linux-kernel - Re: [peterz-queue:locking/core 2/4] ld.lld: error: undefined symbol: jump_label_apply

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Message-ID: <CAMj1kXHjzwYfoF0ut+7SzToAd35hRnTF0ppODvL0fPUyVQimDQ@mail.gmail.com>
Date:   Sat, 18 Jun 2022 10:10:23 +0200
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        kernel test robot <lkp@...el.com>
Subject: Re: [peterz-queue:locking/core 2/4] ld.lld: error: undefined symbol: jump_label_apply_nops

On Fri, 17 Jun 2022 at 23:54, kernel test robot <lkp@...el.com> wrote:
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git locking/core
> head:   c4e2db802ebbc639960404b97c9b8a6284634428
> commit: 74c632a2a5738bd18864610e34f6b6d2db664bb7 [2/4] jump_label: mips: move module NOP patching into arch code
> config: mips-randconfig-r026-20220617 (https://download.01.org/0day-ci/archive/20220618/202206180532.mOqwM8Wu-lkp@intel.com/config)
> compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project d764aa7fc6b9cc3fbe960019018f5f9e941eb0a6)
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # install mips cross compiling tool for clang build
>         # apt-get install binutils-mipsel-linux-gnu
>         # https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?id=74c632a2a5738bd18864610e34f6b6d2db664bb7
>         git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git
>         git fetch --no-tags peterz-queue locking/core
>         git checkout 74c632a2a5738bd18864610e34f6b6d2db664bb7
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash
>
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@...el.com>
>
> All errors (new ones prefixed by >>):
>
> >> ld.lld: error: undefined symbol: jump_label_apply_nops
>    >>> referenced by module.c
>    >>>               kernel/module.o:(module_finalize) in archive arch/mips/built-in.a
>

Aargh.

--- a/arch/mips/kernel/jump_label.c
+++ b/arch/mips/kernel/jump_label.c
@@ -89,7 +89,7 @@ void arch_jump_label_transform(struct jump_entry *e,
        mutex_unlock(&text_mutex);
 }

-#ifdef CONFIG_MODULE
+#ifdef CONFIG_MODULES
 void jump_label_apply_nops(struct module *mod)
 {
        struct jump_entry *iter_start = mod->jump_entries;

Sorry about that.