linux-kernel - Re: [PATCH] fbdev: Make registered

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Date:   Wed, 27 Jul 2022 06:08:39 +0200
From:   Helge Deller <deller@....de>
To:     Javier Martinez Canillas <javierm@...hat.com>,
        linux-kernel@...r.kernel.org,
        Daniel Vetter <daniel.vetter@...ll.ch>
Cc:     linux-staging@...ts.linux.dev,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        dri-devel@...ts.freedesktop.org,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Alex Deucher <alexander.deucher@....com>,
        Daniel Vetter <daniel@...ll.ch>,
        Sam Ravnborg <sam@...nborg.org>, linux-fbdev@...r.kernel.org
Subject: Re: [PATCH] fbdev: Make registered_fb[] private to fbmem.c

On 7/26/22 09:22, Helge Deller wrote:
> On 7/25/22 09:54, Javier Martinez Canillas wrote:
>> From: Daniel Vetter <daniel.vetter@...ll.ch>
>>
>> No driver access this anymore, except for the olpc dcon fbdev driver but
>> that has been marked as broken anyways by commit de0952f267ff ("staging:
>> olpc_dcon: mark driver as broken").
>>
>> Signed-off-by: Daniel Vetter <daniel.vetter@...el.com>
>> Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
>> Reviewed-by: Javier Martinez Canillas <javierm@...hat.com>
>> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
>
> I've applied it to the fbdev git tree.

I've dropped that patch for now from the fbdev git tree, since
it gave build errors [1] in for-next:

 drivers/video/fbdev/simplefb.c:426:6: error: use of undeclared identifier 'num_registered_fb'; did you mean 'WB_registered'?
           if (num_registered_fb > 0) {
               ^~~~~~~~~~~~~~~~~

Helge

[1] https://lore.kernel.org/all/202207270857.mo9oRcRE-lkp@intel.com/


>>
>>  drivers/video/fbdev/core/fbmem.c | 6 +++---
>>  include/linux/fb.h               | 6 ------
>>  2 files changed, 3 insertions(+), 9 deletions(-)
>>
>> diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
>> index 6ae1c5fa19f9..1e70d8c67653 100644
>> --- a/drivers/video/fbdev/core/fbmem.c
>> +++ b/drivers/video/fbdev/core/fbmem.c
>> @@ -51,10 +51,10 @@
>>  static DEFINE_MUTEX(registration_lock);
>>
>>  struct fb_info *registered_fb[FB_MAX] __read_mostly;
>> -EXPORT_SYMBOL(registered_fb);
>> -
>>  int num_registered_fb __read_mostly;
>> -EXPORT_SYMBOL(num_registered_fb);
>> +#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 453c3b2b6b8e..0aff76bcbb00 100644
>> --- a/include/linux/fb.h
>> +++ b/include/linux/fb.h
>> @@ -627,16 +627,10 @@ 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);
>>
>> -extern struct fb_info *registered_fb[FB_MAX];
>> -extern int num_registered_fb;
>>  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);
>