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    Subject[patch 04/20] idle notifier standardization x86_32
    Add idle notifier callback to x86_32.

    Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
    ---
    arch/x86/include/asm/idle.h | 5 -----
    arch/x86/kernel/apm_32.c | 6 ++++++
    arch/x86/kernel/process_32.c | 33 +++++++++++++++++++++++++++++++++
    3 files changed, 39 insertions(+), 5 deletions(-)

    Index: linux.trees.git/arch/x86/kernel/process_32.c
    ===================================================================
    --- linux.trees.git.orig/arch/x86/kernel/process_32.c 2010-06-19 16:09:48.000000000 -0400
    +++ linux.trees.git/arch/x86/kernel/process_32.c 2010-06-19 16:16:53.000000000 -0400
    @@ -38,6 +38,8 @@
    #include <linux/uaccess.h>
    #include <linux/io.h>
    #include <linux/kdebug.h>
    +#include <linux/notifier.h>
    +#include <linux/idle.h>

    #include <asm/pgtable.h>
    #include <asm/system.h>
    @@ -61,6 +63,30 @@

    asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");

    +static DEFINE_PER_CPU(unsigned char, is_idle);
    +
    +void enter_idle(void)
    +{
    + percpu_write(is_idle, 1);
    + notify_idle(IDLE_START);
    +}
    +
    +static void __exit_idle(void)
    +{
    + if (x86_test_and_clear_bit_percpu(0, is_idle) == 0)
    + return;
    + notify_idle(IDLE_END);
    +}
    +
    +/* Called from interrupts to signify idle end */
    +void exit_idle(void)
    +{
    + /* idle loop has pid 0 */
    + if (current->pid)
    + return;
    + __exit_idle();
    +}
    +
    /*
    * Return saved PC of a blocked thread.
    */
    @@ -109,10 +135,17 @@ void cpu_idle(void)
    play_dead();

    local_irq_disable();
    + enter_idle();
    /* Don't trace irqs off for idle */
    stop_critical_timings();
    pm_idle();
    start_critical_timings();
    + /*
    + * In many cases the interrupt that ended idle
    + * has already called exit_idle. But some idle loops can
    + * be woken up without interrupt.
    + */
    + __exit_idle();

    trace_power_end(smp_processor_id());
    }
    Index: linux.trees.git/arch/x86/include/asm/idle.h
    ===================================================================
    --- linux.trees.git.orig/arch/x86/include/asm/idle.h 2010-06-19 16:15:29.000000000 -0400
    +++ linux.trees.git/arch/x86/include/asm/idle.h 2010-06-19 16:15:34.000000000 -0400
    @@ -1,13 +1,8 @@
    #ifndef _ASM_X86_IDLE_H
    #define _ASM_X86_IDLE_H

    -#ifdef CONFIG_X86_64
    void enter_idle(void);
    void exit_idle(void);
    -#else /* !CONFIG_X86_64 */
    -static inline void enter_idle(void) { }
    -static inline void exit_idle(void) { }
    -#endif /* CONFIG_X86_64 */

    void c1e_remove_cpu(int cpu);

    Index: linux.trees.git/arch/x86/kernel/apm_32.c
    ===================================================================
    --- linux.trees.git.orig/arch/x86/kernel/apm_32.c 2010-06-19 16:08:32.000000000 -0400
    +++ linux.trees.git/arch/x86/kernel/apm_32.c 2010-06-19 16:15:34.000000000 -0400
    @@ -227,6 +227,7 @@
    #include <linux/suspend.h>
    #include <linux/kthread.h>
    #include <linux/jiffies.h>
    +#include <linux/idle.h>

    #include <asm/system.h>
    #include <asm/uaccess.h>
    @@ -947,10 +948,15 @@ recalc:
    break;
    }
    }
    + enter_idle();
    if (original_pm_idle)
    original_pm_idle();
    else
    default_idle();
    + /* In many cases the interrupt that ended idle
    + has already called exit_idle. But some idle
    + loops can be woken up without interrupt. */
    + __exit_idle();
    local_irq_disable();
    jiffies_since_last_check = jiffies - last_jiffies;
    if (jiffies_since_last_check > idle_period)


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