linux-kernel - Re: Regression in next with use printk

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Message-ID: <20170214182956.GS6500@twins.programming.kicks-ass.net>
Date:   Tue, 14 Feb 2017 19:29:56 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:     Tony Lindgren <tony@...mide.com>, Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>, linux-pm@...r.kernel.org,
        John Stultz <john.stultz@...aro.org>
Subject: Re: Regression in next with use printk_safe buffers in printk

On Wed, Feb 15, 2017 at 01:56:45AM +0900, Sergey Senozhatsky wrote:
> that crossed my mind, but I kinda assumed that we do printk() from
> under tk_core using sched fair, and rt_runtime_lock is from sched rt.

That's all true; lockdep doesn't care :-) All it knows is that at some
point those locks nest.