Re: [PATCH bpf v2] samples: bpf: Fix vmlinux.h generation for XDP samples

["Toke Høiland-Jørgensen" <toke@redhat.com>]

Kumar Kartikeya Dwivedi <memxor@gmail.com> writes:

> Generate vmlinux.h only from the in-tree vmlinux, and remove enum
> declarations that would cause a build failure in case of version
> mismatches.
>
> There are now two options when building the samples:
> 1. Compile the kernel to use in-tree vmlinux for vmlinux.h
> 2. Override VMLINUX_BTF for samples using something like this:
>    make VMLINUX_BTF=/sys/kernel/btf/vmlinux -C samples/bpf
>
> This change was tested with relative builds, e.g. cases like:
>  * make O=build -C samples/bpf
>  * make KBUILD_OUTPUT=build -C samples/bpf
>  * make -C samples/bpf
>  * cd samples/bpf && make
>
> When a suitable VMLINUX_BTF is not found, the following message is
> printed:
> /home/kkd/src/linux/samples/bpf/Makefile:333: *** Cannot find a vmlinux
> for VMLINUX_BTF at any of "  ./vmlinux", build the kernel or set
> VMLINUX_BTF variable.  Stop.
>
> Cc: Toke Høiland-Jørgensen <toke@redhat.com>
> Fixes: 384b6b3bbf0d (samples: bpf: Add vmlinux.h generation support)
> Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>