Hi Masami,

I love your patch! Yet something to improve:

[auto build test ERROR on rostedt-trace/for-next]
[also build test ERROR on tip/x86/core linus/master v5.17-rc1 next-20220124]
[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/Masami-Hiramatsu/fprobe-Introduce-fprobe-function-entry-exit-probe/20220125-001253
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git for-next
config: i386-tinyconfig (https://download.01.org/0day-ci/archive/20220125/202201250509.MSbKNePn-lkp@intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/6366c7f830e71242dd9538fbdb09acdccea6e786
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Masami-Hiramatsu/fprobe-Introduce-fprobe-function-entry-exit-probe/20220125-001253
        git checkout 6366c7f830e71242dd9538fbdb09acdccea6e786
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/kernel/

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

All errors (new ones prefixed by >>):

   In file included from arch/x86/kernel/process.c:48:
   arch/x86/include/asm/unwind.h: In function 'unwind_recover_kretprobe':
>> arch/x86/include/asm/unwind.h:113:17: error: 'struct unwind_state' has no member named 'kr_cur'
     113 |           &state->kr_cur);
         |                 ^~
   arch/x86/kernel/process.c: At top level:
   arch/x86/kernel/process.c:887:13: warning: no previous prototype for 'arch_post_acpi_subsys_init' [-Wmissing-prototypes]
     887 | void __init arch_post_acpi_subsys_init(void)
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~
--
   In file included from arch/x86/kernel/unwind_guess.c:7:
   arch/x86/include/asm/unwind.h: In function 'unwind_recover_kretprobe':
>> arch/x86/include/asm/unwind.h:113:17: error: 'struct unwind_state' has no member named 'kr_cur'
     113 |           &state->kr_cur);
         |                 ^~


vim +113 arch/x86/include/asm/unwind.h

   106	
   107	static inline
   108	unsigned long unwind_recover_kretprobe(struct unwind_state *state,
   109					       unsigned long addr, unsigned long *addr_p)
   110	{
   111		if (IS_ENABLED(CONFIG_RETHOOK) && is_rethook_trampoline(addr))
   112			return rethook_find_ret_addr(state->task, (unsigned long)addr_p,
 > 113						     &state->kr_cur);
   114	#ifdef CONFIG_KRETPROBES
   115		return is_kretprobe_trampoline(addr) ?
   116			kretprobe_find_ret_addr(state->task, addr_p, &state->kr_cur) :
   117			addr;
   118	#else
   119		return addr;
   120	#endif
   121	}
   122	

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