linux-kernel - Re: [PATCH 20/26 v5] seq_buf: Add seq_buf_can

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Date:	Mon, 17 Nov 2014 16:35:32 -0800
From:	Joe Perches <joe@...ches.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Kosina <jkosina@...e.cz>, Petr Mladek <pmladek@...e.cz>
Subject: Re: [PATCH 20/26 v5] seq_buf: Add seq_buf_can_fit() helper function

On Mon, 2014-11-17 at 19:27 -0500, Steven Rostedt wrote:
> On Mon, 17 Nov 2014 16:07:33 -0800
> Joe Perches <joe@...ches.com> wrote:
> 
> > On Mon, 2014-11-17 at 12:36 -0500, Steven Rostedt wrote:
> > > On Fri, 14 Nov 2014 23:59:07 -0500
> > > Steven Rostedt <rostedt@...dmis.org> wrote:
> > > 
> > > > From: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>
> > > > 
> > > > Add a seq_buf_can_fit() helper function that removes the possible mistakes
> > > > of comparing the seq_buf length plus added data compared to the size of
> > > > the buffer.
> > []
> > > > +static bool seq_buf_can_fit(struct seq_buf *s, size_t len)
> > > > +{
> > > > +	return s->len + len < s->size;
> > > > +}
> > > > +
> > 
> > Why is this useful?
> 
> Places the logic in one place and makes the next patch much shorter.

What "logic" does it place in one place and
how does it matter?

I don't see it making mistakes more or less
likely, I just see it being used to avoid
setting the overflow state which seems like
more of an error than anything else.

Why avoid setting overflow at all?


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