Re: [RFC][PATCH 1/3] trace_seq: Move the trace_seq code to lib/

[Johannes Berg]

On Mon, 2014-06-23 at 12:08 -0400, Steven Rostedt wrote:
> On Sun, 22 Jun 2014 09:38:05 +0200
> Johannes Berg <johannes@xxxxxxxxxxxxxxxx> 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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