Re: [PATCH][next] ftrace: Fix -Wcast-function-type warnings on powerpc64

[kernel test robot <lkp@intel.com>]

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Hi "Gustavo,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/perf/core]
[also build test ERROR on linux/master v5.15]
[cannot apply to rostedt-trace/for-next linus/master next-20211105]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Gustavo-A-R-Silva/ftrace-Fix-Wcast-function-type-warnings-on-powerpc64/20211005-133606
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 41100833cdd8b1bef363b81a6482d74711c116ad
config: arm-randconfig-r012-20211004 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c0039de2953d15815448b4b3c3bafb45607781e0)
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
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/0day-ci/linux/commit/9c10c0713155955bf1170eea3904cfcfb6d2d832
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Gustavo-A-R-Silva/ftrace-Fix-Wcast-function-type-warnings-on-powerpc64/20211005-133606
        git checkout 9c10c0713155955bf1170eea3904cfcfb6d2d832
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm 

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

All errors (new ones prefixed by >>):

>> kernel/trace/ftrace.c:6925:12: error: incompatible function pointer types initializing 'ftrace_func_t' (aka 'void (*)(unsigned long, unsigned long)') with an expression of type 'void (unsigned long, unsigned long, struct ftrace_ops *, struct ftrace_regs *)' [-Werror,-Wincompatible-function-pointer-types]
           .func                   = ftrace_stub,
                                     ^~~~~~~~~~~
   1 error generated.
--
>> kernel/trace/trace_irqsoff.c:567:28: error: incompatible function pointer types passing 'void (unsigned long, unsigned long, struct ftrace_ops *, struct ftrace_regs *)' to parameter of type 'ftrace_func_t' (aka 'void (*)(unsigned long, unsigned long)') [-Werror,-Wincompatible-function-pointer-types]
           ftrace_init_array_ops(tr, irqsoff_tracer_call);
                                     ^~~~~~~~~~~~~~~~~~~
   kernel/trace/trace.h:981:66: note: passing argument to parameter 'func' here
   void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
                                                                    ^
   1 error generated.


vim +6925 kernel/trace/ftrace.c

0b6e4d56bf7186 Frederic Weisbecker      2008-10-28  6923  
3306fc4aff464f Steven Rostedt (VMware   2018-11-15  6924) struct ftrace_ops global_ops = {
bd69c30b1d0803 Steven Rostedt           2011-05-03 @6925  	.func			= ftrace_stub,
a25d036d939a30 Steven Rostedt (VMware   2020-11-05  6926) 	.flags			= FTRACE_OPS_FL_INITIALIZED |
e3eea1404f5ff7 Steven Rostedt (Red Hat  2015-07-24  6927) 				  FTRACE_OPS_FL_PID,
bd69c30b1d0803 Steven Rostedt           2011-05-03  6928  };
bd69c30b1d0803 Steven Rostedt           2011-05-03  6929  

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

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