linux-kernel - include/linux/ftrace.h:138:9: 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: <202501270111.x1TyJKg8-lkp@intel.com>
Date: Mon, 27 Jan 2025 01:32:35 +0800
From: kernel test robot <lkp@...el.com>
To: Puranjay Mohan <puranjay@...nel.org>
Cc: llvm@...ts.linux.dev, 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: call to undeclared function
 'arch_ftrace_get_regs'; ISO C99 and later do not support implicit function
 declarations

Hi Puranjay,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   aa22f4da2a46b484a257d167c67a2adc1b7aaf68
commit: 7caa9765465f60b6d88e22264892cee12d971888 ftrace: riscv: move from REGS to ARGS
date:   8 months ago
config: riscv-randconfig-002-20250127 (https://download.01.org/0day-ci/archive/20250127/202501270111.x1TyJKg8-lkp@intel.com/config)
compiler: clang version 16.0.6 (https://github.com/llvm/llvm-project 7cbf1a2591520c2491aa35339f227775f4d3adf6)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250127/202501270111.x1TyJKg8-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/202501270111.x1TyJKg8-lkp@intel.com/

All errors (new ones prefixed by >>):

   scripts/genksyms/parse.y: warning: 9 shift/reduce conflicts [-Wconflicts-sr]
   scripts/genksyms/parse.y: warning: 5 reduce/reduce conflicts [-Wconflicts-rr]
   scripts/genksyms/parse.y: note: rerun with option '-Wcounterexamples' to generate conflict counterexamples
   In file included from arch/riscv/kernel/asm-offsets.c:12:
>> include/linux/ftrace.h:138:9: error: call to undeclared function 'arch_ftrace_get_regs'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
           return arch_ftrace_get_regs(fregs);
                  ^
   include/linux/ftrace.h:138:9: note: did you mean 'ftrace_get_regs'?
   include/linux/ftrace.h:133:40: note: 'ftrace_get_regs' declared here
   static __always_inline struct pt_regs *ftrace_get_regs(struct ftrace_regs *fregs)
                                          ^
>> include/linux/ftrace.h:138:9: error: incompatible integer to pointer conversion returning 'int' from a function with result type 'struct pt_regs *' [-Wint-conversion]
           return arch_ftrace_get_regs(fregs);
                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   2 errors generated.
   make[3]: *** [scripts/Makefile.build:117: arch/riscv/kernel/asm-offsets.s] Error 1 shuffle=3312181336
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1203: prepare0] Error 2 shuffle=3312181336
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:240: __sub-make] Error 2 shuffle=3312181336
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:240: __sub-make] Error 2 shuffle=3312181336
   make: Target 'prepare' not remade because of errors.


vim +/arch_ftrace_get_regs +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