linux-kernel - Re: sysfs file creation result nightmare

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Message-Id: <20061215154751.86a2dbdd.khali@linux-fr.org>
Date:	Fri, 15 Dec 2006 15:47:51 +0100
From:	Jean Delvare <khali@...ux-fr.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Andrew Morton <akpm@...l.org>,
	Olivier Galibert <galibert@...ox.com>,
	Paul Mackerras <paulus@...ba.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: sysfs file creation result nightmare

Ben,

On Sun, 10 Dec 2006 11:55:31 +1100, Benjamin Herrenschmidt wrote:
> > And (ultimately) make the function return void.
> > 
> > Yes, that's probably a valid approach - we've discussed it before but nobody has
> > taken it further.
> 
> I would have preferred that approach (with a WARN_ON rather than a BUG
> though). On the other hand that would make it slightly harder for the
> few cases (if any ?) who actually want something like a "create if it
> doesn't exist already" semantic.

Let's just boldly state that nobody wants that semantic, if it helps.

> I'm a bit worried by the amount of code added by systematic checking of
> the results for cases that really should never happen. That's why I
> prefer a BUG/WARN type semantic.
> 
> Maybe the best is to have the examples like radeonfb actually do the
> 
> WARN_ON(sysfs_create_file(...));

Beware that sysfs_remove_bin_file() will complain loudly if you later
attempt to delete that file that was never created.

-- 
Jean Delvare
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