linux-kernel - Re: [patch 03/44] posix-timer: Use a callback for cancel synchronization

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Message-ID: <20190820022109.GB9594@infradead.org>
Date:   Mon, 19 Aug 2019 19:21:09 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        John Stultz <john.stultz@...aro.org>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Anna-Maria Behnsen <anna-maria@...utronix.de>
Subject: Re: [patch 03/44] posix-timer: Use a callback for cancel
 synchronization

> +	if (!WARN_ON_ONCE(kc->timer_wait_running))
> +		kc->timer_wait_running(timer);

This looks weird. The only place calling yor new method only does so
after checking that it is not set and actually warns if it set?