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

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Pull timer fix from Ingo Molnar:
 "An NTP related lockup fix"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  timekeeping: Fix HRTICK related deadlock from ntp lock changes
This commit is contained in:
Linus Torvalds 2013-09-18 11:24:49 -05:00
commit 9d2cd7048b
3 changed files with 5 additions and 4 deletions
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1
include/linux/timex.h
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@ -141,6 +141,7 @@ extern int do_adjtimex(struct timex *);
extern void hardpps(const struct timespec *, const struct timespec *);
int read_current_timer(unsigned long *timer_val);
void ntp_notify_cmos_timer(void);
/* The clock frequency of the i8253/i8254 PIT */
#define PIT_TICK_RATE 1193182ul

6
kernel/time/ntp.c
View file

@ -516,13 +516,13 @@ static void sync_cmos_clock(struct work_struct *work)
schedule_delayed_work(&sync_cmos_work, timespec_to_jiffies(&next));
}
static void notify_cmos_timer(void)
void ntp_notify_cmos_timer(void)
{
schedule_delayed_work(&sync_cmos_work, 0);
}
#else
static inline void notify_cmos_timer(void) { }
void ntp_notify_cmos_timer(void) { }
#endif
@ -687,8 +687,6 @@ int __do_adjtimex(struct timex *txc, struct timespec *ts, s32 *time_tai)
if (!(time_status & STA_NANO))
txc->time.tv_usec /= NSEC_PER_USEC;
notify_cmos_timer();
return result;
}

2
kernel/time/timekeeping.c
View file

@ -1703,6 +1703,8 @@ int do_adjtimex(struct timex *txc)
write_seqcount_end(&timekeeper_seq);
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
ntp_notify_cmos_timer();
return ret;
}