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    Subject[tip:timers/core] posix-timers: Introduce clockid_to_kclock()
    Commit-ID:  cc785ac22b17ed53e8ff5c1501e422be6d10be3c
    Gitweb: http://git.kernel.org/tip/cc785ac22b17ed53e8ff5c1501e422be6d10be3c
    Author: Thomas Gleixner <tglx@linutronix.de>
    AuthorDate: Tue, 1 Feb 2011 13:51:09 +0000
    Committer: Thomas Gleixner <tglx@linutronix.de>
    CommitDate: Wed, 2 Feb 2011 15:28:12 +0100

    posix-timers: Introduce clockid_to_kclock()

    New function to find the kclock for a given clockid.

    Returns a pointer to clock_posix_cpu if clockid < 0. If clockid >=
    MAXCLOCK or if the clock_getres pointer is not set it returns
    NULL. For valid clocks it returns a pointer to the matching
    posix_clock.

    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Cc: John Stultz <johnstul@us.ibm.com>
    Acked-by: Richard Cochran <richard.cochran@omicron.at>
    LKML-Reference: <20110201134417.938447839@linutronix.de>
    ---
    kernel/posix-timers.c | 10 ++++++++++
    1 files changed, 10 insertions(+), 0 deletions(-)

    diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
    index e7d26af..14b0a70 100644
    --- a/kernel/posix-timers.c
    +++ b/kernel/posix-timers.c
    @@ -531,6 +531,16 @@ static void release_posix_timer(struct k_itimer *tmr, int it_id_set)
    kmem_cache_free(posix_timers_cache, tmr);
    }

    +static struct k_clock *clockid_to_kclock(const clockid_t id)
    +{
    + if (id < 0)
    + return &clock_posix_cpu;
    +
    + if (id >= MAX_CLOCKS || !posix_clocks[id].clock_getres)
    + return NULL;
    + return &posix_clocks[id];
    +}
    +
    /* Create a POSIX.1b interval timer. */

    SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock,

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