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Date: Wed, 12 Nov 2014 17:56:10 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: linux-kernel@vger.kernel.org, Rik van Riel <riel@redhat.com>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        Oleg Nesterov <oleg@redhat.com>, Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@kernel.org>
Subject: Re: [PATCH v2] sched/cputime: fix clock_nanosleep/clock_gettime
 inconsistency
Message-ID: <20141112165610.GO29390@twins.programming.kicks-ass.net>
References: <1415788168-3165-1-git-send-email-sgruszka@redhat.com>
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 <20141112122155.GA3250@redhat.com>
 <20141112125158.GB21343@twins.programming.kicks-ass.net>
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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.