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authorJohn Stultz <john.stultz@linaro.org>2015-02-04 16:45:26 -0800
committerIngo Molnar <mingo@kernel.org>2015-02-05 08:39:37 +0100
commit2d926c15d629a13914ce3e5f26354f6a0ac99e70 (patch)
tree994bad6dd380a02a39e0c3aecab87f862de8bc5e /kernel
parentdc6d6844111d953d3fa2121da28d38be9359c911 (diff)
downloadlinux-2d926c15d629a13914ce3e5f26354f6a0ac99e70.tar.bz2
hrtimer: Fix incorrect tai offset calculation for non high-res timer systems
I noticed some CLOCK_TAI timer test failures on one of my less-frequently used configurations. And after digging in I found in 76f4108892d9 (Cleanup hrtimer accessors to the timekepeing state), the hrtimer_get_softirq_time tai offset calucation was incorrectly rewritten, as the tai offset we return shold be from CLOCK_MONOTONIC, and not CLOCK_REALTIME. This results in CLOCK_TAI timers expiring early on non-highres capable machines. This patch fixes the issue, calculating the tai time properly from the monotonic base. Signed-off-by: John Stultz <john.stultz@linaro.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: stable <stable@vger.kernel.org> # 3.17+ Link: http://lkml.kernel.org/r/1423097126-10236-1-git-send-email-john.stultz@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/time/hrtimer.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index 37e50aadd471..d8c724cda37b 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -122,7 +122,7 @@ static void hrtimer_get_softirq_time(struct hrtimer_cpu_base *base)
mono = ktime_get_update_offsets_tick(&off_real, &off_boot, &off_tai);
boot = ktime_add(mono, off_boot);
xtim = ktime_add(mono, off_real);
- tai = ktime_add(xtim, off_tai);
+ tai = ktime_add(mono, off_tai);
base->clock_base[HRTIMER_BASE_REALTIME].softirq_time = xtim;
base->clock_base[HRTIMER_BASE_MONOTONIC].softirq_time = mono;