arch/riscv/kernel/ftrace.c:15:5: sparse: sparse: context imbalance in 'ftrace_arch_code_modify_prepare' - wrong count at exit

[kernel test robot <lkp@intel.com>]

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CC: kbuild-all(a)lists.01.org
CC: linux-kernel(a)vger.kernel.org
TO: Zong Li <zong.li@sifive.com>
CC: Palmer Dabbelt <palmerdabbelt@google.com>
CC: Masami Hiramatsu <mhiramat@kernel.org>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   865c50e1d279671728c2936cb7680eb89355eeea
commit: 0ff7c3b331276f584bde3ae9a16bacd8fa3d01e6 riscv: Use text_mutex instead of patch_lock
date:   5 months ago
:::::: branch date: 8 hours ago
:::::: commit date: 5 months ago
config: riscv-randconfig-s032-20201013 (attached as .config)
compiler: riscv64-linux-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.3-rc1-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0ff7c3b331276f584bde3ae9a16bacd8fa3d01e6
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 0ff7c3b331276f584bde3ae9a16bacd8fa3d01e6
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=riscv 

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


"sparse warnings: (new ones prefixed by >>)"
>> arch/riscv/kernel/ftrace.c:15:5: sparse: sparse: context imbalance in 'ftrace_arch_code_modify_prepare' - wrong count at exit
>> arch/riscv/kernel/ftrace.c:21:5: sparse: sparse: context imbalance in 'ftrace_arch_code_modify_post_process' - wrong count at exit

vim +/ftrace_arch_code_modify_prepare +15 arch/riscv/kernel/ftrace.c

10626c32e3827b Alan Kao 2017-12-18  13  
c15ac4fd60d5ff Alan Kao 2018-02-13  14  #ifdef CONFIG_DYNAMIC_FTRACE
0ff7c3b331276f Zong Li  2020-04-21 @15  int ftrace_arch_code_modify_prepare(void) __acquires(&text_mutex)
0ff7c3b331276f Zong Li  2020-04-21  16  {
0ff7c3b331276f Zong Li  2020-04-21  17  	mutex_lock(&text_mutex);
0ff7c3b331276f Zong Li  2020-04-21  18  	return 0;
0ff7c3b331276f Zong Li  2020-04-21  19  }
0ff7c3b331276f Zong Li  2020-04-21  20  
0ff7c3b331276f Zong Li  2020-04-21 @21  int ftrace_arch_code_modify_post_process(void) __releases(&text_mutex)
0ff7c3b331276f Zong Li  2020-04-21  22  {
0ff7c3b331276f Zong Li  2020-04-21  23  	mutex_unlock(&text_mutex);
0ff7c3b331276f Zong Li  2020-04-21  24  	return 0;
0ff7c3b331276f Zong Li  2020-04-21  25  }
0ff7c3b331276f Zong Li  2020-04-21  26  

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

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