linux-kernel - Re: [PATCH] timer: silenct a lockdep splat with debugobjects

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Message-ID: <20200313212620.GA2452@worktop.programming.kicks-ass.net>
Date:   Fri, 13 Mar 2020 22:26:20 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Qian Cai <cai@....pw>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        John Stultz <john.stultz@...aro.org>, sboyd@...nel.org,
        rostedt@...dmis.org, hannes@...xchg.org,
        linux-kernel@...r.kernel.org, Andy Lutomirski <luto@...capital.net>
Subject: Re: [PATCH] timer: silenct a lockdep splat with debugobjects

On Fri, Mar 13, 2020 at 05:00:41PM -0400, Qian Cai wrote:
> > On Mar 13, 2020, at 4:13 PM, Peter Zijlstra <peterz@...radead.org> wrote:

> > 
> > Or, fix that random crud to do the wakeup outside of the lock.
> 
> That is likely to be difficult until we can find a creative way to not “uglifying" the
> random code by dropping locks in the middle etc just because of debugojects.

https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git/log/?h=random/fast

Doesn't look difficult at all.