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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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