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Re: [PATCH] I/O helpers rework

To: "Maciej W. Rozycki" <macro@mips.com>
Subject: Re: [PATCH] I/O helpers rework
From: Richard Sandiford <rsandifo@redhat.com>
Date: Thu, 13 Jan 2005 21:48:36 +0000
Cc: Atsushi Nemoto <anemo@mba.ocn.ne.jp>, ralf@linux-mips.org, linux-mips@linux-mips.org, macro@linux-mips.org
In-reply-to: <Pine.LNX.4.61.0501131824350.21179@perivale.mips.com> (Maciej W. Rozycki's message of "Thu, 13 Jan 2005 18:25:57 +0000 (GMT)")
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <Pine.LNX.4.61.0412151936460.14855@perivale.mips.com> <20050107.004521.74752947.anemo@mba.ocn.ne.jp> <Pine.LNX.4.61.0501101503020.18023@perivale.mips.com> <20050111.022138.25909508.anemo@mba.ocn.ne.jp> <Pine.LNX.4.61.0501101750420.18023@perivale.mips.com> <874qhltcyv.fsf@redhat.com> <Pine.LNX.4.61.0501131824350.21179@perivale.mips.com>
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"Maciej W. Rozycki" <macro@mips.com> writes:
> On Thu, 13 Jan 2005, Richard Sandiford wrote:
>
>> >> Well, maybe the 'volatile' have no sense, but some archs (including
>> >> i386, of course :-)) and some drivers use it.  Adding the 'volatile'
>> >> will remove some compiler warnings.
>> >
>> >  As will removing "volatile" from broken ports.
>> 
>> There's nothing wrong with "volatile void *".
>
>  So what's the volatile value you can get by dereferencing such a pointer?

You can't dereference it, obviously, just like you can't deference a
normal "void *".  But you can assign it to any "volatile T *" without
an explicit cast.  I assumed that's what was happening in this case?

Richard

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