linux-kernel - Re: [PATCH v2] fbdev: make get_fb_unmapped

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Date:   Wed, 12 Jul 2017 10:17:32 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Benjamin Gaignard <benjamin.gaignard@...aro.org>
Cc:     b.zolnierkie@...sung.com, daniel.vetter@...ll.ch,
        linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        noralf@...nnes.org, dri-devel@...ts.freedesktop.org,
        emil.l.velikov@...il.com, yannick.fertre@...com,
        eric.engestrom@...tec.com
Subject: Re: [PATCH v2] fbdev: make get_fb_unmapped_area depends of !MMU

On Wed, Jul 12, 2017 at 09:43:07AM +0200, Benjamin Gaignard wrote:
> Even if CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA flag is selected
> do not compile and use get_fb_unmapped_area() if CONFIG_MMU is
> also set. This will avoid mmap errors when compiling multi
> architectures at same time.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...aro.org>

Yeah we have the same CONFIG_MMU check on the gem side for
get_unmapped_area.

Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>

> ---
> version 2:
> - remove duplicated "\"
> 
>  drivers/video/fbdev/core/fbmem.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
> index 069fe79..f20c5d2 100644
> --- a/drivers/video/fbdev/core/fbmem.c
> +++ b/drivers/video/fbdev/core/fbmem.c
> @@ -1492,7 +1492,7 @@ static long fb_compat_ioctl(struct file *file, unsigned int cmd,
>  	return 0;
>  }
>  
> -#ifdef CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA
> +#if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU)
>  unsigned long get_fb_unmapped_area(struct file *filp,
>  				   unsigned long addr, unsigned long len,
>  				   unsigned long pgoff, unsigned long flags)
> @@ -1519,7 +1519,8 @@ unsigned long get_fb_unmapped_area(struct file *filp,
>  	.open =		fb_open,
>  	.release =	fb_release,
>  #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \
> -    defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA)
> +	(defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \
> +	 !defined(CONFIG_MMU))
>  	.get_unmapped_area = get_fb_unmapped_area,
>  #endif
>  #ifdef CONFIG_FB_DEFERRED_IO
> -- 
> 1.9.1
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch