Re: [PATCH bpf-next 1/2] bpf: Add a bpf_kallsyms_lookup helper

[Florent Revest]

On Tue, Dec 22, 2020 at 3:18 PM Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:
>
> FYI, there is a reason why kallsyms_lookup is not exported any more.
> I don't think adding that back through a backdoor is a good idea.

Did you maybe mean kallsyms_lookup_name (the one that looks an address
up based on a symbol name) ? It used to be exported but isn't anymore
indeed.
However, this is not what we're trying to do. As far as I can tell,
kallsyms_lookup (the one that looks a symbol name up based on an
address) has never been exported but its close cousins sprint_symbol
and sprint_symbol_no_offset (which only call kallsyms_lookup and
pretty print the result) are still exported, they are also used by
vsprintf. Is this an issue ?