linux-kernel - Re: [RFC][PATCHv5 4/7] printk: always use deferred printk when flush printk

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Date:   Mon, 12 Dec 2016 16:20:44 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:     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>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [RFC][PATCHv5 4/7] printk: always use deferred printk when flush
 printk_safe lines

On Thu 2016-12-01 22:55:43, Sergey Senozhatsky wrote:
> Always use printk_deferred() in printk_safe_flush_line().
> Flushing can be done from NMI or printk_safe contexts (when
> we are in panic), so we can't call console drivers, yet still
> want to store the messages in the logbuf buffer. Therefore we
> use a deferred printk version.

Also this makes it clear that we are storing the messages into
the main logbuffer here. Note that printk() might get redirected
to the per-CPU buffer when this is triggered in panic.

> Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> Suggested-by: Petr Mladek <pmladek@...e.com>

Reviewed-by: Petr Mladek <pmladek@...e.com>

Best Regards,
Petr