Re: [PATCH dwarves] btf_encoder: Keep the source prototype of kfuncs

[Breno Leitao <leitao@debian.org>]

Hello Alan,

On Thu, Nov 12, 2026 at 12:36:29PM +0000, Alan Maguire wrote:
> > Reported-by: Breno Leitao <leitao@debian.org>
> 
> I'm having trouble reproducing the original failure; would you mind sharing
> the config that reproduces it? I tried with clang 22, but no luck so far.

This reproduces it on x86_64, with next-20261111, clang 22.1.3 and
pahole master (9eb594d):

    # make LLVM=1 x86_64_defconfig
    # ./scripts/config -e BPF_SYSCALL -e BPF_JIT -e CGROUP_BPF \
            -d DEBUG_INFO_NONE -e DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT \
            -e DEBUG_INFO_BTF -e KCSAN -e UBSAN -e WERROR
    # make LLVM=1 olddefconfig
    # make LLVM=1 -j$(nproc) vmlinux
    [...]
      BTF     .tmp_vmlinux1
    WARN: resolve_btfids: no BTF func for kfunc bpf_tcp_ops_set_rcvlowat in bpf_tcp_ops_set_rcvlowat_kfunc_set
    WARN: resolve_btfids: unresolved symbol bpf_tcp_ops_set_rcvlowat
    Failed to generate BTF for vmlinux

let me know if you are not able to, and I will send you my full .config

Thanks,
--breno