linux-kernel - include/linux/ftrace.h:138:9: error: implicit declaration of function 'arch_ftrace_get_regs'; did you mean 'ftrace_get

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Message-ID: <202504271318.HcDiD4fX-lkp@intel.com>
Date: Sun, 27 Apr 2025 13:53:35 +0800
From: kernel test robot <lkp@...el.com>
To: Puranjay Mohan <puranjay@...nel.org>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Palmer Dabbelt <palmer@...osinc.com>,
	Björn Töpel <bjorn@...osinc.com>
Subject: include/linux/ftrace.h:138:9: error: implicit declaration of
 function 'arch_ftrace_get_regs'; did you mean 'ftrace_get_regs'?

Hi Puranjay,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   02ddfb981de88a2c15621115dd7be2431252c568
commit: 7caa9765465f60b6d88e22264892cee12d971888 ftrace: riscv: move from REGS to ARGS
date:   11 months ago
config: riscv-randconfig-r132-20250427 (https://download.01.org/0day-ci/archive/20250427/202504271318.HcDiD4fX-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 8.5.0
reproduce: (https://download.01.org/0day-ci/archive/20250427/202504271318.HcDiD4fX-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202504271318.HcDiD4fX-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/riscv/kernel/asm-offsets.c:12:
   include/linux/ftrace.h: In function 'ftrace_get_regs':
>> include/linux/ftrace.h:138:9: error: implicit declaration of function 'arch_ftrace_get_regs'; did you mean 'ftrace_get_regs'? [-Werror=implicit-function-declaration]
     return arch_ftrace_get_regs(fregs);
            ^~~~~~~~~~~~~~~~~~~~
            ftrace_get_regs
   include/linux/ftrace.h:138:9: warning: returning 'int' from a function with return type 'struct pt_regs *' makes pointer from integer without a cast [-Wint-conversion]
     return arch_ftrace_get_regs(fregs);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors
   make[3]: *** [scripts/Makefile.build:117: arch/riscv/kernel/asm-offsets.s] Error 1
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1203: prepare0] Error 2
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:240: __sub-make] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:240: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +138 include/linux/ftrace.h

d19ad0775dcd64 Steven Rostedt (VMware  2020-10-28  132) 
d19ad0775dcd64 Steven Rostedt (VMware  2020-10-28  133) static __always_inline struct pt_regs *ftrace_get_regs(struct ftrace_regs *fregs)
d19ad0775dcd64 Steven Rostedt (VMware  2020-10-28  134) {
d19ad0775dcd64 Steven Rostedt (VMware  2020-10-28  135) 	if (!fregs)
d19ad0775dcd64 Steven Rostedt (VMware  2020-10-28  136) 		return NULL;
d19ad0775dcd64 Steven Rostedt (VMware  2020-10-28  137) 
02a474ca266a47 Steven Rostedt (VMware  2020-10-27 @138) 	return arch_ftrace_get_regs(fregs);
d19ad0775dcd64 Steven Rostedt (VMware  2020-10-28  139) }
d19ad0775dcd64 Steven Rostedt (VMware  2020-10-28  140) 

:::::: The code at line 138 was first introduced by commit
:::::: 02a474ca266a47ea8f4d5a11f4ffa120f83730ad ftrace/x86: Allow for arguments to be passed in to ftrace_regs by default

:::::: TO: Steven Rostedt (VMware) <rostedt@...dmis.org>
:::::: CC: Steven Rostedt (VMware) <rostedt@...dmis.org>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki