linux-kernel - Re: [RFC][PATCH 1/3] trace_seq: Move the trace

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Date:	Mon, 23 Jun 2014 19:38:14 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>, Jiri Kosina <jkosina@...e.cz>,
	Michal Hocko <mhocko@...e.cz>, Jan Kara <jack@...e.cz>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Dave Anderson <anderson@...hat.com>,
	Petr Mladek <pmladek@...e.cz>
Subject: Re: [RFC][PATCH 1/3] trace_seq: Move the trace_seq code to lib/

On Mon, 2014-06-23 at 12:08 -0400, Steven Rostedt wrote:
> On Sun, 22 Jun 2014 09:38:05 +0200
> Johannes Berg <johannes@...solutions.net> wrote:
> 
> 
> > Looking at the code though, I'm not sure it's a pure optimisation - if
> > you do say putc() after a failed puts(), without this code the putc()
> > would succeed? I can't tell right now if that's really a problem, but it
> > seems you could get some odd behaviour out of it.
> 
> How would putc() still succeed? We're just talking about the "full"
> field. It would still do the length check:
> 
> 	if (s->len >= (PAGE_SIZE - 1))
> 		return 0;

Right, but the puts() could fail if not all of the string fits, and a
subsequent putc() might fit.

johannes

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