,
	Don Zickus <dzickus@...hat.com>
Subject: [PATCH 1/3] [RFC][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.

Signed-off-by: Don Zickus <dzickus@...hat.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..3b98dd3 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -400,6 +400,11 @@ 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;
+
+	        if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT)
+	        			                == NOTIFY_STOP)
+	                return;
+
 #ifdef CONFIG_X86_LOCAL_APIC
 		/*
 		 * Ok, so this is none of the documented NMI sources,
-- 
1.6.5.2

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