Re: [PATCH v4 bpf-next 2/6] bpf, x86: Support unwind_goto and unwind_exit

["Alexei Starovoitov" <alexei.starovoitov@gmail.com>]

On Wed Oct 21, 2026 at 8:14 PM UTC, Nathan Chancellor wrote:
> After this change landed in -next as commit cff94a3d78d8 ("bpf, x86:
> Support unwind_goto and unwind_exit"), I am seeing the following objtool
> warning when building with LLVM 23.1.4 and a recent tip of tree version
> of LLVM 24 with the attached configuration (which can become an error
> with CONFIG_OBJTOOL_WERROR):
>
>   vmlinux.o: warning: objtool: do_jit+0x1330: relocation to !ENDBR: .text+0xc7fab
>
> Something like the below diff appears to inhibit this but I am not sure
> if it is too big of a hammer or if there is a better solution, hence
> just the report and deferring to you, but maybe it is a good starting
> point.
>
> diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
> index d3ab36281144..b80f05f377c2 100644
> --- a/arch/x86/net/bpf_jit_comp.c
> +++ b/arch/x86/net/bpf_jit_comp.c
> @@ -641,6 +641,7 @@ static int emit_patch(u8 **pprog, void *func, void *ip, u8 opcode)
>  
>  static int emit_call(u8 **pprog, void *func, void *ip)
>  {
> +	OPTIMIZER_HIDE_VAR(func);
>  	return emit_patch(pprog, func, ip, 0xE8);
>  }

Thanks for the report.
Sent a fix. Pls test it in your setup.