linux-kernel - Re: CONFIG_VIRT_TO_BUS: what about bus_to

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Message-Id: <20070721202637.8895b426.sfr@canb.auug.org.au>
Date:	Sat, 21 Jul 2007 20:26:37 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: CONFIG_VIRT_TO_BUS: what about bus_to_virt?

On Sat, 21 Jul 2007 11:52:18 +0200 Stefan Richter <stefanr@...6.in-berlin.de> wrote:
>
> Is it sensible and safe to let a driver which uses bus_to_virt (but not
> virt_to_bus) depend on CONFIG_VIRT_TO_BUS?

If a driver depends on either bus_to_virt or virt_to_bus, then it
depend on CONFIG_VIRT_TO_BUS.  The intention is to exclude the driver from
being built on achitectures that don't implement those primitives (and
architectures always implement them both or neither).

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/

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