MIPS: Add arch generic CPU hotplug

[safe/jmp/linux-2.6] / arch / mips / kernel / smp.c

diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
index 58f4679..bc7d9b0 100644 (file)
--- a/arch/mips/kernel/smp.c
+++ b/arch/mips/kernel/smp.c
@@ -45,7 +45,7 @@
 #include <asm/mipsmtregs.h>
 #endif /* CONFIG_MIPS_MT_SMTC */
 
-static volatile cpumask_t cpu_callin_map;      /* Bitmask of started secondaries */
+volatile cpumask_t cpu_callin_map;     /* Bitmask of started secondaries */
 int __cpu_number_map[NR_CPUS];         /* Map physical to logical */
 int __cpu_logical_map[NR_CPUS];                /* Map logical to physical */
 
@@ -201,6 +201,8 @@ void __devinit smp_prepare_boot_cpu(void)
  * and keep control until "cpu_online(cpu)" is set.  Note: cpu is
  * physical, not logical.
  */
+static struct task_struct *cpu_idle_thread[NR_CPUS];
+
 int __cpuinit __cpu_up(unsigned int cpu)
 {
        struct task_struct *idle;
@@ -210,9 +212,16 @@ int __cpuinit __cpu_up(unsigned int cpu)
         * The following code is purely to make sure
         * Linux can schedule processes on this slave.
         */
-       idle = fork_idle(cpu);
-       if (IS_ERR(idle))
-               panic(KERN_ERR "Fork failed for CPU %d", cpu);
+       if (!cpu_idle_thread[cpu]) {
+               idle = fork_idle(cpu);
+               cpu_idle_thread[cpu] = idle;
+
+               if (IS_ERR(idle))
+                       panic(KERN_ERR "Fork failed for CPU %d", cpu);
+       } else {
+               idle = cpu_idle_thread[cpu];
+               init_idle(idle, cpu);
+       }
 
        mp_ops->boot_secondary(cpu, idle);