linux-kernel - [tip:core/ipi] panic, smp: provide smp_send

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Date:	Fri, 13 Mar 2009 10:36:44 GMT
From:	Ingo Molnar <mingo@...e.hu>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:core/ipi] panic, smp: provide smp_send_stop() wrapper on UP too

Commit-ID:  d1dedb52acd98bd5e13e1ff4c4d045d58bbd16fe
Gitweb:     http://git.kernel.org/tip/d1dedb52acd98bd5e13e1ff4c4d045d58bbd16fe
Author:     Ingo Molnar <mingo@...e.hu>
AuthorDate: Fri, 13 Mar 2009 11:14:06 +0100
Commit:     Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 13 Mar 2009 11:24:31 +0100

panic, smp: provide smp_send_stop() wrapper on UP too

Impact: cleanup, no code changed

Remove an ugly #ifdef CONFIG_SMP from panic(), by providing
an smp_send_stop() wrapper on UP too.

LKML-Reference: <49B91A7E.76E4.0078.0@...ell.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 include/linux/smp.h |    4 +++-
 kernel/panic.c      |    2 --
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/smp.h b/include/linux/smp.h
index 2d3bcb6..a69db82 100644
--- a/include/linux/smp.h
+++ b/include/linux/smp.h
@@ -38,7 +38,7 @@ int smp_call_function_single(int cpuid, void (*func) (void *info), void *info,
 /*
  * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
  * (defined in asm header):
- */ 
+ */
 
 /*
  * stops all CPUs but the current one:
@@ -122,6 +122,8 @@ extern unsigned int setup_max_cpus;
 
 #else /* !SMP */
 
+static inline void smp_send_stop(void) { }
+
 /*
  *	These macros fold the SMP functionality into a single CPU system
  */
diff --git a/kernel/panic.c b/kernel/panic.c
index 57fb005..ca75e81 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -85,14 +85,12 @@ NORET_TYPE void panic(const char * fmt, ...)
 	 */
 	crash_kexec(NULL);
 
-#ifdef CONFIG_SMP
 	/*
 	 * Note smp_send_stop is the usual smp shutdown function, which
 	 * unfortunately means it may not be hardened to work in a panic
 	 * situation.
 	 */
 	smp_send_stop();
-#endif
 
 	atomic_notifier_call_chain(&panic_notifier_list, 0, buf);
 
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