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From: Mark Rutland <mark.rutland@arm.com>
To: John Stultz <john.stultz@linaro.org>,
	Cyril Hrubis <chrubis@suse.cz>, Wang YanQing <udknight@gmail.com>
Cc: ltp@lists.linux.it, will.deacon@arm.com, linux-kernel@vger.kernel.org
Subject: LTP and commit e1d7ba8735551ed7 ("time: Always make sure wall_to_monotonic isn't positive")
Date: Mon, 14 Sep 2015 14:46:05 +0100	[thread overview]
Message-ID: <20150914134603.GD7002@leverpostej> (raw)

Hi,

While testing v4.3-rc1 with the LTP, we spotted failures in a couple of
timekeeping tests, which seem to be a result of commit e1d7ba8735551ed7
("time: Always make sure wall_to_monotonic isn't positive").

In both cases this is because the new time would be before the boot
time, so I guess these are covered by the caveat at the end of the
commit message.

settimeofday01 [1] tries tries to settimeofday() with a timeval 100s and
100ns, while clock_gettime02 [2] tries to clock_settime to 1s and
100ns. Neither expect -EINVAL, and report failure with the new
behaviour.

While I don't know that any "real" software is affected, I thought I
should let you know.

Thanks,
Mark.

[1] https://github.com/linux-test-project/ltp/blob/20150903/testcases/kernel/syscalls/settimeofday/settimeofday01.c
[2] https://github.com/linux-test-project/ltp/blob/20150903/testcases/kernel/timers/clock_settime/clock_settime02.c

             reply	other threads:[~2015-09-14 13:46 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-09-14 13:46 Mark Rutland [this message]
2015-09-15  8:37 ` LTP and commit e1d7ba8735551ed7 ("time: Always make sure wall_to_monotonic isn't positive") Cyril Hrubis
2015-09-24 14:51   ` [LTP] " Cyril Hrubis

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