linux-kernel - [PATCH 06/27] xen, smpboot: Use generic SMP booting infrastructure

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Message-ID: <20120601091136.31979.36213.stgit@srivatsabhat.in.ibm.com>
Date:	Fri, 01 Jun 2012 14:41:43 +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,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	xen-devel@...ts.xensource.com,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 06/27] xen, smpboot: Use generic SMP booting infrastructure

Convert xen to use the generic framework to boot secondary CPUs.

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

 arch/x86/xen/smp.c |   21 ++++-----------------
 1 files changed, 4 insertions(+), 17 deletions(-)

diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 602d6b7..46c96f9 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -58,13 +58,12 @@ static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static void __cpuinit cpu_bringup(void)
+void __cpuinit xen_cpu_pre_starting(void *unused)
 {
 	int cpu;
 
 	cpu_init();
 	touch_softlockup_watchdog();
-	preempt_disable();
 
 	xen_enable_sysenter();
 	xen_enable_syscall();
@@ -75,25 +74,11 @@ static void __cpuinit cpu_bringup(void)
 	set_cpu_sibling_map(cpu);
 
 	xen_setup_cpu_clockevents();
-
-	notify_cpu_starting(cpu);
-
-	set_cpu_online(cpu, true);
-
-	this_cpu_write(cpu_state, CPU_ONLINE);
-
-	wmb();
-
-	/* We can take interrupts now: we're officially "up". */
-	local_irq_enable();
-
-	wmb();			/* make sure everything is out */
 }
 
 static void __cpuinit cpu_bringup_and_idle(void)
 {
-	cpu_bringup();
-	cpu_idle();
+	smpboot_start_secondary(NULL);
 }
 
 static int xen_smp_intr_init(unsigned int cpu)
@@ -515,6 +500,8 @@ static const struct smp_ops xen_smp_ops __initconst = {
 	.smp_prepare_cpus = xen_smp_prepare_cpus,
 	.smp_cpus_done = xen_smp_cpus_done,
 
+	.cpu_pre_starting = xen_cpu_pre_starting,
+
 	.cpu_up = xen_cpu_up,
 	.cpu_die = xen_cpu_die,
 	.cpu_disable = xen_cpu_disable,

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