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    Subject[tip:timers/core] mn10300: Switch do_timer() to xtimer_update()
    Commit-ID:  22b7fcdae562b6792b3f5517e89fd7e0337180ae
    Gitweb: http://git.kernel.org/tip/22b7fcdae562b6792b3f5517e89fd7e0337180ae
    Author: Torben Hohn <torbenh@gmx.de>
    AuthorDate: Thu, 27 Jan 2011 16:00:12 +0100
    Committer: Thomas Gleixner <tglx@linutronix.de>
    CommitDate: Wed, 9 Feb 2011 16:17:24 +0100

    mn10300: Switch do_timer() to xtimer_update()

    Only one CPU gets the timer interrupt so mn10300_last_tsc does not
    need to be protected by xtime lock. Remove xtime lovking and use
    xtime_update() which does the locking itself.

    Signed-off-by: Torben Hohn <torbenh@gmx.de>
    Cc: David Howells <dhowells@redhat.com>
    Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
    LKML-Reference: <20110127150011.23248.62040.stgit@localhost>
    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    ---
    arch/mn10300/kernel/time.c | 6 +-----
    1 files changed, 1 insertions(+), 5 deletions(-)

    diff --git a/arch/mn10300/kernel/time.c b/arch/mn10300/kernel/time.c
    index 75da468..5b95500 100644
    --- a/arch/mn10300/kernel/time.c
    +++ b/arch/mn10300/kernel/time.c
    @@ -104,8 +104,6 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
    unsigned tsc, elapse;
    irqreturn_t ret;

    - write_seqlock(&xtime_lock);
    -
    while (tsc = get_cycles(),
    elapse = tsc - mn10300_last_tsc, /* time elapsed since last
    * tick */
    @@ -114,11 +112,9 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
    mn10300_last_tsc += MN10300_TSC_PER_HZ;

    /* advance the kernel's time tracking system */
    - do_timer(1);
    + xtime_update(1);
    }

    - write_sequnlock(&xtime_lock);
    -
    ret = local_timer_interrupt();
    #ifdef CONFIG_SMP
    send_IPI_allbutself(LOCAL_TIMER_IPI);

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