linux-kernel - Re: [LKP] [PATCH] drm/radeon: Try to init amdkfd only if 64 bit kernel

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Message-ID: <20141222190041.GC17192@tassilo.jf.intel.com>
Date:	Mon, 22 Dec 2014 11:00:41 -0800
From:	Andi Kleen <ak@...ux.intel.com>
To:	Alex Deucher <alexdeucher@...il.com>
Cc:	rusty@...tcorp.com.au, Dana Elifaz <Dana.Elifaz@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Maling list - DRI developers 
	<dri-devel@...ts.freedesktop.org>,
	Oded Gabbay <oded.gabbay@....com>,
	Alexander Deucher <Alexander.Deucher@....com>,
	LKP ML <lkp@...org>
Subject: Re: [LKP] [PATCH] drm/radeon: Try to init amdkfd only if 64 bit
 kernel

On Mon, Dec 22, 2014 at 10:49:40AM -0800, Andi Kleen wrote:
> On Mon, Dec 22, 2014 at 11:58:43AM -0500, Alex Deucher wrote:
> > On Mon, Dec 22, 2014 at 6:11 AM, Oded Gabbay <oded.gabbay@....com> wrote:
> > > amdkfd driver can be compiled only in 64-bit kernel. Therefore, there is no
> > > point in trying to initialize amdkfd in 32-bit kernel.
> > >
> > > In addition, in case of specific configuration of 32-bit kernel, no modules and
> > > random kernel base, the symbol_request function doesn't work as expected - It
> > > doesn't return NULL if the symbol doesn't exists. That makes the kernel panic.
> > > Therefore, the as amdkfd doesn't compile in 32-bit kernel, the best way is just
> > > to return false immediately.
> > >
> > > Signed-off-by: Oded Gabbay <oded.gabbay@....com>
> > 
> > Reviewed-by: Alex Deucher <alexander.deucher@....com>
> 
> Sorry but the patch is just bogus. X-bit only code is usually
> a very bad sign for the code. This is not windows programing after all.
> 
> Even if you wanted to do a 64bit only driver -- which
> you probably don't -- the standard way would be to exclude
> it in Kconfig.
> 
> Please root-cause why symbol_request doesn't work on 32bit
> and fix it properly.
> 
> +rusty.

And also with correct email.

-Andi
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