Re: [PATCH 21/21] fbdev: Make registered_fb[] private to fbmem.c

[Sam Ravnborg]

Hi Daniel,

On Mon, Jan 31, 2022 at 10:05:52PM +0100, Daniel Vetter wrote:
> 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.
> 
> 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>
> 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>

with the build thingy fixed:
Acked-by: Sam Ravnborg <sam@xxxxxxxxxxxx>

I do wonder if there is a more clean way to trigger a blank
in the main fbdev driver from the olpc driver.

The current hack is not nice and it would be good to see it gone.

	Sam

> ---
>  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 904ef1250677..dad6572942fa 100644
> --- a/drivers/video/fbdev/core/fbmem.c
> +++ b/drivers/video/fbdev/core/fbmem.c
> @@ -48,10 +48,14 @@
>  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_OLPC_DCON)
> +EXPORT_SYMBOL(registered_fb);
>  EXPORT_SYMBOL(num_registered_fb);
> +#endif
> +#define for_each_registered_fb(i)		\
> +	for (i = 0; i < FB_MAX; i++)		\
> +		if (!registered_fb[i]) {} else
>  
>  bool fb_center_logo __read_mostly;
>  
> diff --git a/include/linux/fb.h b/include/linux/fb.h
> index a8a00d2ba1f3..e236817502c2 100644
> --- a/include/linux/fb.h
> +++ b/include/linux/fb.h
> @@ -622,16 +622,15 @@ extern int fb_get_color_depth(struct fb_var_screeninfo *var,
>  extern int fb_get_options(const char *name, char **option);
>  extern int fb_new_modelist(struct fb_info *info);
>  
> +#if IS_ENABLED(CONFIG_OLPC_DCON)
>  extern struct fb_info *registered_fb[FB_MAX];
> +
>  extern int num_registered_fb;
> +#endif
>  extern bool fb_center_logo;
>  extern int fb_logo_count;
>  extern struct class *fb_class;
>  
> -#define for_each_registered_fb(i)		\
> -	for (i = 0; i < FB_MAX; i++)		\
> -		if (!registered_fb[i]) {} else
> -
>  static inline void lock_fb_info(struct fb_info *info)
>  {
>  	mutex_lock(&info->lock);
> -- 
> 2.33.0