linux-kernel - Re: [RFC][PATCHv3 0/6] printk: use printk_safe to handle printk() recursive calls

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Message-ID: <20161019011434.GB513@swordfish>
Date:   Wed, 19 Oct 2016 10:14:34 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Joe Perches <joe@...ches.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Petr Mladek <pmladek@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jan Kara <jack@...e.cz>, Tejun Heo <tj@...nel.org>,
        Calvin Owens <calvinowens@...com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [RFC][PATCHv3 0/6] printk: use printk_safe to handle printk()
 recursive calls

On (10/18/16 09:45), Joe Perches wrote:
> On Wed, 2016-10-19 at 00:40 +0900, Sergey Senozhatsky wrote:
> > This patch set extends a lock-less NMI per-cpu buffers idea to
> > handle recursive printk() calls.
> 
> trivia:
> 
> recursive or reentrant?

a recursive one.

printk -> {foo} -> printk



reentrant printk() case was addressed by Petr Mladek's nmi patchset:

printk()
	foo
	-------> NMI
		printk()

	-ss