linux-kernel - Re: lib/klist.c: bit 0 in pointer can't be used as flag

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Message-ID: <2f11576a0901131440w7fd3290uc9664aaf7aa89b08@mail.gmail.com>
Date:	Wed, 14 Jan 2009 07:40:19 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Jesper Nilsson <Jesper.Nilsson@...s.com>
Cc:	David Miller <davem@...emloft.net>,
	"tj@...nel.org" <tj@...nel.org>, "gregkh@...e.de" <gregkh@...e.de>,
	"stern@...land.harvard.edu" <stern@...land.harvard.edu>,
	"jens.axboe@...cle.com" <jens.axboe@...cle.com>,
	"hinko.kocevar@...rtapot.si" <hinko.kocevar@...rtapot.si>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: lib/klist.c: bit 0 in pointer can't be used as flag

> It may be that we've worked around the other spots, although I haven't
> seen anything like that, we might just have been lucky until now.
>
> Can you recall another place where this trick is used?

rmap.
Don't CRIS use mmu?

>
> It seems that rt_mutex uses the same trick (with the lowest 2bits)
> but AFAICT that's something we don't use on CRIS.
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