From e1d12f327037a59e06c66520951ab4e0bd29f9c4 Mon Sep 17 00:00:00 2001 From: Andrew Morton Date: Tue, 30 Apr 2013 15:27:28 -0700 Subject: kernel/smp.c: cleanups We sometimes use "struct call_single_data *data" and sometimes "struct call_single_data *csd". Use "csd" consistently. We sometimes use "struct call_function_data *data" and sometimes "struct call_function_data *cfd". Use "cfd" consistently. Also, avoid some 80-col layout tricks. Cc: Ingo Molnar Cc: Jens Axboe Cc: Peter Zijlstra Cc: Shaohua Li Cc: Shaohua Li Cc: Steven Rostedt Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/smp.c | 91 ++++++++++++++++++++++++++++++------------------------------ 1 file changed, 46 insertions(+), 45 deletions(-) (limited to 'kernel/smp.c') diff --git a/kernel/smp.c b/kernel/smp.c index b320622543e9..4dba0f7b72ad 100644 --- a/kernel/smp.c +++ b/kernel/smp.c @@ -100,16 +100,16 @@ void __init call_function_init(void) * previous function call. For multi-cpu calls its even more interesting * as we'll have to ensure no other cpu is observing our csd. */ -static void csd_lock_wait(struct call_single_data *data) +static void csd_lock_wait(struct call_single_data *csd) { - while (data->flags & CSD_FLAG_LOCK) + while (csd->flags & CSD_FLAG_LOCK) cpu_relax(); } -static void csd_lock(struct call_single_data *data) +static void csd_lock(struct call_single_data *csd) { - csd_lock_wait(data); - data->flags |= CSD_FLAG_LOCK; + csd_lock_wait(csd); + csd->flags |= CSD_FLAG_LOCK; /* * prevent CPU from reordering the above assignment @@ -119,16 +119,16 @@ static void csd_lock(struct call_single_data *data) smp_mb(); } -static void csd_unlock(struct call_single_data *data) +static void csd_unlock(struct call_single_data *csd) { - WARN_ON(!(data->flags & CSD_FLAG_LOCK)); + WARN_ON(!(csd->flags & CSD_FLAG_LOCK)); /* * ensure we're all done before releasing data: */ smp_mb(); - data->flags &= ~CSD_FLAG_LOCK; + csd->flags &= ~CSD_FLAG_LOCK; } /* @@ -137,7 +137,7 @@ static void csd_unlock(struct call_single_data *data) * ->func, ->info, and ->flags set. */ static -void generic_exec_single(int cpu, struct call_single_data *data, int wait) +void generic_exec_single(int cpu, struct call_single_data *csd, int wait) { struct call_single_queue *dst = &per_cpu(call_single_queue, cpu); unsigned long flags; @@ -145,7 +145,7 @@ void generic_exec_single(int cpu, struct call_single_data *data, int wait) raw_spin_lock_irqsave(&dst->lock, flags); ipi = list_empty(&dst->list); - list_add_tail(&data->list, &dst->list); + list_add_tail(&csd->list, &dst->list); raw_spin_unlock_irqrestore(&dst->lock, flags); /* @@ -163,7 +163,7 @@ void generic_exec_single(int cpu, struct call_single_data *data, int wait) arch_send_call_function_single_ipi(cpu); if (wait) - csd_lock_wait(data); + csd_lock_wait(csd); } /* @@ -173,7 +173,6 @@ void generic_exec_single(int cpu, struct call_single_data *data, int wait) void generic_smp_call_function_single_interrupt(void) { struct call_single_queue *q = &__get_cpu_var(call_single_queue); - unsigned int data_flags; LIST_HEAD(list); /* @@ -186,25 +185,26 @@ void generic_smp_call_function_single_interrupt(void) raw_spin_unlock(&q->lock); while (!list_empty(&list)) { - struct call_single_data *data; + struct call_single_data *csd; + unsigned int csd_flags; - data = list_entry(list.next, struct call_single_data, list); - list_del(&data->list); + csd = list_entry(list.next, struct call_single_data, list); + list_del(&csd->list); /* - * 'data' can be invalid after this call if flags == 0 + * 'csd' can be invalid after this call if flags == 0 * (when called through generic_exec_single()), * so save them away before