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authorJohn Stultz <john.stultz@linaro.org>2014-03-27 16:30:49 -0700
committerIngo Molnar <mingo@kernel.org>2014-03-28 08:07:07 +0100
commitcab5e127eef040399902caa8e1510795583fa03a (patch)
tree9e9a5713d4d58ffafea24354537e8207bd013c7e
parent75c5a52da3fc2a06abb6c6192bdf5d680e56d37d (diff)
downloadlinux-linaro-stable-cab5e127eef040399902caa8e1510795583fa03a.tar.gz
time: Revert to calling clock_was_set_delayed() while in irq context
In commit 47a1b796306356f35 ("tick/timekeeping: Call update_wall_time outside the jiffies lock"), we moved to calling clock_was_set() due to the fact that we were no longer holding the timekeeping or jiffies lock. However, there is still the problem that clock_was_set() triggers an IPI, which cannot be done from the timer's hard irq context, and will generate WARN_ON warnings. Apparently in my earlier testing, I'm guessing I didn't bump the dmesg log level, so I somehow missed the WARN_ONs. Thus we need to revert back to calling clock_was_set_delayed(). Signed-off-by: John Stultz <john.stultz@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/1395963049-11923-1-git-send-email-john.stultz@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
-rw-r--r--kernel/time/timekeeping.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 0aa4ce81bc16..5b40279ecd71 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -1435,7 +1435,8 @@ void update_wall_time(void)
out:
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
if (clock_set)
- clock_was_set();
+ /* Have to call _delayed version, since in irq context*/
+ clock_was_set_delayed();
}
/**