/* * SMP stuff which is common to all sub-architectures. */ #include <linux/module.h> #include <asm/smp.h> DEFINE_PER_CPU(unsigned long, this_cpu_off); EXPORT_PER_CPU_SYMBOL(this_cpu_off); /* Initialize the CPU's GDT. This is either the boot CPU doing itself (still using the master per-cpu area), or a CPU doing it for a secondary which will soon come up. */ __cpuinit void init_gdt(int cpu) { struct desc_struct *gdt = get_cpu_gdt_table(cpu); pack_descriptor((u32 *)&gdt[GDT_ENTRY_PERCPU].a, (u32 *)&gdt[GDT_ENTRY_PERCPU].b, __per_cpu_offset[cpu], 0xFFFFF, 0x80 | DESCTYPE_S | 0x2, 0x8); per_cpu(this_cpu_off, cpu) = __per_cpu_offset[cpu]; per_cpu(cpu_number, cpu) = cpu; } /** * smp_call_function(): Run a function on all other CPUs. * @func: The function to run. This must be fast and non-blocking. * @info: An arbitrary pointer to pass to the function. * @nonatomic: Unused. * @wait: If true, wait (atomically) until function has completed on other CPUs. * * Returns 0 on success, else a negative status code. * * If @wait is true, then returns once @func has returned; otherwise * it returns just before the target cpu calls @func. * * You must not call this function with disabled interrupts or from a * hardware interrupt handler or from a bottom half handler. */ int smp_call_function(void (*func) (void *info), void *info, int nonatomic, int wait) { return smp_call_function_mask(cpu_online_map, func, info, wait); } EXPORT_SYMBOL(smp_call_function); /** * smp_call_function_single - Run a function on another CPU * @cpu: The target CPU. Cannot be the calling CPU. * @func: The function to run. This must be fast and non-blocking. * @info: An arbitrary pointer to pass to the function. * @nonatomic: Unused. * @wait: If true, wait until function has completed on other CPUs. * * Returns 0 on success, else a negative status code. * * If @wait is true, then returns once @func has returned; otherwise * it returns just before the target cpu calls @func. */ int smp_call_function_single(int cpu, void (*func) (void *info), void *info, int nonatomic, int wait) { /* prevent preemption and reschedule on another processor */ int ret; int me = get_cpu(); if (cpu == me) { WARN_ON(1); put_cpu(); return -EBUSY; } ret = smp_call_function_mask(cpumask_of_cpu(cpu), func, info, wait); put_cpu(); return ret; } EXPORT_SYMBOL(smp_call_function_single);