linux-kernel - Re: [PATCH V5 13/18] drm: Define SAREA_MAX for Loongson (PageSize = 16KB).

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Message-ID: <CAAhV-H46joC7baQ44-O0sqWM4iWVFf=DE2DoAVn1+bxro+7pNg@mail.gmail.com>
Date:	Thu, 16 Aug 2012 08:43:06 +0800
From:	Huacai Chen <chenhuacai@...il.com>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
	Fuxin Zhang <zhangfx@...ote.com>,
	Zhangjin Wu <wuzhangjin@...il.com>,
	Hongliang Tao <taohl@...ote.com>, Hua Yan <yanh@...ote.com>,
	dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH V5 13/18] drm: Define SAREA_MAX for Loongson (PageSize = 16KB).

On Thu, Aug 16, 2012 at 5:31 AM, Ralf Baechle <ralf@...ux-mips.org> wrote:
> On Sat, Aug 11, 2012 at 05:32:18PM +0800, Huacai Chen wrote:
>
>> Subject: [PATCH V5 13/18] drm: Define SAREA_MAX for Loongson (PageSize = 16KB).
>
> But your code doesn't define it just for Loongsson as the log message claims
> but rather for all MIPS.
>
>> diff --git a/include/drm/drm_sarea.h b/include/drm/drm_sarea.h
>> index ee5389d..1d1a858 100644
>> --- a/include/drm/drm_sarea.h
>> +++ b/include/drm/drm_sarea.h
>> @@ -37,6 +37,8 @@
>>  /* SAREA area needs to be at least a page */
>>  #if defined(__alpha__)
>>  #define SAREA_MAX                       0x2000U
>> +#elif defined(__mips__)
>> +#define SAREA_MAX                       0x4000U
>
> How about replacing this whole #ifdef mess with something like:
>
> #include <linux/kernel.h>
> #include <asm/page.h>
>
> /* Intel 830M driver needs at least 8k SAREA */
> #define SAREA_MAX       max(PAGE_SIZE, 0x2000U)
>
> MIPS also uses 64K page size and your patch as posted would break with 64k
> pages.
Yes, I think this is better. Thank you.
>
>   Ralf
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