Bug 817764 – x11-drivers/nvidia-drivers-460.91.03 does not compile for kernel 5.10.61 (nv-pat.c:53:5: error: implicit declaration of function '__flush_tlb')

• Product: Gentoo Linux
• Status: RESOLVED FIXED

[Description thomas 2021-10-11 06:25:14 UTC]

I wanted to switch from kernel 5.4.80-r1 to 5.10.61, but the mentioned nvidia driver does not compile for this kernel.
I do not want to use a 470.* driver because switching monitor input programmatically does not work there for my gfx card.
But 460.91.03 is still available in portage, so it should compile.

Reproducible: Always

Steps to Reproduce:
1. Try to compile nvidia driver for kernel 5.10.61
2.
3.
Actual Results:  
Compile fails.

Expected Results:  
Should compile.

Going to attach the build log.

[Comment 1 thomas 2021-10-11 06:27:24 UTC]

Created attachment 744423 [details]
build.log

[Comment 2 Ionen Wolkens 2021-10-11 12:49:39 UTC]

Seems nvidia's own fallback PAT implementation is broken with newer kernels.

But it's using this fallback most likely because you don't have CONFIG_X86_PAT=y in your kernel's .config (normally this is default and only visible with EXPERT=y), please check.

I'll update the ebuild to check for this option after more testing.

[Comment 3 thomas 2021-10-11 13:24:59 UTC]

Yes, you are right. CONFIG_X86_PAT was not set, I don't know why.

After setting this option, the driver compiled.

Thanks for the quick response and help!

[Comment 4 Larry the Git Cow 2021-10-11 13:59:51 UTC]

The bug has been closed via the following commit(s):

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=b7e8fd33216e094df447d2b5a1a20d15616f8fd9

commit b7e8fd33216e094df447d2b5a1a20d15616f8fd9
Author:     Ionen Wolkens <[e-mail]>
AuthorDate: 2021-10-11 13:27:28 +0000
Commit:     Ionen Wolkens <[e-mail]>
CommitDate: 2021-10-11 13:58:06 +0000

    x11-drivers/nvidia-drivers: check for CONFIG_X86_PAT
    
    NVIDIA has a fallback implementation if unset, but it uses
    __flush_tlb removed on x86 since >=5.8 kernels (albeit fairly
    unlikely to be unset given default and gated behind EXPERT=y).
    
    All versions are affected.
    
    Closes: https://bugs.gentoo.org/817764
    Signed-off-by: Ionen Wolkens <[e-mail]>

 x11-drivers/nvidia-drivers/nvidia-drivers-390.144.ebuild   | 2 ++
 x11-drivers/nvidia-drivers/nvidia-drivers-460.91.03.ebuild | 2 ++
 x11-drivers/nvidia-drivers/nvidia-drivers-470.62.05.ebuild | 2 ++
 x11-drivers/nvidia-drivers/nvidia-drivers-470.63.01.ebuild | 2 ++
 x11-drivers/nvidia-drivers/nvidia-drivers-470.74.ebuild    | 2 ++
 5 files changed, 10 insertions(+)