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authorAnton Arapov <anton@redhat.com>2012-08-07 11:21:50 +0200
committerAnton Arapov <anton@redhat.com>2012-08-07 12:52:25 +0200
commit1d44b6f3fcf6058fb7c960b7558766967e8028f7 (patch)
tree53d88547c973ba048d233091a3f91f3173ad01df /arch/powerpc/kernel/smp.c
parentd91eda5d7b0383e6a0c83e0146ff141ff3b1355b (diff)
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fedora kernel: 222b075b3ff0d9e88aa9353e3c80667756ed7361v3.5.0-4
Signed-off-by: Anton Arapov <anton@redhat.com>
Diffstat (limited to 'arch/powerpc/kernel/smp.c')
-rw-r--r--arch/powerpc/kernel/smp.c76
1 files changed, 6 insertions, 70 deletions
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index d9f94410fd7..e4cb34322de 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -57,27 +57,9 @@
#define DBG(fmt...)
#endif
-
-/* Store all idle threads, this can be reused instead of creating
-* a new thread. Also avoids complicated thread destroy functionality
-* for idle threads.
-*/
#ifdef CONFIG_HOTPLUG_CPU
-/*
- * Needed only for CONFIG_HOTPLUG_CPU because __cpuinitdata is
- * removed after init for !CONFIG_HOTPLUG_CPU.
- */
-static DEFINE_PER_CPU(struct task_struct *, idle_thread_array);
-#define get_idle_for_cpu(x) (per_cpu(idle_thread_array, x))
-#define set_idle_for_cpu(x, p) (per_cpu(idle_thread_array, x) = (p))
-
/* State of each CPU during hotplug phases */
static DEFINE_PER_CPU(int, cpu_state) = { 0 };
-
-#else
-static struct task_struct *idle_thread_array[NR_CPUS] __cpuinitdata ;
-#define get_idle_for_cpu(x) (idle_thread_array[(x)])
-#define set_idle_for_cpu(x, p) (idle_thread_array[(x)] = (p))
#endif
struct thread_info *secondary_ti;
@@ -429,60 +411,19 @@ int generic_check_cpu_restart(unsigned int cpu)
}
#endif
-struct create_idle {
- struct work_struct work;
- struct task_struct *idle;
- struct completion done;
- int cpu;
-};
-
-static void __cpuinit do_fork_idle(struct work_struct *work)
+static void cpu_idle_thread_init(unsigned int cpu, struct task_struct *idle)
{
- 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 create_idle(unsigned int cpu)
-{
- struct thread_info *ti;
- struct create_idle c_idle = {
- .cpu = cpu,
- .done = COMPLETION_INITIALIZER_ONSTACK(c_idle.done),
- };
- INIT_WORK_ONSTACK(&c_idle.work, do_fork_idle);
-
- c_idle.idle = get_idle_for_cpu(cpu);
-
- /* We can't use kernel_thread since we must avoid to
- * reschedule the child. We use a workqueue because
- * we want to fork from a kernel thread, not whatever
- * userspace process happens to be trying to online us.
- */
- if (!c_idle.idle) {
- schedule_work(&c_idle.work);
- wait_for_completion(&c_idle.done);
- } else
- init_idle(c_idle.idle, cpu);
- if (IS_ERR(c_idle.idle)) {
- pr_err("Failed fork for CPU %u: %li", cpu, PTR_ERR(c_idle.idle));
- return PTR_ERR(c_idle.idle);
- }
- ti = task_thread_info(c_idle.idle);
+ struct thread_info *ti = task_thread_info(idle);
#ifdef CONFIG_PPC64
- paca[cpu].__current = c_idle.idle;
+ paca[cpu].__current = idle;
paca[cpu].kstack = (unsigned long)ti + THREAD_SIZE - STACK_FRAME_OVERHEAD;
#endif
ti->cpu = cpu;
- current_set[cpu] = ti;
-
- return 0;
+ secondary_ti = current_set[cpu] = ti;
}
-int __cpuinit __cpu_up(unsigned int cpu)
+int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *tidle)
{
int rc, c;
@@ -490,12 +431,7 @@ int __cpuinit __cpu_up(unsigned int cpu)
(smp_ops->cpu_bootable && !smp_ops->cpu_bootable(cpu)))
return -EINVAL;
- /* Make sure we have an idle thread */
- rc = create_idle(cpu);
- if (rc)
- return rc;
-
- secondary_ti = current_set[cpu];
+ cpu_idle_thread_init(cpu, tidle);
/* Make sure callin-map entry is 0 (can be leftover a CPU
* hotplug