On Thu, 29 Feb 2024 13:38:12 +0100 Bastian Blank <
waldi@debian.org> wrote:
> On Thu, Feb 29, 2024 at 12:12:21PM +0000, Luca Boccassi wrote:
> > With the new vmlinux.h shipped in the headers package, the BTF case
> > should be covered.
>
> The relevant code in Linux is:
>
> | quiet_cmd_btf_ko = BTF [M] $@
> | cmd_btf_ko = \
> | if [ ! -f vmlinux ]; then \
> | printf "Skipping BTF generation for %s due to unavailability of vmlinux\n" $@ 1>&2; \
> | else \
> | LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J $(PAHOLE_FLAGS) --btf_base vmlinux $@; \
> | $(RESOLVE_BTFIDS) -b vmlinux $@; \
> | fi;
>
> Which change is needed here to use vmlinux.h instead?
My understanding is that you don't need this command at all; the included vmlinux.h already contains the necessary type definitions for libbpf, for the kernel source version in question - ie: instead of needing to run pahole or bpftool to extract these definitions from a specific vmlinux image, this file is distributed with them already included.