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    Subject[patch-mm 25/33] x86_64: prepare idle loop for dynamic ticks
    From: Chris Wright <chrisw@sous-sol.org>

    Add tick_nohz_{stop,restart}_sched_tick to idle loop in prepartion for turning
    on dynticks. These are just noops until NO_HZ is enabled.

    Signed-off-by: Chris Wright <chrisw@sous-sol.org>
    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Signed-off-by: Ingo Molnar <mingo@elte.hu>

    ---

    arch/x86_64/kernel/process.c | 3 +++
    1 file changed, 3 insertions(+)

    Index: linux-2.6.22-rc6-mm/arch/x86_64/kernel/process.c
    ===================================================================
    --- linux-2.6.22-rc6-mm.orig/arch/x86_64/kernel/process.c 2007-07-15 17:01:24.000000000 +0200
    +++ linux-2.6.22-rc6-mm/arch/x86_64/kernel/process.c 2007-07-15 17:42:36.000000000 +0200
    @@ -37,6 +37,7 @@
    #include <linux/notifier.h>
    #include <linux/kprobes.h>
    #include <linux/kdebug.h>
    +#include <linux/tick.h>

    #include <asm/uaccess.h>
    #include <asm/pgtable.h>
    @@ -208,6 +209,7 @@ void cpu_idle (void)
    __get_cpu_var(cpu_idle_state) = 0;

    check_pgt_cache();
    + tick_nohz_stop_sched_tick();
    rmb();
    idle = pm_idle;
    if (!idle)
    @@ -228,6 +230,7 @@ void cpu_idle (void)
    __exit_idle();
    }

    + tick_nohz_restart_sched_tick();
    preempt_enable_no_resched();
    schedule();
    preempt_disable();
    --

    -
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