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authorCarsten Emde <C.Emde@osadl.org>2010-04-02 22:40:20 +0200
committerThomas Gleixner <tglx@linutronix.de>2010-04-07 15:33:38 +0200
commitb2c877a071309fcd610db0de71a40375b295f141 (patch)
tree3986545c2efee12fb19c0a2c5ec51a452a771e95
parent3c3016f722b1d18ef73676f115cd1287e02f0b61 (diff)
mqueue: Convert message queue timeout to use hrtimers
The message queue functions mq_timedsend() and mq_timedreceive() have not yet been converted to use the hrtimer interface. This patch replaces the call to schedule_timeout() by a call to schedule_hrtimeout() and transforms the expiration time from timespec to ktime as required. [ tglx: Fixed whitespace wreckage ] Signed-off-by: Carsten Emde <C.Emde@osadl.org> Tested-by: Pradyumna Sampath <pradysam@gmail.com> Cc: Arjan van de Veen <arjan@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> LKML-Reference: <20100402204331.715783034@osadl.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
-rw-r--r--ipc/mqueue.c74
1 files changed, 25 insertions, 49 deletions
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 60d4df2e717b..01582e5fe998 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -428,7 +428,7 @@ static void wq_add(struct mqueue_inode_info *info, int sr,
* sr: SEND or RECV
*/
static int wq_sleep(struct mqueue_inode_info *info, int sr,
- long timeout, struct ext_wait_queue *ewp)
+ ktime_t *timeout, struct ext_wait_queue *ewp)
{
int retval;
signed long time;
@@ -439,7 +439,8 @@ static int wq_sleep(struct mqueue_inode_info *info, int sr,
set_current_state(TASK_INTERRUPTIBLE);
spin_unlock(&info->lock);
- time = schedule_timeout(timeout);
+ time = schedule_hrtimeout_range_clock(timeout,
+ HRTIMER_MODE_ABS, 0, CLOCK_REALTIME);
while (ewp->state == STATE_PENDING)
cpu_relax();
@@ -551,31 +552,16 @@ static void __do_notify(struct mqueue_inode_info *info)
wake_up(&info->wait_q);
}
-static long prepare_timeout(struct timespec *p)
+static int prepare_timeout(const struct timespec __user *u_abs_timeout,
+ ktime_t *expires, struct timespec *ts)
{
- struct timespec nowts;
- long timeout;
-
- if (p) {
- if (unlikely(p->tv_nsec < 0 || p->tv_sec < 0
- || p->tv_nsec >= NSEC_PER_SEC))
- return -EINVAL;
- nowts = CURRENT_TIME;
- /* first subtract as jiffies can't be too big */
- p->tv_sec -= nowts.tv_sec;
- if (p->tv_nsec < nowts.tv_nsec) {
- p->tv_nsec += NSEC_PER_SEC;
- p->tv_sec--;
- }
- p->tv_nsec -= nowts.tv_nsec;
- if (p->tv_sec < 0)
- return 0;
-
- timeout = timespec_to_jiffies(p) + 1;
- } else
- return MAX_SCHEDULE_TIMEOUT;
+ if (copy_from_user(ts, u_abs_timeout, sizeof(struct timespec)))
+ return -EFAULT;
+ if (!timespec_valid(ts))
+ return -EINVAL;
- return timeout;
+ *expires = timespec_to_ktime(*ts);
+ return 0;
}
static void remove_notification(struct mqueue_inode_info *info)
@@ -859,22 +845,21 @@ SYSCALL_DEFINE5(mq_timedsend, mqd_t, mqdes, const char __user *, u_msg_ptr,
struct ext_wait_queue *receiver;
struct msg_msg *msg_ptr;
struct mqueue_inode_info *info;
- struct timespec ts, *p = NULL;
- long timeout;
+ ktime_t expires, *timeout = NULL;
+ struct timespec ts;
int ret;
if (u_abs_timeout) {
- if (copy_from_user(&ts, u_abs_timeout,
- sizeof(struct timespec)))
- return -EFAULT;
- p = &ts;
+ int res = prepare_timeout(u_abs_timeout, &expires, &ts);
+ if (res)
+ return res;
+ timeout = &expires;
}
if (unlikely(msg_prio >= (unsigned long) MQ_PRIO_MAX))
return -EINVAL;
- audit_mq_sendrecv(mqdes, msg_len, msg_prio, p);
- timeout = prepare_timeout(p);
+ audit_mq_sendrecv(mqdes, msg_len, msg_prio, timeout ? &ts : NULL);
ret = -EBADF;
filp = fget(mqdes);
@@ -911,9 +896,6 @@ SYSCALL_DEFINE5(mq_timedsend, mqd_t, mqdes, const char __user *, u_msg_ptr,
if (filp->f_flags & O_NONBLOCK) {
spin_unlock(&info->lock);
ret = -EAGAIN;
- } else if (unlikely(timeout < 0)) {
- spin_unlock(&info->lock);
- ret = timeout;
} else {
wait.task = current;
wait.msg = (void *) msg_ptr;
@@ -946,24 +928,23 @@ SYSCALL_DEFINE5(mq_timedreceive, mqd_t, mqdes, char __user *, u_msg_ptr,
size_t, msg_len, unsigned int __user *, u_msg_prio,
const struct timespec __user *, u_abs_timeout)
{
- long timeout;
ssize_t ret;
struct msg_msg *msg_ptr;
struct file *filp;
struct inode *inode;
struct mqueue_inode_info *info;
struct ext_wait_queue wait;
- struct timespec ts, *p = NULL;
+ ktime_t expires, *timeout = NULL;
+ struct timespec ts;
if (u_abs_timeout) {
- if (copy_from_user(&ts, u_abs_timeout,
- sizeof(struct timespec)))
- return -EFAULT;
- p = &ts;
+ int res = prepare_timeout(u_abs_timeout, &expires, &ts);
+ if (res)
+ return res;
+ timeout = &expires;
}
- audit_mq_sendrecv(mqdes, msg_len, 0, p);
- timeout = prepare_timeout(p);
+ audit_mq_sendrecv(mqdes, msg_len, 0, timeout ? &ts : NULL);
ret = -EBADF;
filp = fget(mqdes);
@@ -990,11 +971,6 @@ SYSCALL_DEFINE5(mq_timedreceive, mqd_t, mqdes, char __user *, u_msg_ptr,
if (filp->f_flags & O_NONBLOCK) {
spin_unlock(&info->lock);
ret = -EAGAIN;
- msg_ptr = NULL;
- } else if (unlikely(timeout < 0)) {
- spin_unlock(&info->lock);
- ret = timeout;
- msg_ptr = NULL;
} else {
wait.task = current;
wait.state = STATE_NONE;