linux-kernel - Re: printk: what is going on with additional newlines?

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Date:   Wed, 30 Aug 2017 11:25:28 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Joe Perches <joe@...ches.com>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Pavel Machek <pavel@....cz>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Petr Mladek <pmladek@...e.com>, Jan Kara <jack@...e.cz>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jiri Slaby <jslaby@...e.com>, Andreas Mohr <andi@...as.de>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: printk: what is going on with additional newlines?

On (08/29/17 18:52), Joe Perches wrote:
[..]
> > We could simply add a seq_buf_printk() that is implemented in the printk
> > proper, to parse the seq_buf buffer properly, and add the timestamps and
> > such.
> 
> No need.  printk would already add timestamps.

the idea is not to do printk() on that seq buffer at all, but to
log_store(), atomically, seq buffer messages

	spin_lock(&logbuf_lock)
	while (offset < seq_buffer->len) {
		...
		log_store(seq->buffer + offset);
		...
	}
	spin_unlock(&logbuf_unlock)

	-ss