linux-kernel - [tip:timers/core] posix-timers: Introduce clockid_to

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Date:	Wed, 2 Feb 2011 21:56:37 GMT
From:	tip-bot for Thomas Gleixner <tglx@...utronix.de>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	johnstul@...ibm.com, tglx@...utronix.de, richard.cochran@...cron.at
Subject: [tip:timers/core] posix-timers: Introduce clockid_to_kclock()

Commit-ID:  cc785ac22b17ed53e8ff5c1501e422be6d10be3c
Gitweb:     http://git.kernel.org/tip/cc785ac22b17ed53e8ff5c1501e422be6d10be3c
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Tue, 1 Feb 2011 13:51:09 +0000
Committer:  Thomas Gleixner <tglx@...utronix.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@...utronix.de>
Cc: John Stultz <johnstul@...ibm.com>
Acked-by: Richard Cochran <richard.cochran@...cron.at>
LKML-Reference: <20110201134417.938447839@...utronix.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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