Re: [PATCH bpf-next v5 1/3] btf: allow mmap of vmlinux btf

On Thu, Jul 17, 2025 at 8:15 AM Lorenz Bauer lmb@isovalent.com wrote:

On Thu, Jul 17, 2025 at 3:49 PM Alexei Starovoitov alexei.starovoitov@gmail.com wrote:

...

__pa_symbol() should work for start_BTF, but would be good to double check with Ard that the rest stays linear.

Alexei,

This code in the arm64 setup does make me think we'll be OK.

kernel_code.start = __pa_symbol(_stext); kernel_code.end = __pa_symbol(__init_begin - 1); kernel_data.start = __pa_symbol(_sdata); kernel_data.end = __pa_symbol(_end - 1);

Using these as start and end only makes sense to me if the addresses are linear? See https://elixir.bootlin.com/linux/v6.15.6/source/arch/arm64/kernel/setup.c#L2...

Thanks for checking. lgtm.