linux-kernel - Re: lockdep warning: console vs. mem hotplug

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Date:   Sat, 25 Mar 2017 11:59:07 +0100 (CET)
From:   Sebastian Ott <sebott@...ux.vnet.ibm.com>
To:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>
cc:     Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: lockdep warning: console vs. mem hotplug

On Sat, 25 Mar 2017, Sergey Senozhatsky wrote:

> On (03/21/17 13:44), Sergey Senozhatsky wrote:
> [..]
> > so we probably can
> > 
> > 
> > 1) move pr_info() out of zone->lock in __offline_isolated_pages().
> >    meh...
> > 
> > 
> > 2) switch to printk_deferred() in __offline_isolated_pages().
> >    meh.. there might a bunch of other printks done from under zone->lock.
> > 
> > 
> > 3) move add_timer() out of sclp_con_lock console in sclp_console_write().
> >    well, there can be other consoles that do something similar.
> > 
> > 
> > 4) ... something smart.
> 
> 
> Sebastian, does this change make lockdep happy?
> 
> it removes console drivers from the __offline_isolated_pages(). not the
> best solution I can think of, but the simplest one.

It does. No complaint from lockdep.