linux-kernel - Re: [PATCH v2 03/13] ANDROID: binder: add support for RT prio inheritance.

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Message-ID: <20170831122150.7y2rfvgkppoig5sd@hirez.programming.kicks-ass.net>
Date:   Thu, 31 Aug 2017 14:21:50 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Martijn Coenen <maco@...roid.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        John Stultz <john.stultz@...aro.org>,
        Todd Kjos <tkjos@...gle.com>,
        Arve Hjønnevåg <arve@...roid.com>,
        Amit Pundir <amit.pundir@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Christoph Hellwig <hch@....de>,
        LKML <linux-kernel@...r.kernel.org>, devel@...verdev.osuosl.org,
        Martijn Coenen <maco@...gle.com>,
        Iliyan Malchev <malchev@...gle.com>,
        Colin Cross <ccross@...roid.com>
Subject: Re: [PATCH v2 03/13] ANDROID: binder: add support for RT prio
 inheritance.

On Thu, Aug 31, 2017 at 02:00:54PM +0200, Martijn Coenen wrote:
> Appreciate if you could take a look! In particular I'm curious why
> this approach is considered "dodgy", or "engineered sideways" as
> Thomas pointed out earlier. 

The fact that you could not reuse rt_mutex makes me very nervous. Other
than that I cannot say anything because I've not actually looked at any
of the code yet.