[mark:arm64/ftrace/minimal-regs 6/6] include/linux/ftrace.h:126:16: error: implicit declaration of function 'arch_ftrace_get_regs'; did you mean 'ftrace_get_regs'?

From: kernel test robot
Date: Wed Jun 01 2022 - 14:34:23 EST


tree: https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git arm64/ftrace/minimal-regs
head: b0741d059a9f19a1aa1191833140f53e41f1775a
commit: b0741d059a9f19a1aa1191833140f53e41f1775a [6/6] WIP: arm64/ftrace: move from REGS to ARGS
config: arm64-randconfig-r031-20220601 (https://download.01.org/0day-ci/archive/20220602/202206020253.PecbI4Mb-lkp@xxxxxxxxx/config)
compiler: aarch64-linux-gcc (GCC) 11.3.0
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://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git/commit/?id=b0741d059a9f19a1aa1191833140f53e41f1775a
git remote add mark https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git
git fetch --no-tags mark arm64/ftrace/minimal-regs
git checkout b0741d059a9f19a1aa1191833140f53e41f1775a
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=arm64 prepare

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All error/warnings (new ones prefixed by >>):

In file included from include/linux/kvm_host.h:32,
from arch/arm64/kernel/asm-offsets.c:15:
include/linux/ftrace.h: In function 'ftrace_get_regs':
>> include/linux/ftrace.h:126:16: error: implicit declaration of function 'arch_ftrace_get_regs'; did you mean 'ftrace_get_regs'? [-Werror=implicit-function-declaration]
126 | return arch_ftrace_get_regs(fregs);
| ^~~~~~~~~~~~~~~~~~~~
| ftrace_get_regs
>> include/linux/ftrace.h:126:16: warning: returning 'int' from a function with return type 'struct pt_regs *' makes pointer from integer without a cast [-Wint-conversion]
126 | return arch_ftrace_get_regs(fregs);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
make[2]: *** [scripts/Makefile.build:121: arch/arm64/kernel/asm-offsets.s] Error 1
make[2]: Target '__build' not remade because of errors.
make[1]: *** [Makefile:1196: prepare0] Error 2
make[1]: Target 'prepare' not remade because of errors.
make: *** [Makefile:219: __sub-make] Error 2
make: Target 'prepare' not remade because of errors.


vim +126 include/linux/ftrace.h

d19ad0775dcd64 Steven Rostedt (VMware 2020-10-28 120)
d19ad0775dcd64 Steven Rostedt (VMware 2020-10-28 121) static __always_inline struct pt_regs *ftrace_get_regs(struct ftrace_regs *fregs)
d19ad0775dcd64 Steven Rostedt (VMware 2020-10-28 122) {
d19ad0775dcd64 Steven Rostedt (VMware 2020-10-28 123) if (!fregs)
d19ad0775dcd64 Steven Rostedt (VMware 2020-10-28 124) return NULL;
d19ad0775dcd64 Steven Rostedt (VMware 2020-10-28 125)
02a474ca266a47 Steven Rostedt (VMware 2020-10-27 @126) return arch_ftrace_get_regs(fregs);
d19ad0775dcd64 Steven Rostedt (VMware 2020-10-28 127) }
d19ad0775dcd64 Steven Rostedt (VMware 2020-10-28 128)

:::::: The code at line 126 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@xxxxxxxxxxx>
:::::: CC: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>

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