xen/common/softirq.c


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/******************************************************************************
 * common/softirq.c
 * 
 * Softirqs in Xen are only executed in an outermost activation (e.g., never 
 * within an interrupt activation). This simplifies some things and generally 
 * seems a good thing.
 * 
 * Copyright (c) 2003, K A Fraser
 * Copyright (c) 1992, Linus Torvalds
 */

#include <xen/config.h>
#include <xen/init.h>
#include <xen/mm.h>
#include <xen/sched.h>
#include <xen/rcupdate.h>
#include <xen/softirq.h>

#ifndef __ARCH_IRQ_STAT
irq_cpustat_t irq_stat[NR_CPUS];
#endif

static softirq_handler softirq_handlers[NR_SOFTIRQS];

static void __do_softirq(unsigned long ignore_mask)
{
    unsigned int i, cpu;
    unsigned long pending;

    for ( ; ; )
    {
        /*
         * Initialise @cpu on every iteration: SCHEDULE_SOFTIRQ may move
         * us to another processor.
         */
        cpu = smp_processor_id();

        if ( rcu_pending(cpu) )
            rcu_check_callbacks(cpu);