linux-kernel - Re: [PATCH] drm: Kconfig: Let all DRM_GEM_CMA_HELPER related macros depend on HAVE_DMA

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Message-ID: <54ED2AB9.5070908@sunrus.com.cn>
Date:	Wed, 25 Feb 2015 09:51:53 +0800
From:	Chen Gang S <gang.chen@...rus.com.cn>
To:	airlied@...ux.ie, p.zabel@...gutronix.de,
	laurent.pinchart@...asonboard.com
CC:	robdclark@...il.com, boris.brezillon@...e-electrons.com,
	nicolas.ferre@...el.com, benjamin.gaignard@...aro.org,
	jg1.han@...sung.com, dri-devel@...ts.freedesktop.org,
	linux-sh@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	chris@...kel.net, jcmvbkbc@...il.com
Subject: Re: [PATCH] drm: Kconfig: Let all DRM_GEM_CMA_HELPER related macros
 depend on HAVE_DMA_ATTRS

> On 2/3/15 05:26, Chen Gang S wrote:
> 
> [...]
>  
>>
>>  - Xtensa gcc5 cross compiler has issues:
>>
>>    it causes more than 10 broken areas with allmodconfig (but no issues
>>    with defconfig). I guess, in fact, it is only 1 real issue (which can
>>    cause all breaks), and I shall try to fix it within this month.
>>
> 
> I finish analysing for it, it is really only one issue for gcc5, and I
> guess, this issue is also not only for xtensa. I send related fix patch
> to gcc patch mailing list, hope it can pass checking.
> 
> The cause is "the variables are not initialized before using them", the
> bug information is "https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65117".
> 
> After fix this issue, it can build xtensa Linux kernel with allmodconfig
> successfully.
> 

Oh, sorry, my fix is incorrect, but gcc related members will fix it. I
guess, it will be fixed soon.

But because of this issue, I can send another patch for gcc (it can not
fix this issue, but it is related with this issue) :-).


Thanks.
-- 
Chen Gang

Open, share, and attitude like air, water, and life which God blessed
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