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authorRichard Cochran <richardcochran@gmail.com>2011-02-01 13:52:35 +0000
committerThomas Gleixner <tglx@linutronix.de>2011-02-02 15:28:20 +0100
commit0606f422b453f76c31ab2b1bd52943ff06a2dcf2 (patch)
tree14f4859e8492f01e97140248a28ab98355c415cf /kernel/posix-timers.c
parent527087374faa488776a789375a7d6ea74fda6f71 (diff)
downloadlinux-0606f422b453f76c31ab2b1bd52943ff06a2dcf2.tar.bz2
posix clocks: Introduce dynamic clocks
This patch adds support for adding and removing posix clocks. The clock lifetime cycle is patterned after usb devices. Each clock is represented by a standard character device. In addition, the driver may optionally implement custom character device operations. The posix clock and timer system calls listed below now work with dynamic posix clocks, as well as the traditional static clocks. The following system calls are affected: - clock_adjtime (brand new syscall) - clock_gettime - clock_getres - clock_settime - timer_create - timer_delete - timer_gettime - timer_settime [ tglx: Adapted to the posix-timer cleanup. Moved clock_posix_dynamic to posix-clock.c and made all referenced functions static ] Signed-off-by: Richard Cochran <richard.cochran@omicron.at> Acked-by: John Stultz <johnstul@us.ibm.com> LKML-Reference: <20110201134420.164172635@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/posix-timers.c')
-rw-r--r--kernel/posix-timers.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index af936fd37140..44fcff131b38 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -41,6 +41,7 @@
#include <linux/init.h>
#include <linux/compiler.h>
#include <linux/idr.h>
+#include <linux/posix-clock.h>
#include <linux/posix-timers.h>
#include <linux/syscalls.h>
#include <linux/wait.h>
@@ -489,7 +490,8 @@ static void release_posix_timer(struct k_itimer *tmr, int it_id_set)
static struct k_clock *clockid_to_kclock(const clockid_t id)
{
if (id < 0)
- return (id & CLOCKFD_MASK) == CLOCKFD ? NULL : &clock_posix_cpu;
+ return (id & CLOCKFD_MASK) == CLOCKFD ?
+ &clock_posix_dynamic : &clock_posix_cpu;
if (id >= MAX_CLOCKS || !posix_clocks[id].clock_getres)
return NULL;