linux-kernel - Re: ld.lld: error: undefined symbol: __kcfi_typeid_ftrace_stub

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Date:   Wed, 26 Oct 2022 08:36:29 -0700
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     kernel test robot <lkp@...el.com>
Cc:     Peter Zijlstra <peterz@...radead.org>, llvm@...ts.linux.dev,
        kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Mark Rutland <mark.rutland@....com>,
        Kees Cook <keescook@...omium.org>
Subject: Re: ld.lld: error: undefined symbol: __kcfi_typeid_ftrace_stub_graph

On Tue, Oct 25, 2022 at 1:22 AM kernel test robot <lkp@...el.com> wrote:
> >> ld.lld: error: undefined symbol: __kcfi_typeid_ftrace_stub_graph
>    >>> referenced by entry-ftrace.S:299 (arch/arm64/kernel/entry-ftrace.S:299)
>    >>>               arch/arm64/kernel/entry-ftrace.o:(.text+0x48) in archive vmlinux.a

We don't seem to have any C translation units that would take the
address of ftrace_stub_graph with this config, which means the
compiler won't generate the __kcfi_typeid_ftrace_stub_graph symbol.
Adding __ADDRESSABLE(ftrace_stub_graph) to a suitable place would fix
this issue, perhaps somewhere in arch/arm64/kernel/ftrace.c?

Sami