linux-kernel - include/linux/ftrace.h:190:9: error: call to undeclared function 'arch_ftrace_get_regs'; ISO C99 and later do not support implicit function declarations

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Message-ID: <202506191949.o3SMu8Zn-lkp@intel.com>
Date: Thu, 19 Jun 2025 19:21:13 +0800
From: kernel test robot <lkp@...el.com>
To: Andy Chiu <andy.chiu@...ive.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Palmer Dabbelt <palmer@...belt.com>,
	Björn Töpel <bjorn@...osinc.com>,
	Alexandre Ghiti <alexghiti@...osinc.com>
Subject: include/linux/ftrace.h:190:9: error: call to undeclared function
 'arch_ftrace_get_regs'; ISO C99 and later do not support implicit function
 declarations

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   fb4d33ab452ea254e2c319bac5703d1b56d895bf
commit: d0262e907e2991ae09ca476281fc8cae3ec57850 riscv: ftrace: support PREEMPT
date:   2 weeks ago
config: riscv-randconfig-r071-20250619 (https://download.01.org/0day-ci/archive/20250619/202506191949.o3SMu8Zn-lkp@intel.com/config)
compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project 875b36a8742437b95f623bab1e0332562c7b4b3f)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250619/202506191949.o3SMu8Zn-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/202506191949.o3SMu8Zn-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/riscv/kernel/asm-offsets.c:10:
>> include/linux/ftrace.h:190:9: error: call to undeclared function 'arch_ftrace_get_regs'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     190 |         return arch_ftrace_get_regs(fregs);
         |                ^
   include/linux/ftrace.h:190:9: note: did you mean 'ftrace_get_regs'?
   include/linux/ftrace.h:185:40: note: 'ftrace_get_regs' declared here
     185 | static __always_inline struct pt_regs *ftrace_get_regs(struct ftrace_regs *fregs)
         |                                        ^
     186 | {
     187 |         if (!fregs)
     188 |                 return NULL;
     189 | 
     190 |         return arch_ftrace_get_regs(fregs);
         |                ~~~~~~~~~~~~~~~~~~~~
         |                ftrace_get_regs
>> include/linux/ftrace.h:190:9: error: incompatible integer to pointer conversion returning 'int' from a function with result type 'struct pt_regs *' [-Wint-conversion]
     190 |         return arch_ftrace_get_regs(fregs);
         |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   2 errors generated.
   make[3]: *** [scripts/Makefile.build:98: arch/riscv/kernel/asm-offsets.s] Error 1
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1282: prepare0] Error 2
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:248: __sub-make] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:248: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +/arch_ftrace_get_regs +190 include/linux/ftrace.h

762abbc0d09f7a Masami Hiramatsu (Google  2024-12-26  184) 
d19ad0775dcd64 Steven Rostedt (VMware    2020-10-28  185) static __always_inline struct pt_regs *ftrace_get_regs(struct ftrace_regs *fregs)
d19ad0775dcd64 Steven Rostedt (VMware    2020-10-28  186) {
d19ad0775dcd64 Steven Rostedt (VMware    2020-10-28  187) 	if (!fregs)
d19ad0775dcd64 Steven Rostedt (VMware    2020-10-28  188) 		return NULL;
d19ad0775dcd64 Steven Rostedt (VMware    2020-10-28  189) 
02a474ca266a47 Steven Rostedt (VMware    2020-10-27 @190) 	return arch_ftrace_get_regs(fregs);
d19ad0775dcd64 Steven Rostedt (VMware    2020-10-28  191) }
d19ad0775dcd64 Steven Rostedt (VMware    2020-10-28  192) 

:::::: The code at line 190 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