linux-kernel - Re: [PATCH] seq_file: Fix seq_putc() to be consistent with seq

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Date:	Mon, 29 Sep 2014 12:09:27 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Petr Mladek <pmladek@...e.cz>, LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] seq_file: Fix seq_putc() to be consistent with
 seq_puts()

On Mon, 29 Sep 2014 16:47:12 +0100
Al Viro <viro@...IV.linux.org.uk> wrote:

> What we need is a helper along the lines of seq_already_overflown() that
> could be used by the few places that really want that hint.  As in
> 	if (seq_already_overflown(m))
> 		return 0; // we'll be called again with bigger buffer anyway

We already have that, it's called seq_overflow(), but it's a static
function in seq_file.c. We can easily move that to seq_file.h. If you
want to rename it to seq_already_overflown() that would be fine.

> 
> And let's make seq_printf and friends return void.  Any breakage we miss
> on grep will be caught by compiler.  Enough is enough.

I'm good with this.

Note, I'm trying to make a seq_buf.c file that consolidates the code in
trace_seq.c and seq_file.c. This will extend slightly the use cases of
the seq_buf functions, but I think all the seq_*() functions from
seq_file.c can be turned into functions that return void.

I'm thinking of making m->count > m->size be what returns overflow as
true, as m->count == m->size can have all the data, that is, nothing
lost.

I'll start writing up some patches.

-- Steve
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