linux-kernel - Re: [PATCH 2/3] rtmutex: deboost priority conditionally when rt-mutex unlock

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Message-ID: <20170413143952.ty4dw5mvyfnhaqgh@hirez.programming.kicks-ass.net>
Date:   Thu, 13 Apr 2017 16:39:52 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Alex Shi <alex.shi@...aro.org>
Cc:     mingo@...hat.com, corbet@....net,
        "open list:LOCKING PRIMITIVES" <linux-kernel@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sebastian Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 2/3] rtmutex: deboost priority conditionally when
 rt-mutex unlock

On Thu, Apr 13, 2017 at 10:02:53PM +0800, Alex Shi wrote:
>  	/*
> +	 * 'current' release this lock, so 'current' should be a higher prio
> +	 * task than the next top waiter, unless the current prio was gotten
> +	 * from this top waiter, iff so, we need to deboost 'current' after
> +	 * the lock release.
> +	 */
> +	if (current->prio == waiter->prio)
> +		deboost = true;

This is wrong.