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

["Srivatsa S. Bhat" <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>]

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

Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: x86@xxxxxxxxxx
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Cc: virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>
---

 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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