linux-kernel - Re: atomics: document that linux expects certain atomic behaviour from unsigned long

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Message-ID: <20090103203044.0166b561@lxorguk.ukuu.org.uk>
Date:	Sat, 3 Jan 2009 20:30:44 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Pavel Machek <pavel@...e.cz>
Cc:	kernel list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, mtk.manpages@...il.com,
	rdunlap@...otime.net, linux-doc@...r.kernel.org
Subject: Re: atomics: document that linux expects certain atomic behaviour
 from unsigned long

> If it is okay and linux relies on it, it should be documented.
> 
> If it is not okay, I guess we should document it, too -- it seems to
> be common mistake. 

A lot of old code did it knowing it was under the BKL, outside of the BKL
its a very bad idea. There were lots of them in the tty layer and I don't
doubt there are some left I missed too 8(
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