linux-kernel - Re: [tip:x86/headers] x86: truncate ISA addresses to unsigned int

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Message-ID: <499B2B5F.2070407@linux.intel.com>
Date:	Tue, 17 Feb 2009 13:25:51 -0800
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
CC:	hpa@...or.com, mingo@...hat.com, tglx@...utronix.de,
	linux-kernel@...r.kernel.org, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/headers] x86: truncate ISA addresses to unsigned int

James Bottomley wrote:
>> +static inline unsigned int isa_virt_to_bus(volatile void *address)
> 
> The rest looks fine, but why is the address volatile?  The macro below
> never actually dereferences it.
> 

Because a volatile is permitted.  virt_to_phys() takes a volatile 
pointer for that reason.

	-hpa
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