posix-timers: Add support for fd based clocks

Extend the negative clockids which are currently used by posix cpu
timers to encode the PID with a file descriptor based type which
encodes the fd in the upper bits.

Originally-from: Richard Cochran <richard.cochran@omicron.at>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: John Stultz <johnstul@us.ibm.com>
LKML-Reference: <20110201134420.062860200@linutronix.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 5a5a4f1c0971..df629d853a81 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -488,7 +488,7 @@ 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 &clock_posix_cpu;
+                return (id & CLOCKFD_MASK) == CLOCKFD ? NULL : &clock_posix_cpu;
 
         if (id >= MAX_CLOCKS || !posix_clocks[id].clock_getres)
                 return NULL;