Linux Virtualization - Jun 2012 - [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 at oracle.com>
Cc: Jeremy Fitzhardinge <jeremy at goop.org>
Cc: Thomas Gleixner <tglx at linutronix.de>
Cc: Ingo Molnar <mingo at redhat.com>
Cc: "H. Peter Anvin" <hpa at zytor.com>
Cc: x86 at kernel.org
Cc: xen-devel at lists.xensource.com
Cc: virtualization at lists.linux-foundation.org
Cc: linux-kernel at vger.kernel.org
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat at linux.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,