linux-kernel - Re: [PATCH v2] sched/cputime: fix clock_nanosleep/clock

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Message-ID: <20141112165610.GO29390@twins.programming.kicks-ass.net>
Date:	Wed, 12 Nov 2014 17:56:10 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stanislaw Gruszka <sgruszka@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Rik van Riel <riel@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v2] sched/cputime: fix clock_nanosleep/clock_gettime
 inconsistency

On Wed, Nov 12, 2014 at 04:58:44PM +0100, Stanislaw Gruszka wrote:
> Commit d670ec13178d0 "posix-cpu-timers: Cure SMP wobbles" fixes one glibc
> test case in cost of breaking another one. After that commit, calling
> clock_nanosleep(TIMER_ABSTIME, X) and then clock_gettime(&Y) can result
> of Y time being smaller than X time.
> 
> Below is full reproducer (tst-cpuclock2.c) :
> 
> /* Parameters for the Linux kernel ABI for CPU clocks.  */
>         ((~(clockid_t) (pid) << 3) | (clockid_t) (clock))
> 

You lost all the #include and #define stmts there, restored them from
the previous posting.
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