* Tetsuo Handa <penguin-ker...@i-love.sakura.ne.jp> wrote:
> Hello.
>
> Bisected to 2a8c0883 "time: Move xtime_nsec adjustment
> underflow handling timekeeping_adjust".
>
> Would you check?
probably caused by this stray return in timekeeping_adjust():
} else
return;
which should really be a proper goto - like the (totally
untested!) patch below.
Does this fix the bug for you?
Thanks,
Ingo
-------------
Subject: time: Fix adjustment cleanup bug in timekeeping_adjust()
Also make the flow more readable by properly balancing curly
braces.
Signed-off-by: Ingo Molnar <mi...@kernel.org>
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 2988bc8..e16af19 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -923,20 +923,22 @@ static void timekeeping_adjust(struct timekeeper *tk, s64
offset)
if (likely(error <= interval))
adj = 1;
else
- adj = timekeeping_bigadjust(tk, error, &interval,
- &offset);
- } else if (error < -interval) {
- /* See comment above, this is just switched for the negative */
- error >>= 2;
- if (likely(error >= -interval)) {
- adj = -1;
- interval = -interval;
- offset = -offset;
- } else
- adj = timekeeping_bigadjust(tk, error, &interval,
- &offset);
- } else
- return;
+ adj = timekeeping_bigadjust(tk, error, &interval,
&offset);
+ } else {
+ if (error < -interval) {
+ /* See comment above, this is just switched for the
negative */
+ error >>= 2;
+ if (likely(error >= -interval)) {
+ adj = -1;
+ interval = -interval;
+ offset = -offset;
+ } else {
+ adj = timekeeping_bigadjust(tk, error,
&interval, &offset);
+ }
+ } else {
+ goto out_adjust;
+ }
+ }
if (unlikely(tk->clock->maxadj &&
(tk->mult + adj > tk->clock->mult + tk->clock->maxadj))) {
@@ -999,6 +1001,7 @@ static void timekeeping_adjust(struct timekeeper *tk, s64
offset)
tk->xtime_nsec -= offset;
tk->ntp_error -= (interval - offset) << tk->ntp_error_shift;
+out_adjust:
/*
* It may be possible that when we entered this function, xtime_nsec
* was very small. Further, if we're slightly speeding the clocksource
--
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