linux-kernel - Re: [PATCH 1/7] printk: Hand over printing to console if printing too long

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Date:	Tue, 5 Jan 2016 15:37:17 +0100
From:	Jan Kara <jack@...e.cz>
To:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:	Jan Kara <jack@...e.cz>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Petr Mladek <pmladek@...e.cz>,
	KY Sri nivasan <kys@...rosoft.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] printk: Hand over printing to console if printing
 too long

Hi,

On Wed 23-12-15 10:54:49, Sergey Senozhatsky wrote:
> slowly looking through the patches.

Back from Christmas vacation...

> How about setting 'sync_print' to 'true' in...
>   bust_spinlocks() /* only set to true */
> or
>   console_verbose() /* um... may be... */
> or
>   having a separate one-liner for that
> 
> void console_panic_mode(void)
> {
> 	sync_print = true;
> }
> 
> and call it early in panic(), before we send out IPI_STOP.

I like using console_verbose() for setting sync_print to true. That will
likely be more reliable than using oops in progress. After all
console_verbose() is used like console_panic_mode() anyway and in quite a
few places so it is a reasonable match.

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR
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