linux-kernel - Re: [PATCH 4/5] Char: cyclades, remove volatiles

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Date:	Sat, 07 Apr 2007 09:28:37 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] Char: cyclades, remove volatiles

Andrew Morton napsal(a):
> On Wed,  4 Apr 2007 23:45:38 +0200 (CEST) Jiri Slaby <jirislaby@...il.com> wrote:
> 
>> cyclades, remove volatiles
> 
> The other changes seem uncontroversial, but this one has the potential
> to change runtime behaviour.  And cyclades.c is a driver which some people
> actually use ;)

Well, don't you know anybody with Z card, please?

But all volatiles were
- used locally (loop variables, nonptr count read once from HW), so that nothing
has a chance to change them in the memory.
- accessed by readX/writeX (pointers to mapped HW) and that should be OK

> Have these changes been runtime-tested?

Yes this time :), I have at least PCI Y cyclades card within reach to test.

thanks,
-- 
http://www.fi.muni.cz/~xslaby/            Jiri Slaby
faculty of informatics, masaryk university, brno, cz
e-mail: jirislaby gmail com, gpg pubkey fingerprint:
B674 9967 0407 CE62 ACC8  22A0 32CC 55C3 39D4 7A7E
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