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Viewing changes to arch/x86/kernel/process_32.c

  • Committer: Bazaar Package Importer
  • Author(s): Bryan Wu, Bryan Wu
  • Date: 2011-04-04 21:33:36 UTC
  • Revision ID: james.westby@ubuntu.com-20110404213336-qav5h157bnma7eye
Tags: 2.6.38-1208.11
[ Bryan Wu ]

* [Config] Update to 2.6.38.2 kernel config and other changes
* SAUCE (no-up) trace: fix compiling error
* Rebased to 2.6.38.2 based Linaro kernel release
* Updates WLAN/BT/FM/Audio supporting from Andy Green and Sebastien Jan
  (u0 tag of for-ubuntu branch in Andy's tree)
* Rebased to Ubuntu master branch from 2.6.38-7.38 to 2.6.38-8.40

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arch/x86/kernel/process_32.c
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#include <linux/uaccess.h>
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#include <linux/io.h>
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#include <linux/kdebug.h>
 
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#include <linux/notifier.h>
 
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#include <linux/idle.h>
 
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#include <trace/pm.h>
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#include <asm/pgtable.h>
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#include <asm/system.h>
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asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
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DEFINE_TRACE(pm_idle_exit);
 
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DEFINE_TRACE(pm_idle_entry);
 
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static DEFINE_PER_CPU(unsigned char, is_idle);
 
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void enter_idle(void)
 
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{
 
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        percpu_write(is_idle, 1);
 
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        trace_pm_idle_entry();
 
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        notify_idle(IDLE_START);
 
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}
 
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EXPORT_SYMBOL_GPL(enter_idle);
 
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void __exit_idle(void)
 
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{
 
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        if (x86_test_and_clear_bit_percpu(0, is_idle) == 0)
 
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                return;
 
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        notify_idle(IDLE_END);
 
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        trace_pm_idle_exit();
 
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}
 
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EXPORT_SYMBOL_GPL(__exit_idle);
 
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/* Called from interrupts to signify idle end */
 
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void exit_idle(void)
 
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{
 
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        /* idle loop has pid 0 */
 
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        if (current->pid)
 
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                return;
 
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        __exit_idle();
 
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}
 
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EXPORT_SYMBOL_GPL(exit_idle);
 
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/*
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 * Return saved PC of a blocked thread.
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 */
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                                play_dead();
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                        local_irq_disable();
 
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                        enter_idle();
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                        /* Don't trace irqs off for idle */
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                        stop_critical_timings();
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                        pm_idle();
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                        start_critical_timings();
 
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                        /*
 
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                         * In many cases the interrupt that ended idle
 
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                         * has already called exit_idle. But some idle
 
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                         * loops can be woken up without interrupt.
 
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                         */
 
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                        __exit_idle();
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                }
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                tick_nohz_restart_sched_tick();
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                preempt_enable_no_resched();