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

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Date:	Wed, 15 Aug 2012 23:31:26 +0200
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	Huacai Chen <chenhuacai@...il.com>
Cc:	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
	Fuxin Zhang <zhangfx@...ote.com>,
	Zhangjin Wu <wuzhangjin@...il.com>,
	Huacai Chen <chenhc@...ote.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 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.

  Ralf
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