linux-kernel - Re: [PATCHv7 6/8] printk: use printk

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Date:   Thu, 2 Feb 2017 11:11:34 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Peter Zijlstra <peterz@...radead.org>, Jan Kara <jack@...e.cz>,
        Ross Zwisler <zwisler@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tejun Heo <tj@...nel.org>, Calvin Owens <calvinowens@...com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Hurley <peter@...leysoftware.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [PATCHv7 6/8] printk: use printk_safe buffers in printk

On (02/01/17 16:39), Petr Mladek wrote:
[..]
> I guess that you are talking about the introduction of
> #define SCHED_WARN_ON(x)	WARN_ONCE(x, #x)

my guess would be that Jan was talking about printk_deferred() patch.
it's on my TODO list.

I want to entirely remove console_sem and scheduler out of printk() path.
that's the only way to make printk() deadlock safe.

	-ss