Messages in this thread | | | Date | Fri, 26 Nov 2021 09:55:25 +0800 | From | kernel test robot <> | Subject | kernel/module.c:4478:14: warning: variable 'exit' set but not used |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 8ced7ca3570333998ad2088d5a6275701970e28e commit: 0d67e332e6df72f43eaa21228daa3a79e23093f3 module: fix clang CFI with MODULE_UNLOAD=n date: 8 weeks ago config: arm64-randconfig-r015-20211123 (https://download.01.org/0day-ci/archive/20211126/202111260932.G88s9JDN-lkp@intel.com/config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 49e3838145dff1ec91c2e67a2cb562775c8d2a08) 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 arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0d67e332e6df72f43eaa21228daa3a79e23093f3 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 0d67e332e6df72f43eaa21228daa3a79e23093f3 # save the config file to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm64
If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@intel.com>
All warnings (new ones prefixed by >>):
>> kernel/module.c:4478:14: warning: variable 'exit' set but not used [-Wunused-but-set-variable] exitcall_t *exit; ^ 1 warning generated.
vim +/exit +4478 kernel/module.c
^1da177e4c3f41 Linus Torvalds 2005-04-16 4473 cf68fffb66d60d Sami Tolvanen 2021-04-08 4474 static void cfi_init(struct module *mod) cf68fffb66d60d Sami Tolvanen 2021-04-08 4475 { cf68fffb66d60d Sami Tolvanen 2021-04-08 4476 #ifdef CONFIG_CFI_CLANG cf68fffb66d60d Sami Tolvanen 2021-04-08 4477 initcall_t *init; cf68fffb66d60d Sami Tolvanen 2021-04-08 @4478 exitcall_t *exit; cf68fffb66d60d Sami Tolvanen 2021-04-08 4479 cf68fffb66d60d Sami Tolvanen 2021-04-08 4480 rcu_read_lock_sched(); cf68fffb66d60d Sami Tolvanen 2021-04-08 4481 mod->cfi_check = (cfi_check_fn) cf68fffb66d60d Sami Tolvanen 2021-04-08 4482 find_kallsyms_symbol_value(mod, "__cfi_check"); cf68fffb66d60d Sami Tolvanen 2021-04-08 4483 init = (initcall_t *) cf68fffb66d60d Sami Tolvanen 2021-04-08 4484 find_kallsyms_symbol_value(mod, "__cfi_jt_init_module"); cf68fffb66d60d Sami Tolvanen 2021-04-08 4485 exit = (exitcall_t *) cf68fffb66d60d Sami Tolvanen 2021-04-08 4486 find_kallsyms_symbol_value(mod, "__cfi_jt_cleanup_module"); cf68fffb66d60d Sami Tolvanen 2021-04-08 4487 rcu_read_unlock_sched(); cf68fffb66d60d Sami Tolvanen 2021-04-08 4488 cf68fffb66d60d Sami Tolvanen 2021-04-08 4489 /* Fix init/exit functions to point to the CFI jump table */ cf68fffb66d60d Sami Tolvanen 2021-04-08 4490 if (init) cf68fffb66d60d Sami Tolvanen 2021-04-08 4491 mod->init = *init; 0d67e332e6df72 Arnd Bergmann 2021-09-27 4492 #ifdef CONFIG_MODULE_UNLOAD cf68fffb66d60d Sami Tolvanen 2021-04-08 4493 if (exit) cf68fffb66d60d Sami Tolvanen 2021-04-08 4494 mod->exit = *exit; 0d67e332e6df72 Arnd Bergmann 2021-09-27 4495 #endif cf68fffb66d60d Sami Tolvanen 2021-04-08 4496 cf68fffb66d60d Sami Tolvanen 2021-04-08 4497 cfi_module_add(mod, module_addr_min); cf68fffb66d60d Sami Tolvanen 2021-04-08 4498 #endif cf68fffb66d60d Sami Tolvanen 2021-04-08 4499 } cf68fffb66d60d Sami Tolvanen 2021-04-08 4500
:::::: The code at line 4478 was first introduced by commit :::::: cf68fffb66d60d96209446bfc4a15291dc5a5d41 add support for Clang CFI
:::::: TO: Sami Tolvanen <samitolvanen@google.com> :::::: CC: Kees Cook <keescook@chromium.org>
--- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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