linux-kernel - Re: [PATCH] powerpc: define empty enable_kernel_vsx() when CONFIG

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Date:	Tue, 8 Sep 2015 17:19:51 -0600
From:	Tim Gardner <tim.gardner@...onical.com>
To:	Paul Mackerras <paulus@...abs.org>
Cc:	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Leonidas Da Silva Barbosa <leosilva@...ux.vnet.ibm.com>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: [PATCH] powerpc: define empty enable_kernel_vsx() when
 CONFIG_VSX=n

On 09/08/2015 04:47 PM, Paul Mackerras wrote:
> On Tue, Sep 08, 2015 at 12:13:11PM -0600, tim.gardner@...onical.com wrote:
>> From: Tim Gardner <tim.gardner@...onical.com>
>>
>> commit 72cd7b44bc99 ("powerpc: Uncomment and make enable_kernel_vsx()
>> routine available") neglected to define an empty inline replacement for
>> enable_kernel_vsx() when CONFIG_VSX=n.
> 
> If code that wants to call enable_kernel_vsx() is getting compiled in
> when CONFIG_VSX=n, that's a worry.  Is this patch motivated by an
> actual compile failure?  If so what was the failure?
> 
> Paul.
> 

I was having link failures after backporting 'crypto: nx' patches to a
4.2 based kernel. You may have a point in that the upstream Kconfig will
not allow those files to be compiled if CONFIG_VSX=n. I will check in my
morning if to see if I can reproduce the same link error in mainline.

rtg
-- 
Tim Gardner tim.gardner@...onical.com
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