Missing <linux/kcmp.h> breaks build on CentOS 7

[lgorenstein]

Hello, and thank you for the great tool!

Reporting a problem with building NVTOP on an HPC cluster here. CentOS 7.9, kernel 3.10.0-1160.62.1.el7.x86_64, CUDA 11.7. Cmake part goes fine, but the build dies near the end:

[ 92%] Building C object src/CMakeFiles/nvtop.dir/extract_gpuinfo_amdgpu.c.o
/home/lev/software/nvtop/2.0.2/nvtop/src/extract_gpuinfo_amdgpu.c:36:24: fatal error: linux/kcmp.h: No such file or directory
 #include <linux/kcmp.h>
                        ^
compilation terminated.
make[2]: *** [src/CMakeFiles/nvtop.dir/extract_gpuinfo_amdgpu.c.o] Error 1
make[1]: *** [src/CMakeFiles/nvtop.dir/all] Error 2

Builds fine on Rocky 8.4 and Ubuntu 18.04 with 4. kernels, but not on older systems with kernel 3.. Is there a way to avoid/bypass dependency on this header?

[Syllo]

According to the kcmp manual page (https://linux.die.net/man/2/kcmp), the syscall was introduced in the linux kernel 3.5.

In your case you might need to install the kernel headers for your kernel. The standard yum way: yum install kernel-devel

[Syllo]

If you don't have AMD GPUs you can also pass -DAMDGPU_SUPPORT=OFF to cmake

[Syllo]

Closing since the AMDGPU support can be disabled on old kernels (Linux 3.10 is from 2013). Support for AMDGPU would probably not work as expected on this version anyway.

[kcgthb]

I'm afraid disabling AMDGPU support doesn't solve this issue (anymore?).

In nvtop 3.0.1, kernel 3.10.0-1160.88.1.el7.x86_64:

# cmake -DNVIDIA_SUPPORT=ON -DAMDGPU_SUPPORT=OFF -DINTEL_SUPPORT=OFF  ..
[...]
# make
[...]
[ 53%] Building C object src/CMakeFiles/nvtop.dir/extract_gpuinfo.c.o
[ 60%] Building C object src/CMakeFiles/nvtop.dir/extract_processinfo_fdinfo.c.o
/dev/shm/nvtop-3.0.1/src/extract_processinfo_fdinfo.c:28:24: fatal error: linux/kcmp.h: No such file or directory
 #include <linux/kcmp.h>
                        ^
compilation terminated.

[Lacedaemon]

https://github.com/Syllo/nvtop/issues/195#issuecomment-1590262915 worked for me.

[lgorenstein]

As long as defined constants stay constant :)

Thank you for the tip @Lacedaemon, I'll try this trick here.

[zhuyifei1999]

As long as defined constants stay constant :)

It won't. They are kernel UAPI, so as long as it's Linux it won't change.