[Bug]: implicit declaration of function ‘drm_fb_helper_alloc_info’

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Évaluation

Difficulté
4/5
Temps estimé
3-5 jours
Accessibilité débutants
48/100
Type d'issue
Bug
Clarté
Plutôt claire
Activité
Active
Stack technique
c, linux
Domaine
backend

Piste de recherche

The failure is reported in guest additions at /tmp/vbox.0/vbox_fb.c:337 while building against Ubuntu’s Linux 6.8 kernel; the issue also says the build succeeds with 5.15. Start by reading the corresponding vbox_fb.c code and the uploaded build logs, then compare the kernel interfaces used by both versions. Done means guest additions compile successfully against 6.8 without breaking the reported 5.15 build.

Rédigé par le modèle d'indexation à partir du texte de l'issue.

Description

bug
Version

7.2.22

Host OS Type

Windows

Host OS name + version

Version 10.0.19045.7846

Host Architecture

x86

Guest OS Type

Linux

Guest Architecture

x86

Guest OS name + version

Ubuntu 22.04.5 LTS

Component

Guest Additions/Other

What happened?

Compiling guest additions in the process of routine upgrade of the kernel to 6.8.0-149 in Ubuntu 22.04.5 LTS I am getting (via apt upgrade):

warning: the compiler differs from the one used to build the kernel
  The kernel was built by: x86_64-linux-gnu-gcc-12 (Ubuntu 
12.3.0-1ubuntu1~22.04.3) 12.3.0
  You are using:           gcc-12 (Ubuntu 12.3.0-1ubuntu1~22.04.3) 12.3.0

Why is that? They look quite identical to me!

This is fatal, though:

/tmp/vbox.0/vbox_fb.c:337:16: error: implicit declaration of function 
‘drm_fb_helper_alloc_info’; did you mean ‘drm_fb_helper_fill_info’? 
[-Werror=implicit-function-declaration]
  337 |         info = drm_fb_helper_alloc_info(helper);
      |                ^~~~~~~~~~~~~~~~~~~~~~~~
      |                drm_fb_helper_fill_info
/tmp/vbox.0/vbox_fb.c:337:14: warning: assignment to ‘struct fb_info *’ 
from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
  337 |         info = drm_fb_helper_alloc_info(helper);
      |              ^
cc1: some warnings being treated as errors
make[2]: *** [scripts/Makefile.build:243: /tmp/vbox.0/vbox_fb.o] Error 1
make[2]: *** Waiting for unfinished jobs....
# cmd_gen_objtooldep /tmp/vbox.0/vbox_drv.o

Meanwhile, kernel 5.15.0-203 (which comes in the same upgrade) compiled guest additions without any issues.

I'm using the most up to date VirtualBx 7.2.22-175245 with its current extension package of the same version (7.2.22)

How can we reproduce this?

I don't know how can "you" reproduce this, but it's obviously a compilation bug suggesting that some feature macros (such as for the kernel version number) were not placed around the pieces of code, which are version-dependent (because an earlier kernel 5.15.0-203 does not show the same problem).

Did you upload all of your necessary log files, screenshots, etc.?
  • Yes, I've uploaded all pertinent files to this issue.
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