linux-kernel - [PATCH 01/15] x86 kdump: Extract kdump-specific code from crash_nmi

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Message-Id: <1225915018-6548-2-git-send-email-ehabkost@redhat.com>
Date:	Wed,  5 Nov 2008 17:56:44 -0200
From:	Eduardo Habkost <ehabkost@...hat.com>
To:	Avi Kivity <avi@...hat.com>, Ingo Molnar <mingo@...e.hu>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Simon Horman <horms@...ge.net.au>,
	Andrew Morton <akpm@...l.org>, Vivek Goyal <vgoyal@...hat.com>,
	Haren Myneni <hbabu@...ibm.com>,
	Andrey Borzenkov <arvidjaar@...l.ru>, mingo@...hat.com,
	"Rafael J. Wysocki" <rjw@...k.pl>, kexec@...ts.infradead.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Eduardo Habkost <ehabkost@...hat.com>
Subject: [PATCH 01/15] x86 kdump: Extract kdump-specific code from crash_nmi_callback()

The NMI CPU-halting code will be used on non-kdump cases, also
(e.g. emergency_reboot when virtualization is enabled).

Signed-off-by: Eduardo Habkost <ehabkost@...hat.com>
---
 arch/x86/kernel/crash.c |   31 ++++++++++++++++++++-----------
 1 files changed, 20 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
index 81e01f7..d82ac72 100644
--- a/arch/x86/kernel/crash.c
+++ b/arch/x86/kernel/crash.c
@@ -35,19 +35,34 @@ static int crashing_cpu;
 #if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC)
 static atomic_t waiting_for_crash_ipi;
 
-static int crash_nmi_callback(struct notifier_block *self,
-			unsigned long val, void *data)
+static void kdump_nmi_callback(int cpu, struct die_args *args)
 {
 	struct pt_regs *regs;
 #ifdef CONFIG_X86_32
 	struct pt_regs fixed_regs;
 #endif
+
+	regs = args->regs;
+
+#ifdef CONFIG_X86_32
+	if (!user_mode_vm(regs)) {
+		crash_fixup_ss_esp(&fixed_regs, regs);
+		regs = &fixed_regs;
+	}
+#endif
+	crash_save_cpu(regs, cpu);
+
+	disable_local_APIC();
+}
+
+static int crash_nmi_callback(struct notifier_block *self,
+			unsigned long val, void *data)
+{
 	int cpu;
 
 	if (val != DIE_NMI_IPI)
 		return NOTIFY_OK;
 
-	regs = ((struct die_args *)data)->regs;
 	cpu = raw_smp_processor_id();
 
 	/* Don't do anything if this handler is invoked on crashing cpu.
@@ -58,14 +73,8 @@ static int crash_nmi_callback(struct notifier_block *self,
 		return NOTIFY_STOP;
 	local_irq_disable();
 
-#ifdef CONFIG_X86_32
-	if (!user_mode_vm(regs)) {
-		crash_fixup_ss_esp(&fixed_regs, regs);
-		regs = &fixed_regs;
-	}
-#endif
-	crash_save_cpu(regs, cpu);
-	disable_local_APIC();
+	kdump_nmi_callback(cpu, (struct die_args *)data);
+
 	atomic_dec(&waiting_for_crash_ipi);
 	/* Assume hlt works */
 	halt();
-- 
1.5.5.GIT

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