making the call: */ - data_flags = data->flags; + csd_flags = csd->flags; - data->func(data->info); + csd->func(csd->info); /* * Unlocked CSDs are valid through generic_exec_single(): */ - if (data_flags & CSD_FLAG_LOCK) - csd_unlock(data); + if (csd_flags & CSD_FLAG_LOCK) + csd_unlock(csd); } } @@ -249,16 +249,16 @@ int smp_call_function_single(int cpu, smp_call_func_t func, void *info, local_irq_restore(flags); } else { if ((unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) { - struct call_single_data *data = &d; + struct call_single_data *csd = &d; if (!wait) - data = &__get_cpu_var(csd_data); + csd = &__get_cpu_var(csd_data); - csd_lock(data); + csd_lock(csd); - data->func = func; - data->info = info; - generic_exec_single(cpu, data, wait); + csd->func = func; + csd->info = info; + generic_exec_single(cpu, csd, wait); } else { err = -ENXIO; /* CPU not online */ } @@ -325,7 +325,7 @@ EXPORT_SYMBOL_GPL(smp_call_function_any); * pre-allocated data structure. Useful for embedding @data inside * other structures, for instance. */ -void __smp_call_function_single(int cpu, struct call_single_data *data, +void __smp_call_function_single(int cpu, struct call_single_data *csd, int wait) { unsigned int this_cpu; @@ -343,11 +343,11 @@ void __smp_call_function_single(int cpu, struct call_single_data *data, if (cpu == this_cpu) { local_irq_save(flags); - data->func(data->info); + csd->func(csd->info); local_irq_restore(flags); } else { - csd_lock(data); - generic_exec_single(cpu, data, wait); + csd_lock(csd); + generic_exec_single(cpu, csd, wait); } put_cpu(); } @@ -369,7 +369,7 @@ void __smp_call_function_single(int cpu, struct call_single_data *data, void smp_call_function_many(const struct cpumask *mask, smp_call_func_t func, void *info, bool wait) { - struct call_function_data *data; + struct call_function_data *cfd; int cpu, next_cpu, this_cpu = smp_processor_id(); /* @@ -401,24 +401,24 @@ void smp_call_function_many(const struct cpumask *mask, return; } - data = &__get_cpu_var(cfd_data); + cfd = &__get_cpu_var(cfd_data); - cpumask_and(data->cpumask, mask, cpu_online_mask); - cpumask_clear_cpu(this_cpu, data->cpumask); + cpumask_and(cfd->cpumask, mask, cpu_online_mask); + cpumask_clear_cpu(this_cpu, cfd->cpumask); /* Some callers race with other cpus changing the passed mask */ - if (unlikely(!cpumask_weight(data->cpumask))) + if (unlikely(!cpumask_weight(cfd->cpumask))) return; /* - * After we put an entry into the list, data->cpumask - * may be cleared again when another CPU sends another IPI for - * a SMP function call, so data->cpumask will be zero. + * After we put an entry into the list, cfd->cpumask may be cleared + * again when another CPU sends another IPI for a SMP function call, so + * cfd->cpumask will be zero. */ - cpumask_copy(data->cpumask_ipi, data->cpumask); + cpumask_copy(cfd->cpumask_ipi, cfd->cpumask); - for_each_cpu(cpu, data->cpumask) { - struct call_single_data *csd = per_cpu_ptr(data->csd, cpu); + for_each_cpu(cpu, cfd->cpumask) { + struct call_single_data *csd = per_cpu_ptr(cfd->csd, cpu); struct call_single_queue *dst = &per_cpu(call_single_queue, cpu); unsigned long flags; @@ -433,12 +433,13 @@ void smp_call_function_many(const struct cpumask *mask, } /* Send a message to all CPUs in the map */ - arch_send_call_function_ipi_mask(data->cpumask_ipi); + arch_send_call_function_ipi_mask(cfd->cpumask_ipi); if (wait) { - for_each_cpu(cpu, data->cpumask) { - struct call_single_data *csd = - per_cpu_ptr(data->csd, cpu); + for_each_cpu(cpu, cfd->cpumask) { + struct call_single_data *csd; + + csd = per_cpu_ptr(cfd->csd, cpu); csd_lock_wait(csd); } } -- cgit v1.2.3