From 39c715b71740c4a78ba4769fb54826929bac03cb Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Tue, 21 Jun 2005 17:14:34 -0700 Subject: [PATCH] smp_processor_id() cleanup This patch implements a number of smp_processor_id() cleanup ideas that Arjan van de Ven and I came up with. The previous __smp_processor_id/_smp_processor_id/smp_processor_id API spaghetti was hard to follow both on the implementational and on the usage side. Some of the complexity arose from picking wrong names, some of the complexity comes from the fact that not all architectures defined __smp_processor_id. In the new code, there are two externally visible symbols: - smp_processor_id(): debug variant. - raw_smp_processor_id(): nondebug variant. Replaces all existing uses of _smp_processor_id() and __smp_processor_id(). Defined by every SMP architecture in include/asm-*/smp.h. There is one new internal symbol, dependent on DEBUG_PREEMPT: - debug_smp_processor_id(): internal debug variant, mapped to smp_processor_id(). Also, i moved debug_smp_processor_id() from lib/kernel_lock.c into a new lib/smp_processor_id.c file. All related comments got updated and/or clarified. I have build/boot tested the following 8 .config combinations on x86: {SMP,UP} x {PREEMPT,!PREEMPT} x {DEBUG_PREEMPT,!DEBUG_PREEMPT} I have also build/boot tested x64 on UP/PREEMPT/DEBUG_PREEMPT. (Other architectures are untested, but should work just fine.) Signed-off-by: Ingo Molnar Signed-off-by: Arjan van de Ven Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/module.c | 2 +- kernel/power/smp.c | 4 ++-- kernel/sched.c | 4 ++-- kernel/stop_machine.c | 4 ++-- 4 files changed, 7 insertions(+), 7 deletions(-) (limited to 'kernel') diff --git a/kernel/module.c b/kernel/module.c index 83b3d376708c..a566745dde62 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -379,7 +379,7 @@ static void module_unload_init(struct module *mod) for (i = 0; i < NR_CPUS; i++) local_set(&mod->ref[i].count, 0); /* Hold reference count during initialization. */ - local_set(&mod->ref[_smp_processor_id()].count, 1); + local_set(&mod->ref[raw_smp_processor_id()].count, 1); /* Backwards compatibility macros put refcount during init. */ mod->waiter = current; } diff --git a/kernel/power/smp.c b/kernel/power/smp.c index cba3584b80fe..457c2302ed42 100644 --- a/kernel/power/smp.c +++ b/kernel/power/smp.c @@ -48,11 +48,11 @@ void disable_nonboot_cpus(void) { oldmask = current->cpus_allowed; set_cpus_allowed(current, cpumask_of_cpu(0)); - printk("Freezing CPUs (at %d)", _smp_processor_id()); + printk("Freezing CPUs (at %d)", raw_smp_processor_id()); current->state = TASK_INTERRUPTIBLE; schedule_timeout(HZ); printk("..."); - BUG_ON(_smp_processor_id() != 0); + BUG_ON(raw_smp_processor_id() != 0); /* FIXME: for this to work, all the CPUs must be running * "idle" thread (or we deadlock). Is that guaranteed? */ diff --git a/kernel/sched.c b/kernel/sched.c index f12a0c8a7d98..deca041fc364 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -3814,7 +3814,7 @@ EXPORT_SYMBOL(yield); */ void __sched io_schedule(void) { - struct runqueue *rq = &per_cpu(runqueues, _smp_processor_id()); + struct runqueue *rq = &per_cpu(runqueues, raw_smp_processor_id()); atomic_inc(&rq->nr_iowait); schedule(); @@ -3825,7 +3825,7 @@ EXPORT_SYMBOL(io_schedule); long __sched io_schedule_timeout(long timeout) { - struct runqueue *rq = &per_cpu(runqueues, _smp_processor_id()); + struct runqueue *rq = &per_cpu(runqueues, raw_smp_processor_id()); long ret; atomic_inc(&rq->nr_iowait); diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c index 6116b25aa7cf..84a9d18aa8da 100644 --- a/kernel/stop_machine.c +++ b/kernel/stop_machine.c @@ -100,7 +100,7 @@ static int stop_machine(void) stopmachine_state = STOPMACHINE_WAIT; for_each_online_cpu(i) { - if (i == _smp_processor_id()) + if (i == raw_smp_processor_id()) continue; ret = kernel_thread(stopmachine, (void *)(long)i,CLONE_KERNEL); if (ret < 0) @@ -182,7 +182,7 @@ struct task_struct *__stop_machine_run(int (*fn)(void *), void *data, /* If they don't care which CPU fn runs on, bind to any online one. */ if (cpu == NR_CPUS) - cpu = _smp_processor_id(); + cpu = raw_smp_processor_id(); p = kthread_create(do_stop, &smdata, "kstopmachine"); if (!IS_ERR(p)) { -- cgit v1.2.2