ia64: Use generic idle thread allocation

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Tony Luck <tony.luck@intel.com>
Link: http://lkml.kernel.org/r/20120420124557.380965133@linutronix.de

1 files changed, 3 insertions, 58 deletions

diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c
index 03e4ef3893c9..1113b8aba07f 100644
--- a/arch/ia64/kernel/smpboot.c
+++ b/arch/ia64/kernel/smpboot.c
@@ -75,13 +75,6 @@
 #endif
 
 /*
- * Store all idle threads, this can be reused instead of creating
- * a new thread. Also avoids complicated thread destroy functionality
- * for idle threads.
- */
-struct task_struct *idle_thread_array[NR_CPUS];
-
-/*
  * Global array allocated for NR_CPUS at boot time
  */
 struct sal_to_os_boot sal_boot_rendez_state[NR_CPUS];
@@ -94,13 +87,7 @@ struct sal_to_os_boot *sal_state_for_booting_cpu = &sal_boot_rendez_state[0];
 
 #define set_brendez_area(x) (sal_state_for_booting_cpu = &sal_boot_rendez_state[(x)]);
 
-#define get_idle_for_cpu(x)             (idle_thread_array[(x)])
-#define set_idle_for_cpu(x,p)   (idle_thread_array[(x)] = (p))
-
 #else
-
-#define get_idle_for_cpu(x)             (NULL)
-#define set_idle_for_cpu(x,p)
 #define set_brendez_area(x)
 #endif
 
@@ -480,54 +467,12 @@ struct pt_regs * __cpuinit idle_regs(struct pt_regs *regs)
         return NULL;
 }
 
-struct create_idle {
-        struct work_struct work;
-        struct task_struct *idle;
-        struct completion done;
-        int cpu;
-};
-
-void __cpuinit
-do_fork_idle(struct work_struct *work)
-{
-        struct create_idle *c_idle =
-                container_of(work, struct create_idle, work);
-
-        c_idle->idle = fork_idle(c_idle->cpu);
-        complete(&c_idle->done);
-}
-
 static int __cpuinit
-do_boot_cpu (int sapicid, int cpu)
+do_boot_cpu (int sapicid, int cpu, struct task_struct *idle)
 {
         int timeout;
-        struct create_idle c_idle = {
-                .work = __WORK_INITIALIZER(c_idle.work, do_fork_idle),
-                .cpu    = cpu,
-                .done   = COMPLETION_INITIALIZER(c_idle.done),
-        };
-
-        /*
-         * We can't use kernel_thread since we must avoid to
-         * reschedule the child.
-         */
-        c_idle.idle = get_idle_for_cpu(cpu);
-        if (c_idle.idle) {
-                init_idle(c_idle.idle, cpu);
-                goto do_rest;
-        }
-
-        schedule_work(&c_idle.work);
-        wait_for_completion(&c_idle.done);
-
-        if (IS_ERR(c_idle.idle))
-                panic("failed fork for CPU %d", cpu);
-
-        set_idle_for_cpu(cpu, c_idle.idle);
-
-do_rest:
-        task_for_booting_cpu = c_idle.idle;
 
+        task_for_booting_cpu = idle;
         Dprintk("Sending wakeup vector %lu to AP 0x%x/0x%x.\n", ap_wakeup_vector, cpu, sapicid);
 
         set_brendez_area(cpu);
@@ -811,7 +756,7 @@ __cpu_up(unsigned int cpu, struct task_struct *tidle)
 
         per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
         /* Processor goes to start_secondary(), sets online flag */
-        ret = do_boot_cpu(sapicid, cpu);
+        ret = do_boot_cpu(sapicid, cpu, tidle);
         if (ret < 0)
                 return ret;