diff options
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/Makefile | 2 | ||||
| -rw-r--r-- | arch/powerpc/kernel/idle.c | 23 | ||||
| -rw-r--r-- | arch/powerpc/kernel/init_task.c | 29 | ||||
| -rw-r--r-- | arch/powerpc/kernel/process.c | 31 | ||||
| -rw-r--r-- | arch/powerpc/kernel/smp.c | 76 |
5 files changed, 7 insertions, 154 deletions
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile index f5808a35688c..83afacd3ba7b 100644 --- a/arch/powerpc/kernel/Makefile +++ b/arch/powerpc/kernel/Makefile @@ -28,7 +28,7 @@ endif obj-y := cputable.o ptrace.o syscalls.o \ irq.o align.o signal_32.o pmc.o vdso.o \ - init_task.o process.o systbl.o idle.o \ + process.o systbl.o idle.o \ signal.o sysfs.o cacheinfo.o time.o \ prom.o traps.o setup-common.o \ udbg.o misc.o io.o dma.o \ diff --git a/arch/powerpc/kernel/idle.c b/arch/powerpc/kernel/idle.c index 6d2209ac0c44..2099d9a879e8 100644 --- a/arch/powerpc/kernel/idle.c +++ b/arch/powerpc/kernel/idle.c @@ -113,29 +113,6 @@ void cpu_idle(void) } } - -/* - * cpu_idle_wait - Used to ensure that all the CPUs come out of the old - * idle loop and start using the new idle loop. - * Required while changing idle handler on SMP systems. - * Caller must have changed idle handler to the new value before the call. - * This window may be larger on shared systems. - */ -void cpu_idle_wait(void) -{ - int cpu; - smp_mb(); - - /* kick all the CPUs so that they exit out of old idle routine */ - get_online_cpus(); - for_each_online_cpu(cpu) { - if (cpu != smp_processor_id()) - smp_send_reschedule(cpu); - } - put_online_cpus(); -} -EXPORT_SYMBOL_GPL(cpu_idle_wait); - int powersave_nap; #ifdef CONFIG_SYSCTL diff --git a/arch/powerpc/kernel/init_task.c b/arch/powerpc/kernel/init_task.c deleted file mode 100644 index d076d465dbd1..000000000000 --- a/arch/powerpc/kernel/init_task.c +++ /dev/null @@ -1,29 +0,0 @@ -#include <linux/mm.h> -#include <linux/export.h> -#include <linux/sched.h> -#include <linux/init.h> -#include <linux/init_task.h> -#include <linux/fs.h> -#include <linux/mqueue.h> -#include <asm/uaccess.h> - -static struct signal_struct init_signals = INIT_SIGNALS(init_signals); -static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); -/* - * Initial thread structure. - * - * We need to make sure that this is 16384-byte aligned due to the - * way process stacks are handled. This is done by having a special - * "init_task" linker map entry.. - */ -union thread_union init_thread_union __init_task_data = - { INIT_THREAD_INFO(init_task) }; - -/* - * Initial task structure. - * - * All other task structs will be allocated on slabs in fork.c - */ -struct task_struct init_task = INIT_TASK(init_task); - -EXPORT_SYMBOL(init_task); diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 4937c9690090..aa05935b6947 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1252,37 +1252,6 @@ void __ppc64_runlatch_off(void) } #endif /* CONFIG_PPC64 */ -#if THREAD_SHIFT < PAGE_SHIFT - -static struct kmem_cache *thread_info_cache; - -struct thread_info *alloc_thread_info_node(struct task_struct *tsk, int node) -{ - struct thread_info *ti; - - ti = kmem_cache_alloc_node(thread_info_cache, GFP_KERNEL, node); - if (unlikely(ti == NULL)) - return NULL; -#ifdef CONFIG_DEBUG_STACK_USAGE - memset(ti, 0, THREAD_SIZE); -#endif - return ti; -} - -void free_thread_info(struct thread_info *ti) -{ - kmem_cache_free(thread_info_cache, ti); -} - -void thread_info_cache_init(void) -{ - thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE, - THREAD_SIZE, 0, NULL); - BUG_ON(thread_info_cache == NULL); -} - -#endif /* THREAD_SHIFT < PAGE_SHIFT */ - unsigned long arch_align_stack(unsigned long sp) { if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c index d9f94410fd7f..e4cb34322de4 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 |