linux-kernel - [PATCH 04/27] smpboot, x86, xen: Determine smp booting implementations at run-time

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Date:	Fri, 01 Jun 2012 14:41:19 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	tglx@...utronix.de, peterz@...radead.org,
	paulmck@...ux.vnet.ibm.com
Cc:	rusty@...tcorp.com.au, mingo@...nel.org, yong.zhang0@...il.com,
	akpm@...ux-foundation.org, vatsa@...ux.vnet.ibm.com, rjw@...k.pl,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	srivatsa.bhat@...ux.vnet.ibm.com, nikunj@...ux.vnet.ibm.com,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: [PATCH 04/27] smpboot, x86,
 xen: Determine smp booting implementations at run-time

x86 and xen use the smp_ops structure to determine their respective
implementations of common functions at run-time, by registering appropriate
function pointers at early boot. Hook on to this mechanism for generic smp
booting implementation as well.

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: x86@...nel.org
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Jeremy Fitzhardinge <jeremy@...p.org>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
---

 arch/x86/include/asm/smp.h |   22 ++++++++++++++++++++++
 1 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h
index f483945..ac1f3eb 100644
--- a/arch/x86/include/asm/smp.h
+++ b/arch/x86/include/asm/smp.h
@@ -72,6 +72,10 @@ struct smp_ops {
 	void (*stop_other_cpus)(int wait);
 	void (*smp_send_reschedule)(int cpu);
 
+	void (*cpu_pre_starting)(void *arg);
+	void (*cpu_pre_online)(void *arg);
+	void (*cpu_post_online)(void *arg);
+
 	int (*cpu_up)(unsigned cpu, struct task_struct *tidle);
 	int (*cpu_disable)(void);
 	void (*cpu_die)(unsigned int cpu);
@@ -115,6 +119,24 @@ static inline void smp_cpus_done(unsigned int max_cpus)
 	smp_ops.smp_cpus_done(max_cpus);
 }
 
+static inline void __cpu_pre_starting(void *arg)
+{
+	smp_ops.cpu_pre_starting(arg);
+}
+#define __cpu_pre_starting	__cpu_pre_starting
+
+static inline void __cpu_pre_online(void *arg)
+{
+	smp_ops.cpu_pre_online(arg);
+}
+#define __cpu_pre_online	__cpu_pre_online
+
+static inline void __cpu_post_online(void *arg)
+{
+	smp_ops.cpu_post_online(arg);
+}
+#define __cpu_post_online	__cpu_post_online
+
 static inline int __cpu_up(unsigned int cpu, struct task_struct *tidle)
 {
 	return smp_ops.cpu_up(cpu, tidle);

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