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Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

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* 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  posix_timer: Fix error path in timer_create
  hrtimer: Avoid double seqlock
  timers: Move local variable into else section
  timers: Fix slack calculation really
This commit is contained in:
Linus Torvalds 2010-05-28 10:16:27 -07:00
commit 29d03fa12b
3 changed files with 12 additions and 11 deletions
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2
kernel/hrtimer.c
View file

@ -89,7 +89,7 @@ static void hrtimer_get_softirq_time(struct hrtimer_cpu_base *base)
do {
seq = read_seqbegin(&xtime_lock);
xts = current_kernel_time();
xts = __current_kernel_time();
tom = wall_to_monotonic;
} while (read_seqretry(&xtime_lock, seq));

11
kernel/posix-timers.c
View file

@ -559,14 +559,7 @@ SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock,
new_timer->it_id = (timer_t) new_timer_id;
new_timer->it_clock = which_clock;
new_timer->it_overrun = -1;
error = CLOCK_DISPATCH(which_clock, timer_create, (new_timer));
if (error)
goto out;
/*
* return the timer_id now. The next step is hard to
* back out if there is an error.
*/
if (copy_to_user(created_timer_id,
&new_timer_id, sizeof (new_timer_id))) {
error = -EFAULT;
@ -597,6 +590,10 @@ SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock,
new_timer->sigq->info.si_tid = new_timer->it_id;
new_timer->sigq->info.si_code = SI_TIMER;
error = CLOCK_DISPATCH(which_clock, timer_create, (new_timer));
if (error)
goto out;
spin_lock_irq(&current->sighand->siglock);
new_timer->it_signal = current->signal;
list_add(&new_timer->list, &current->signal->posix_timers);

10
kernel/timer.c
View file

@ -752,11 +752,15 @@ unsigned long apply_slack(struct timer_list *timer, unsigned long expires)
expires_limit = expires;
if (timer->slack > -1)
if (timer->slack >= 0) {
expires_limit = expires + timer->slack;
else if (time_after(expires, jiffies)) /* auto slack: use 0.4% */
expires_limit = expires + (expires - jiffies)/256;
} else {
unsigned long now = jiffies;
/* No slack, if already expired else auto slack 0.4% */
if (time_after(expires, now))
expires_limit = expires + (expires - now)/256;
}
mask = expires ^ expires_limit;
if (mask == 0)
return expires;