diff options
| author | Ingo Molnar <mingo@elte.hu> | 2009-07-03 13:30:12 (GMT) |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2014-04-10 00:19:04 (GMT) |
| commit | 2451925754ad11895bea6ad37dc13942b04641a8 (patch) | |
| tree | 838ff440253179991a531cbec58d2882a586c00d /ipc/mqueue.c | |
| parent | 1ba2a0b1f0b6ec80afc57debe8c46c42df9c78e2 (diff) | |
| download | linux-fsl-qoriq-2451925754ad11895bea6ad37dc13942b04641a8.tar.xz | |
ipc: Make the ipc code -rt aware
RT serializes the code with the (rt)spinlock but keeps preemption
enabled. Some parts of the code need to be atomic nevertheless.
Protect it with preempt_disable/enable_rt pairts.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'ipc/mqueue.c')
| -rw-r--r-- | ipc/mqueue.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/ipc/mqueue.c b/ipc/mqueue.c index bb0248f..af0c6bb 100644 --- a/ipc/mqueue.c +++ b/ipc/mqueue.c @@ -923,12 +923,17 @@ static inline void pipelined_send(struct mqueue_inode_info *info, struct msg_msg *message, struct ext_wait_queue *receiver) { + /* + * Keep them in one critical section for PREEMPT_RT: + */ + preempt_disable_rt(); receiver->msg = message; list_del(&receiver->list); receiver->state = STATE_PENDING; wake_up_process(receiver->task); smp_wmb(); receiver->state = STATE_READY; + preempt_enable_rt(); } /* pipelined_receive() - if there is task waiting in sys_mq_timedsend() |