diff options
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/Makefile | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/apm_32.c | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/init_task.c | 42 | ||||
| -rw-r--r-- | arch/x86/kernel/irq_32.c | 8 | ||||
| -rw-r--r-- | arch/x86/kernel/process.c | 34 | ||||
| -rw-r--r-- | arch/x86/kernel/smpboot.c | 83 |
6 files changed, 28 insertions, 143 deletions
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index 532d2e0..56ebd1f 100644 --- a/arch/x86/kernel/Makefile +++ b/arch/x86/kernel/Makefile @@ -2,7 +2,7 @@ # Makefile for the linux kernel. # -extra-y := head_$(BITS).o head$(BITS).o head.o init_task.o vmlinux.lds +extra-y := head_$(BITS).o head$(BITS).o head.o vmlinux.lds CPPFLAGS_vmlinux.lds += -U$(UTS_MACHINE) diff --git a/arch/x86/kernel/apm_32.c b/arch/x86/kernel/apm_32.c index 459e78c..07b0c0d 100644 --- a/arch/x86/kernel/apm_32.c +++ b/arch/x86/kernel/apm_32.c @@ -2401,7 +2401,7 @@ static void __exit apm_exit(void) * (pm_idle), Wait for all processors to update cached/local * copies of pm_idle before proceeding. */ - cpu_idle_wait(); + kick_all_cpus_sync(); } if (((apm_info.bios.flags & APM_BIOS_DISENGAGED) == 0) && (apm_info.connection_version > 0x0100)) { diff --git a/arch/x86/kernel/init_task.c b/arch/x86/kernel/init_task.c deleted file mode 100644 index 43e9ccf..0000000 --- a/arch/x86/kernel/init_task.c +++ /dev/null @@ -1,42 +0,0 @@ -#include <linux/mm.h> -#include <linux/module.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> -#include <asm/pgtable.h> -#include <asm/desc.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 THREAD_SIZE 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); - -/* - * per-CPU TSS segments. Threads are completely 'soft' on Linux, - * no more per-task TSS's. The TSS size is kept cacheline-aligned - * so they are allowed to end up in the .data..cacheline_aligned - * section. Since TSS's are completely CPU-local, we want them - * on exact cacheline boundaries, to eliminate cacheline ping-pong. - */ -DEFINE_PER_CPU_SHARED_ALIGNED(struct tss_struct, init_tss) = INIT_TSS; - diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c index 58b7f27..344faf8 100644 --- a/arch/x86/kernel/irq_32.c +++ b/arch/x86/kernel/irq_32.c @@ -127,8 +127,8 @@ void __cpuinit irq_ctx_init(int cpu) return; irqctx = page_address(alloc_pages_node(cpu_to_node(cpu), - THREAD_FLAGS, - THREAD_ORDER)); + THREADINFO_GFP, + THREAD_SIZE_ORDER)); memset(&irqctx->tinfo, 0, sizeof(struct thread_info)); irqctx->tinfo.cpu = cpu; irqctx->tinfo.preempt_count = HARDIRQ_OFFSET; @@ -137,8 +137,8 @@ void __cpuinit irq_ctx_init(int cpu) per_cpu(hardirq_ctx, cpu) = irqctx; irqctx = page_address(alloc_pages_node(cpu_to_node(cpu), - THREAD_FLAGS, - THREAD_ORDER)); + THREADINFO_GFP, + THREAD_SIZE_ORDER)); memset(&irqctx->tinfo, 0, sizeof(struct thread_info)); irqctx->tinfo.cpu = cpu; irqctx->tinfo.addr_limit = MAKE_MM_SEG(0); diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index 1d92a5a..e817315 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -27,6 +27,15 @@ #include <asm/debugreg.h> #include <asm/nmi.h> +/* + * per-CPU TSS segments. Threads are completely 'soft' on Linux, + * no more per-task TSS's. The TSS size is kept cacheline-aligned + * so they are allowed to end up in the .data..cacheline_aligned + * section. Since TSS's are completely CPU-local, we want them + * on exact cacheline boundaries, to eliminate cacheline ping-pong. + */ +DEFINE_PER_CPU_SHARED_ALIGNED(struct tss_struct, init_tss) = INIT_TSS; + #ifdef CONFIG_X86_64 static DEFINE_PER_CPU(unsigned char, is_idle); static ATOMIC_NOTIFIER_HEAD(idle_notifier); @@ -67,10 +76,9 @@ void free_thread_xstate(struct task_struct *tsk) fpu_free(&tsk->thread.fpu); } -void free_thread_info(struct thread_info *ti) +void arch_release_task_struct(struct task_struct *tsk) { - free_thread_xstate(ti->task); - free_pages((unsigned long)ti, THREAD_ORDER); + free_thread_xstate(tsk); } void arch_task_cache_init(void) @@ -516,26 +524,6 @@ void stop_this_cpu(void *dummy) } } -static void do_nothing(void *unused) -{ -} - -/* - * cpu_idle_wait - Used to ensure that all the CPUs discard old value of - * pm_idle and update to new pm_idle value. Required while changing pm_idle - * handler on SMP systems. - * - * Caller must have changed pm_idle to the new value before the call. Old - * pm_idle