linux-kernel - Re: [RFC PATCH v1 00/25] printk: new implementation

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Date:   Wed, 13 Mar 2019 19:06:53 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:     Sebastian Siewior <bigeasy@...utronix.de>,
        John Ogness <john.ogness@...utronix.de>,
        Petr Mladek <pmladek@...e.com>, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Daniel Wang <wonderfly@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Cox <gnomes@...rguk.ukuu.org.uk>,
        Jiri Slaby <jslaby@...e.com>,
        Peter Feiner <pfeiner@...gle.com>,
        linux-serial@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: [RFC PATCH v1 00/25] printk: new implementation

On (03/13/19 18:27), Sergey Senozhatsky wrote:
> > Does this mean we keep irq_work part or we bury it and solve it by other
> > means?
>
> That's a very good question. Because if we add console_trylock()
> to printk(), then we can't invoke ->atomic() consoles when console_sem
> is already locked, because one of the registered drivers is currently
> being modified by a 3rd party and printk(), thus, must stay away.
	   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
	    one of the drivers or the list itself.

	-ss