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

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Date:	Mon, 17 Nov 2014 20:24:32 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Joe Perches <joe@...ches.com>
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, 17 Nov 2014 17:07:58 -0800
Joe Perches <joe@...ches.com> wrote:


> > Look at the next patch.
> 
> I don't have it and you are not cc'ing me.

It's on LKML.

> I think you are getting carried away with the helpers.

That's nice.

> 
> > > 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?
> []
> > It has nothing to do with overflow. Where did you get that from?
> 
> writing to seq_buf really only cares about overflow.
> 
> seq_buf -> write to buffer -> overflowed?
> expand buffer, redo everything else when finished,
> dump buffer

Um, that may be the case for seq_file, but it is not the case for
trace_seq. seq_buf is influenced by seq_file because I have a patch to
make seq_file use it, but it's also the guts of trace_seq that has some
different requirements. And it's also not the case with the users of
seq_buf in the last patch.

-- Steve
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