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Subjectarch/nds32/kernel/ftrace.c:29:29: warning: cast between incompatible function types from 'void (*)(long unsigned int, long unsigned int, struct ftrace_ops *, struct ftrace_regs *)' to 'void (*)(struct ftrace_graph_ret *)'
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: a180bd1d7e16173d965b263c5a536aa40afa2a2a
commit: d19ad0775dcd64b49eecf4fa79c17959ebfbd26b ftrace: Have the callbacks receive a struct ftrace_regs instead of pt_regs
date: 8 months ago
config: nds32-randconfig-r016-20210705 (attached as .config)
compiler: nds32le-linux-gcc (GCC) 9.3.0
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/torvalds/linux.git/commit/?id=d19ad0775dcd64b49eecf4fa79c17959ebfbd26b
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout d19ad0775dcd64b49eecf4fa79c17959ebfbd26b
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=nds32

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

All warnings (new ones prefixed by >>):

arch/nds32/kernel/ftrace.c: In function '_mcount':
arch/nds32/kernel/ftrace.c:24:28: warning: comparison of distinct pointer types lacks a cast
24 | if (ftrace_trace_function != ftrace_stub)
| ^~
>> arch/nds32/kernel/ftrace.c:29:29: warning: cast between incompatible function types from 'void (*)(long unsigned int, long unsigned int, struct ftrace_ops *, struct ftrace_regs *)' to 'void (*)(struct ftrace_graph_ret *)' [-Wcast-function-type]
29 | if (ftrace_graph_return != (trace_func_graph_ret_t)ftrace_stub
| ^
arch/nds32/kernel/ftrace.c: At top level:
arch/nds32/kernel/ftrace.c:198:6: warning: no previous prototype for 'prepare_ftrace_return' [-Wmissing-prototypes]
198 | void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
| ^~~~~~~~~~~~~~~~~~~~~
arch/nds32/kernel/ftrace.c:275:15: warning: no previous prototype for '__trace_hardirqs_off' [-Wmissing-prototypes]
275 | noinline void __trace_hardirqs_off(void)
| ^~~~~~~~~~~~~~~~~~~~
arch/nds32/kernel/ftrace.c:279:15: warning: no previous prototype for '__trace_hardirqs_on' [-Wmissing-prototypes]
279 | noinline void __trace_hardirqs_on(void)
| ^~~~~~~~~~~~~~~~~~~


vim +29 arch/nds32/kernel/ftrace.c

a18082575c6648 Zong Li 2018-08-15 17
a18082575c6648 Zong Li 2018-08-15 18 noinline void _mcount(unsigned long parent_ip)
a18082575c6648 Zong Li 2018-08-15 19 {
a18082575c6648 Zong Li 2018-08-15 20 /* save all state by the compiler prologue */
a18082575c6648 Zong Li 2018-08-15 21
a18082575c6648 Zong Li 2018-08-15 22 unsigned long ip = (unsigned long)__builtin_return_address(0);
a18082575c6648 Zong Li 2018-08-15 23
a18082575c6648 Zong Li 2018-08-15 24 if (ftrace_trace_function != ftrace_stub)
a18082575c6648 Zong Li 2018-08-15 25 ftrace_trace_function(ip - MCOUNT_INSN_SIZE, parent_ip,
a18082575c6648 Zong Li 2018-08-15 26 NULL, NULL);
a18082575c6648 Zong Li 2018-08-15 27
1e9b14c0d92b61 Zong Li 2018-08-15 28 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1e9b14c0d92b61 Zong Li 2018-08-15 @29 if (ftrace_graph_return != (trace_func_graph_ret_t)ftrace_stub
1e9b14c0d92b61 Zong Li 2018-08-15 30 || ftrace_graph_entry != ftrace_graph_entry_stub)
1e9b14c0d92b61 Zong Li 2018-08-15 31 ftrace_graph_caller();
1e9b14c0d92b61 Zong Li 2018-08-15 32 #endif
1e9b14c0d92b61 Zong Li 2018-08-15 33
a18082575c6648 Zong Li 2018-08-15 34 /* restore all state by the compiler epilogue */
a18082575c6648 Zong Li 2018-08-15 35 }
a18082575c6648 Zong Li 2018-08-15 36 EXPORT_SYMBOL(_mcount);
1e9b14c0d92b61 Zong Li 2018-08-15 37

:::::: The code at line 29 was first introduced by commit
:::::: 1e9b14c0d92b61a0979fd5ee24d5e7f080f11030 nds32/ftrace: Support static function graph tracer

:::::: TO: Zong Li <zong@andestech.com>
:::::: CC: Greentime Hu <greentime@andestech.com>

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