nvidia 370.23 not compiling against rt-patched kernel

nvidia 370.23 not compiling against rt-patched kernel

[Bernhard Landauer]

Latest nvidia 370.23 driver is unhappy with 'rt_mutex_destroy' and the 
extramodule fails to build with

FATAL: modpost: GPL-incompatible module nvidia-drm.ko uses GPL-only 
symbol 'rt_mutex_destroy'

This concerns 4.6.5_rt10 aswell as 4.4.17_rt25 at least
What can we do about that?

kind regards
Bernhard Landauer

Re: nvidia 370.23 not compiling against rt-patched kernel

[Sebastian Andrzej Siewior]

On 2016-08-18 20:57:34 [+0200], Bernhard Landauer wrote:
> Latest nvidia 370.23 driver is unhappy with 'rt_mutex_destroy' and the
> extramodule fails to build with
> 
> FATAL: modpost: GPL-incompatible module nvidia-drm.ko uses GPL-only symbol
> 'rt_mutex_destroy'
> 
> This concerns 4.6.5_rt10 aswell as 4.4.17_rt25 at least
> What can we do about that?

This is not -RT only related. An unpatched kernel should have the same
problem. The EXPORT_SYMBOL_GPL(mutex_destroy) is here since commit
408894ee4dd4 ("[PATCH] mutex subsystem, debugging code") / v2.6.16 by
Ingo Molnar.

You could disable CONFIG_DEBUG_MUTEXES or look for alternatives for this
driver.

> kind regards
> Bernhard Landauer

Sebastian