Re: [PATCH v5 7/7] fbdev: Make registered_fb[] private to fbmem.c

[Sam Ravnborg]

Hi Javier.

On Wed, May 11, 2022 at 01:32:30PM +0200, Javier Martinez Canillas wrote:
> From: Daniel Vetter <daniel.vetter@xxxxxxxx>
> 
> Well except when the olpc dcon fbdev driver is enabled, that thing
> digs around in there in rather unfixable ways.
> 
> Cc oldc_dcon maintainers as fyi.

Another way to fix this is to mark FB_OLPC_DCON and add a TODO entry to
fix this. We are really not supposed to carry such special code around
to keep staging working.

I know this may not be a popular viewpoint, but just look at the ugly
workarounds required here.

	Sam


> 
> v2: I typoed the config name (0day)
> 
> Cc: kernel test robot <lkp@xxxxxxxxx>
> Cc: Jens Frederich <jfrederich@xxxxxxxxx>
> Cc: Jon Nettleton <jon.nettleton@xxxxxxxxx>
> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Cc: linux-staging@xxxxxxxxxxxxxxx
> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Reviewed-by: Javier Martinez Canillas <javierm@xxxxxxxxxx>
> Cc: Daniel Vetter <daniel@xxxxxxxx>
> Cc: Helge Deller <deller@xxxxxx>
> Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
> Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
> Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
> Cc: Zhen Lei <thunder.leizhen@xxxxxxxxxx>
> Cc: Alex Deucher <alexander.deucher@xxxxxxx>
> Cc: Xiyu Yang <xiyuyang19@xxxxxxxxxxxx>
> Cc: linux-fbdev@xxxxxxxxxxxxxxx
> Cc: Zheyu Ma <zheyuma97@xxxxxxxxx>
> Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
> Signed-off-by: Javier Martinez Canillas <javierm@xxxxxxxxxx>
> ---
> 
> (no changes since v1)
> 
>  drivers/video/fbdev/core/fbmem.c | 8 ++++++--
>  include/linux/fb.h               | 7 +++----
>  2 files changed, 9 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
> index 265efa189bcc..6cab5f4c1fb3 100644
> --- a/drivers/video/fbdev/core/fbmem.c
> +++ b/drivers/video/fbdev/core/fbmem.c
> @@ -50,10 +50,14 @@
>  static DEFINE_MUTEX(registration_lock);
>  
>  struct fb_info *registered_fb[FB_MAX] __read_mostly;
> -EXPORT_SYMBOL(registered_fb);
> -
>  int num_registered_fb __read_mostly;
> +#if IS_ENABLED(CONFIG_FB_OLPC_DCON)
> +EXPORT_SYMBOL(registered_fb);
>  EXPORT_SYMBOL(num_registered_fb);
> +#endif

It is stuff like this I refer to as "ugly" in the comment above.

	Sam