linux-kernel - Re: [PATCH v5 4/4] printk: use the lockless ringbuffer

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Message-ID: <20200720083420.GB463@jagdpanzerIV.localdomain>
Date:   Mon, 20 Jul 2020 17:34:20 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Marco Elver <elver@...gle.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        John Ogness <john.ogness@...utronix.de>,
        Petr Mladek <pmladek@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrea Parri <parri.andrea@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Paul McKenney <paulmck@...nel.org>, kexec@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 4/4] printk: use the lockless ringbuffer

On (20/07/20 08:43), Marco Elver wrote:
[..]
> please see a full list of newline-print users below.
[..]
> $> git grep -En '\<(printk|pr_err|pr_warn|pr_info)\>\("\\n"\)'
> arch/alpha/kernel/core_wildfire.c:650:	printk("\n");
> arch/alpha/kernel/core_wildfire.c:658:	printk("\n");
> arch/alpha/kernel/traps.c:120:	printk("\n");
[..]

In many cases printk("\n") is not for "print a blank line", but
rather for "flush pr_cont buffer".

	-ss