linux-kernel - Re: [PATCH] ttm: Fix a potential comparison of structs.

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Date:	Sun, 02 Aug 2009 20:12:18 +0200
From:	Thomas Hellström <thellstrom@...are.com>
To:	Pekka Paalanen <pq@....fi>
CC:	"dri-devel@...ts.sourceforge.net" <dri-devel@...ts.sourceforge.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dave Airlie <airlied@...il.com>
Subject: Re: [PATCH] ttm: Fix a potential comparison of structs.

Pekka Paalanen skrev:
> From 5e2851952729b287a82efa002b28a2095404d44d Mon Sep 17 00:00:00 2001
> From: Thomas Hellstrom <thellstrom@...are.com>
> Date: Fri, 31 Jul 2009 10:47:51 +0200
> Subject: [PATCH] ttm: Fix a potential comparison of structs.
>
> On some architectures the comparison may cause a compilation failure.
>
> Original partial fix Signed-off-by: Thomas Hellstrom <thellstrom@...are.com>
>
> Signed-off-by: Pekka Paalanen <pq@....fi>
> ---
>
> Thomas, you forgot two more of these :-)
> Here's a patch that actually compiles on x86_64.
>   

Pekka,
Thanks for fixing this! (Just for clarity, i assume you mean that the 
non-x86 part now compiles on x86?)

Dave, is there a chance to have this in 2.6.31? Compilation errors are 
bad, although probably nobody has been hitting this yet..

/Thomas

>  drivers/gpu/drm/ttm/ttm_bo_util.c |    8 ++++----
>  1 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
> index f4e2eba..999fbe7 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo_util.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
> @@ -151,7 +151,7 @@ static int ttm_copy_io_ttm_page(struct ttm_tt *ttm, void *src,
>  #ifdef CONFIG_X86
>  	dst = kmap_atomic_prot(d, KM_USER0, prot);
>  #else
> -	if (prot != PAGE_KERNEL)
> +	if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
>  		dst = vmap(&d, 1, 0, prot);
>  	else
>  		dst = kmap(d);
> @@ -164,7 +164,7 @@ static int ttm_copy_io_ttm_page(struct ttm_tt *ttm, void *src,
>  #ifdef CONFIG_X86
>  	kunmap_atomic(dst, KM_USER0);
>  #else
> -	if (prot != PAGE_KERNEL)
> +	if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
>  		vunmap(dst);
>  	else
>  		kunmap(d);
> @@ -187,7 +187,7 @@ static int ttm_copy_ttm_io_page(struct ttm_tt *ttm, void *dst,
>  #ifdef CONFIG_X86
>  	src = kmap_atomic_prot(s, KM_USER0, prot);
>  #else
> -	if (prot != PAGE_KERNEL)
> +	if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
>  		src = vmap(&s, 1, 0, prot);
>  	else
>  		src = kmap(s);
> @@ -200,7 +200,7 @@ static int ttm_copy_ttm_io_page(struct ttm_tt *ttm, void *dst,
>  #ifdef CONFIG_X86
>  	kunmap_atomic(src, KM_USER0);
>  #else
> -	if (prot != PAGE_KERNEL)
> +	if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
>  		vunmap(src);
>  	else
>  		kunmap(s);
>   

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