Re: [PATCH 20/26 v5] seq_buf: Add seq_buf_can_fit() helper function

From: Steven Rostedt
Date: Mon Nov 17 2014 - 20:24:48 EST

On Mon, 17 Nov 2014 17:07:58 -0800
Joe Perches <joe@xxxxxxxxxxx> 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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