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

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Message-ID: <20170216151009.GS21809@atomide.com>
Date:   Thu, 16 Feb 2017 07:10:09 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>, linux-pm@...r.kernel.org,
        Russell King <rmk@...linux.org.uk>
Subject: Re: Regression in next with use printk_safe buffers in printk

* Sergey Senozhatsky <sergey.senozhatsky.work@...il.com> [170215 20:26]:
> On (02/15/17 20:03), Tony Lindgren wrote:
> > * Sergey Senozhatsky <sergey.senozhatsky.work@...il.com> [170215 17:32]:
> > > On (02/15/17 10:01), Tony Lindgren wrote:
> > > [..]
> > > > Below is another issue I noticed caused by commit f975237b7682 that
> > > > I noticed during booting.
> > > 
> > > do you mean that with f975237b7682 you _always_ see that illegal RCU
> > > usage warning?
> > 
> > Yeah on every boot on devices using cpuidle_coupled.
> 
> does this mean that with the printk-safe patches reverted
> (so, basically, the same conditions module 4 printk patches)
> you don't see illegal RCU usage reports? at the moment I can't
> see any connection between f975237b7682 and RCU usage from idle CPU.

Yes reverting those four patches I listed earlier also makes it go
away.

Regards,

Tony