value will not be used by any CPU after the return of this function. - */ -void cpu_idle_wait(void) -{ - smp_mb(); - /* kick all the CPUs so that they exit out of pm_idle */ - smp_call_function(do_nothing, NULL, 1); -} -EXPORT_SYMBOL_GPL(cpu_idle_wait); - /* Default MONITOR/MWAIT with no hints, used for default C1 state */ static void mwait_idle(void) { diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 6e1e406..3acaf51 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -76,20 +76,8 @@ /* State of each CPU */ DEFINE_PER_CPU(int, cpu_state) = { 0 }; -/* 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)) - -/* * We need this for trampoline_base protection from concurrent accesses when * off- and onlining cores wildly. */ @@ -97,20 +85,16 @@ static DEFINE_MUTEX(x86_cpu_hotplug_driver_mutex); void cpu_hotplug_driver_lock(void) { - mutex_lock(&x86_cpu_hotplug_driver_mutex); + mutex_lock(&x86_cpu_hotplug_driver_mutex); } void cpu_hotplug_driver_unlock(void) { - mutex_unlock(&x86_cpu_hotplug_driver_mutex); + mutex_unlock(&x86_cpu_hotplug_driver_mutex); } ssize_t arch_cpu_probe(const char *buf, size_t count) { return -1; } ssize_t arch_cpu_release(const char *buf, size_t count) { return -1; } -#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 /* Number of siblings per CPU package */ @@ -618,22 +602,6 @@ wakeup_secondary_cpu_via_init(int phys_apicid, unsigned long start_eip) return (send_status | accept_status); } -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) -{ - struct create_idle *c_idle = - container_of(work, struct create_idle, work); - - c_idle->idle = fork_idle(c_idle->cpu); - complete(&c_idle->done); -} - /* reduce the number of lines printed when booting a large cpu count system */ static void __cpuinit announce_cpu(int cpu, int apicid) { @@ -660,58 +628,31 @@ static void __cpuinit announce_cpu(int cpu, int apicid) * Returns zero if CPU booted OK, else error code from * ->wakeup_secondary_cpu. */ -static int __cpuinit do_boot_cpu(int apicid, int cpu) +static int __cpuinit do_boot_cpu(int apicid, int cpu, struct task_struct *idle) { unsigned long boot_error = 0; unsigned long start_ip; int timeout; - struct create_idle c_idle = { - .cpu = cpu, - .done = COMPLETION_INITIALIZER_ONSTACK(c_idle.done), - }; - - INIT_WORK_ONSTACK(&c_idle.work, do_fork_idle); alternatives_smp_switch(1); - c_idle.idle = get_idle_for_cpu(cpu); - - /* - * We can't use kernel_thread since we must avoid to - * reschedule the child. - */ - if (c_idle.idle) { - c_idle.idle->thread.sp = (unsigned long) (((struct pt_regs *) - (THREAD_SIZE + task_stack_page(c_idle.idle))) - 1); - init_idle(c_idle.idle, cpu); - goto do_rest; - } + idle->thread.sp = (unsigned long) (((struct pt_regs *) + (THREAD_SIZE + task_stack_page(idle))) - 1); + per_cpu(current_task, cpu) = idle; - schedule_work(&c_idle.work); - wait_for_completion(&c_idle.done); - - if (IS_ERR(c_idle.idle)) { - printk("failed fork for CPU %d\n", cpu); - destroy_work_on_stack(&c_idle.work); - return PTR_ERR(c_idle.idle); - } - - set_idle_for_cpu(cpu, c_idle.idle); -do_rest: - per_cpu(current_task, cpu) = c_idle.idle; #ifdef CONFIG_X86_32 /* Stack for startup_32 can be just as for start_secondary onwards */ irq_ctx_init(cpu); #else - clear_tsk_thread_flag(c_idle.idle, TIF_FORK); + clear_tsk_thread_flag(idle, TIF_FORK); initial_gs = per_cpu_offset(cpu); per_cpu(kernel_stack, cpu) = - (unsigned long)task_stack_page(c_idle.idle) - + (unsigned long)task_stack_page(idle) - KERNEL_STACK_OFFSET + THREAD_SIZE; #endif early_gdt_descr.address = (unsigned long)get_cpu_gdt_table(cpu); initial_code = (unsigned long)start_secondary; - stack_start = c_idle.idle->thread.sp; + stack_start = idle->thread.sp; /* start_ip had better be page-aligned! */ start_ip = trampoline_address(); @@ -813,12 +754,10 @@ do_rest: */ smpboot_restore_warm_reset_vector(); } - - destroy_work_on_stack(&c_idle.work); return boot_error; } -int __cpuinit native_cpu_up(unsigned int cpu) +int __cpuinit native_cpu_up(unsigned int cpu, struct task_struct *tidle) { int apicid = apic->cpu_present_to_apicid(cpu); unsigned long flags; @@ -851,7 +790,7 @@ int __cpuinit native_cpu_up(unsigned int cpu) per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; - err = do_boot_cpu(apicid, cpu); + err = do_boot_cpu(apicid, cpu, tidle); if (err) { pr_debug("do_boot_cpu failed %d\n", err); return -EIO; |
