[PATCH] riscv: fix oops caused by irq on/off tracer

[kernel test robot]

Hi Changbin,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.17-rc1 next-20220128]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Changbin-Du/riscv-fix-oops-caused-by-irq-on-off-tracer/20220128-233136
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 145d9b498fc827b79c1260b4caa29a8e59d4c2b9
config: riscv-buildonly-randconfig-r003-20220127 (https://download.01.org/0day-ci/archive/20220129/202201290448.aKF0qISQ-lkp@intel.com/config)
compiler: riscv32-linux-gcc (GCC) 11.2.0
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
        # https://github.com/0day-ci/linux/commit/d3adbc803a5b4d49e649489eec980048266e2a72
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Changbin-Du/riscv-fix-oops-caused-by-irq-on-off-tracer/20220128-233136
        git checkout d3adbc803a5b4d49e649489eec980048266e2a72
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=riscv SHELL=/bin/bash arch/riscv/kernel/

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

All warnings (new ones prefixed by >>):

>> arch/riscv/kernel/trace_irq.c:14:6: warning: no previous prototype for '__trace_hardirqs_on' [-Wmissing-prototypes]
      14 | void __trace_hardirqs_on(void)
         |      ^~~~~~~~~~~~~~~~~~~
>> arch/riscv/kernel/trace_irq.c:20:6: warning: no previous prototype for '__trace_hardirqs_off' [-Wmissing-prototypes]
      20 | void __trace_hardirqs_off(void)
         |      ^~~~~~~~~~~~~~~~~~~~
--
>> arch/riscv/kernel/trace_irq.c:10: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
    * trace_hardirqs_on/off requires at least two parent call frames. Here we add


vim +/__trace_hardirqs_on +14 arch/riscv/kernel/trace_irq.c

     8	
     9	/**
  > 10	 * trace_hardirqs_on/off requires at least two parent call frames. Here we add
    11	 * one extra level so they can be safely called by low level entry code.
    12	 */
    13	
  > 14	void __trace_hardirqs_on(void)
    15	{
    16		trace_hardirqs_on();
    17	}
    18	NOKPROBE_SYMBOL(__trace_hardirqs_on);
    19	
  > 20	void __trace_hardirqs_off(void)

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