linux-kernel - Re: is avoiding compat ioctls possible?

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Date:	Wed, 28 Oct 2009 01:28:16 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	andi@...stfloor.org
Cc:	airlied@...ux.ie, dri-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, arnd@...db.de
Subject: Re: is avoiding compat ioctls possible?

From: Andi Kleen <andi@...stfloor.org>
Date: Wed, 28 Oct 2009 09:19:09 +0100

> On Wed, Oct 28, 2009 at 01:11:41AM -0700, David Miller wrote:
>> From: Andi Kleen <andi@...stfloor.org>
>> Date: Wed, 28 Oct 2009 08:59:08 +0100
>> 
>> >>  	}
>> >> -	chunk_array_ptr = (uint64_t *)(unsigned long)(cs->chunks);
>> >> +#ifdef CONFIG_COMPAT
>> >> +	if (is_compat_task())
>> > 
>> > Are the COMPAT ifdefs really needed? The compiler should optimize that
>> > away anyways on non compat aware architectures, shouldn't it?
>> 
>> There are no non-compat is_compat_task() definitions, nor are there
>> non-compat build definitions of compat_uptr_t and the assosciated
>> interfaces.
> 
> That seems wrong then, better fix that too? It would be certainly better
> than adding a lot of ifdefs.

That's usually done by seperating the compat code into a seperate
file and "obj-$(CONFIG_COMPAT) += foo.o" in the Makefile.

That's not really possible here.

Sure, longer term we can provide those kinds of definitions to avoid
the ifdefs, but that's not what my change is about. :-)
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