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    Subject[tip:timers/core] time: Provide xtime_update()
    Commit-ID:  f0af911a9dec9de702645182c8d269449e24d24b
    Gitweb: http://git.kernel.org/tip/f0af911a9dec9de702645182c8d269449e24d24b
    Author: Torben Hohn <torbenh@gmx.de>
    AuthorDate: Thu, 27 Jan 2011 15:59:10 +0100
    Committer: Thomas Gleixner <tglx@linutronix.de>
    CommitDate: Mon, 31 Jan 2011 14:55:43 +0100

    time: Provide xtime_update()

    xtime_update() takes xtime_lock write locked and calls
    do_timer(). Provided to replace the do_timer() calls in the
    architecture code.

    Signed-off-by: Torben Hohn <torbenh@gmx.de>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: johnstul@us.ibm.com
    Cc: yong.zhang0@gmail.com
    Cc: hch@infradead.org
    LKML-Reference: <20110127145910.23248.21379.stgit@localhost>
    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    ---
    include/linux/sched.h | 1 +
    kernel/time/timekeeping.c | 13 +++++++++++++
    2 files changed, 14 insertions(+), 0 deletions(-)

    diff --git a/include/linux/sched.h b/include/linux/sched.h
    index d747f94..9d9a078 100644
    --- a/include/linux/sched.h
    +++ b/include/linux/sched.h
    @@ -2050,6 +2050,7 @@ extern void release_uids(struct user_namespace *ns);
    #include <asm/current.h>

    extern void do_timer(unsigned long ticks);
    +extern void xtime_update(unsigned long ticks);

    extern int wake_up_state(struct task_struct *tsk, unsigned int state);
    extern int wake_up_process(struct task_struct *tsk);
    diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
    index 8da35d1..02c13a3 100644
    --- a/kernel/time/timekeeping.c
    +++ b/kernel/time/timekeeping.c
    @@ -969,3 +969,16 @@ void get_xtime_and_monotonic_offset(struct timespec *xtim, struct timespec *wtom
    *wtom = wall_to_monotonic;
    } while (read_seqretry(&xtime_lock, seq));
    }
    +
    +/**
    + * xtime_update() - advances the timekeeping infrastructure
    + * @ticks: number of ticks, that have elapsed since the last call.
    + *
    + * Must be called with interrupts disabled.
    + */
    +void xtime_update(unsigned long ticks)
    +{
    + write_seqlock(&xtime_lock);
    + do_timer(ticks);
    + write_sequnlock(&xtime_lock);
    +}

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