linux-kernel - kernel/trace/ftrace.c:7157:20: error: unused function 'ftrace_startup

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Date:   Sun, 13 Feb 2022 21:03:29 +0800
From:   kernel test robot <lkp@...el.com>
To:     chongjiapeng <jiapeng.chong@...ux.alibaba.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>
Subject: kernel/trace/ftrace.c:7157:20: error: unused function
 'ftrace_startup_enable'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   b81b1829e7e39f6cebdf6e4d5484eacbceda8554
commit: 172f7ba9772cae12f099fc563352e905dc9a1921 ftrace: Make ftrace_profile_pages_init static
date:   4 months ago
config: arm-randconfig-r001-20220213 (https://download.01.org/0day-ci/archive/20220213/202202132037.4aN017dU-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 478c237e21b2c3a83e46f26fcbeb3876682f9b14)
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 arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=172f7ba9772cae12f099fc563352e905dc9a1921
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 172f7ba9772cae12f099fc563352e905dc9a1921
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/gpu/drm/ kernel/trace/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

>> kernel/trace/ftrace.c:7157:20: error: unused function 'ftrace_startup_enable' [-Werror,-Wunused-function]
   static inline void ftrace_startup_enable(int command) { }
                      ^
   1 error generated.


vim +/ftrace_startup_enable +7157 kernel/trace/ftrace.c

0b6e4d56bf7186 Frederic Weisbecker      2008-10-28  7155  
8434dc9340cd2e Steven Rostedt (Red Hat  2015-01-20  7156) static inline int ftrace_init_dyn_tracefs(struct dentry *d_tracer) { return 0; }
df4fc31558dd2a Steven Rostedt           2008-11-26 @7157  static inline void ftrace_startup_enable(int command) { }
e1effa0144a1dd Steven Rostedt (Red Hat  2014-08-05  7158) static inline void ftrace_startup_all(int command) { }
8a56d7761d2d04 Steven Rostedt (Red Hat  2013-11-25  7159) 

:::::: The code at line 7157 was first introduced by commit
:::::: df4fc31558dd2a3a30292ddb3a64c2a5befcec73 ftrace: add function tracing to single thread

:::::: TO: Steven Rostedt <srostedt@...hat.com>
:::::: CC: Ingo Molnar <mingo@...e.hu>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org