Re: [PATCH v2 6/6] video/logo: move logo selection logic to Kconfig

[Vincent Mailhol <mailhol@kernel.org>]

On 06/01/2026 at 12:48, Geert Uytterhoeven wrote:
> Hi Vincent,
> 
> CC linux-m68k
> 
> Thanks for your patch, which is now commit bd710b3da7308cb1
> ("video/logo: move logo selection logic to Kconfig") in fbdev/for-next.
> 
> On Thu, 1 Jan 2026 at 16:26, Vincent Mailhol <mailhol@kernel.org> wrote:
>> Now that the path to the logo file can be directly entered in Kbuild,
>> there is no more need to handle all the logo file selection in the
>> Makefile and the C files.
> 
> This may do the wrong thing when booting a multi-platform kernel.
> 
>>
>> The only exception is the logo_spe_clut224 which is only used by the
>> Cell processor (found for example in the Playstation 3) [1]. This
>> extra logo uses its own different image which shows up on a separate
>> line just below the normal logo. Because the extra logo uses a
>> different image, it can not be factorized under the custom logo logic.
>>
>> Move all the logo file selection logic to Kbuild (except from the
>> logo_spe_clut224.ppm), this done, clean-up the C code to only leave
>> one entry for each logo type (monochrome, 16-colors and 224-colors).
>>
>> [1] Cell SPE logos
>> Link: https://lore.kernel.org/all/20070710122702.765654000@pademelon.sonytel.be/
>>
>> Signed-off-by: Vincent Mailhol <mailhol@kernel.org>
> 
>> --- a/drivers/video/logo/Kconfig
>> +++ b/drivers/video/logo/Kconfig
> 
>> @@ -61,6 +63,12 @@ config LOGO_LINUX_CLUT224
>>  config LOGO_LINUX_CLUT224_FILE
>>         string "224-color logo .ppm file"
>>         depends on LOGO_LINUX_CLUT224
>> +       default "drivers/video/logo/logo_dec_clut224.ppm" if MACH_DECSTATION || ALPHA
>> +       default "drivers/video/logo/logo_mac_clut224.ppm" if MAC
> 
> E.g. an m68k multi-platform kernel including Mac support will scare
> non-Mac users into thinking their machine was assimilated by the
> Apple Empire...
> 
>> +       default "drivers/video/logo/logo_parisc_clut224.ppm" if PARISC
>> +       default "drivers/video/logo/logo_sgi_clut224.ppm" if SGI_IP22 || SGI_IP27 || SGI_IP32
>> +       default "drivers/video/logo/logo_sun_clut224.ppm" if SPARC
>> +       default "drivers/video/logo/logo_superh_clut224.ppm" if SUPERH
>>         default "drivers/video/logo/logo_linux_clut224.ppm"
>>         help
>>           Takes a path to a 224-color logo in the portable pixmap file
> 
>> --- a/drivers/video/logo/logo.c
>> +++ b/drivers/video/logo/logo.c
>> @@ -48,59 +48,21 @@ const struct linux_logo * __ref fb_find_logo(int depth)
>>         if (nologo || logos_freed)
>>                 return NULL;
>>
>> -       if (depth >= 1) {
>>  #ifdef CONFIG_LOGO_LINUX_MONO
>> -               /* Generic Linux logo */
>> +       if (depth >= 1)
>>                 logo = &logo_linux_mono;
>>  #endif
>> -#ifdef CONFIG_LOGO_SUPERH_MONO
>> -               /* SuperH Linux logo */
>> -               logo = &logo_superh_mono;
>> -#endif
>> -       }
>>
>> -       if (depth >= 4) {
>>  #ifdef CONFIG_LOGO_LINUX_VGA16
>> -               /* Generic Linux logo */
>> +       if (depth >= 4)
>>                 logo = &logo_linux_vga16;
>>  #endif
>> -#ifdef CONFIG_LOGO_SUPERH_VGA16
>> -               /* SuperH Linux logo */
>> -               logo = &logo_superh_vga16;
>> -#endif
>> -       }
>>
>> -       if (depth >= 8) {
>>  #ifdef CONFIG_LOGO_LINUX_CLUT224
>> -               /* Generic Linux logo */
>> +       if (depth >= 8)
>>                 logo = &logo_linux_clut224;
>>  #endif
>> -#ifdef CONFIG_LOGO_DEC_CLUT224
>> -               /* DEC Linux logo on MIPS/MIPS64 or ALPHA */
>> -               logo = &logo_dec_clut224;
>> -#endif
>> -#ifdef CONFIG_LOGO_MAC_CLUT224
>> -               /* Macintosh Linux logo on m68k */
>> -               if (MACH_IS_MAC)
> 
> MACH_IS_MAC can be a runtime check.

OK. I missed this.

I think there are two options to fix this:

  1. Keep CONFIG_LOGO_MAC_CLUT224 untouched
  2. Remove logo_mac_clut224.ppm

The first option is less controversial but I would like to ask you what
you think about removing the logo_mac_clut224 file.

Here, we are speaking of the Macintosh 68k which ended sales in 1995,
right? So the user base should be rather small, I guess.

And people who still want the custom MAC logo would still be able to add

  CONFIG_LOGO_MAC_CLUT224="path/to/logo_mac_clut224.ppm"

to their config to restore the old behaviour anyway.

My choice would go more toward the removal option but what do you think?


>> -                       logo = &logo_mac_clut224;
>> -#endif
>> -#ifdef CONFIG_LOGO_PARISC_CLUT224
>> -               /* PA-RISC Linux logo */
>> -               logo = &logo_parisc_clut224;
>> -#endif
>> -#ifdef CONFIG_LOGO_SGI_CLUT224
>> -               /* SGI Linux logo on MIPS/MIPS64 */
>> -               logo = &logo_sgi_clut224;
>> -#endif
>> -#ifdef CONFIG_LOGO_SUN_CLUT224
>> -               /* Sun Linux logo */
>> -               logo = &logo_sun_clut224;
>> -#endif
>> -#ifdef CONFIG_LOGO_SUPERH_CLUT224
>> -               /* SuperH Linux logo */
>> -               logo = &logo_superh_clut224;
>> -#endif
>> -       }
>> +
>>         return logo;
>>  }
>>  EXPORT_SYMBOL_GPL(fb_find_logo);


Yours sincerely,
Vincent Mailhol