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