linux-kernel - [PATCH 7/8] x86: Make nmi_shootdown_cpus() available on !SMP and !X86_LOCAL

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Message-Id: <1226496884-24628-8-git-send-email-ehabkost@redhat.com>
Date:	Wed, 12 Nov 2008 11:34:43 -0200
From:	Eduardo Habkost <ehabkost@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Avi Kivity <avi@...hat.com>,
	"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>,
	"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 7/8] x86: Make nmi_shootdown_cpus() available on !SMP and !X86_LOCAL_APIC

The X86_LOCAL_APIC #ifdef was for kdump. For !SMP, the function simply
does nothing.

Signed-off-by: Eduardo Habkost <ehabkost@...hat.com>
---
 arch/x86/kernel/reboot.c |   13 ++++++++++++-
 1 files changed, 12 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 82fa28f..d0c9c77 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -524,7 +524,7 @@ void machine_crash_shutdown(struct pt_regs *regs)
 #endif
 
 
-#if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC)
+#if defined(CONFIG_SMP)
 
 /* This keeps a track of which one is crashing cpu. */
 static int crashing_cpu;
@@ -573,6 +573,12 @@ static struct notifier_block crash_nmi_nb = {
 	.notifier_call = crash_nmi_callback,
 };
 
+/* Halt all other CPUs, calling the specified function on each of them
+ *
+ * This function can be used to halt all other CPUs on crash
+ * or emergency reboot time. The function passed as parameter
+ * will be called inside a NMI handler on all CPUs.
+ */
 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
 {
 	unsigned long msecs;
@@ -601,4 +607,9 @@ void nmi_shootdown_cpus(nmi_shootdown_cb callback)
 
 	/* Leave the nmi callback set */
 }
+#else /* !CONFIG_SMP */
+void nmi_shootdown_cpus(nmi_shootdown_cb callback)
+{
+	/* No other CPUs to shoot down */
+}
 #endif
-- 
1.5.5.GIT

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