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Date:   Wed, 6 Oct 2021 04:17:28 +0800
From:   kernel test robot <>
To:     Steven Rostedt <>
        0day robot <>
Subject: kernel/trace/ftrace.c:7029:6: warning: no previous prototype for

head:   200d9dd9fd167dae7f84464ff025b6d9bb2bc635
commit: 200d9dd9fd167dae7f84464ff025b6d9bb2bc635 ftrace: Fix -Wcast-function-type warnings on powerpc64
date:   4 hours ago
config: parisc-buildonly-randconfig-r002-20211004 (attached as .config)
compiler: hppa-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git remote add linux-review
        git fetch --no-tags linux-review UPDATE-20211006-003617/Gustavo-A-R-Silva/ftrace-Fix-Wcast-function-type-warnings-on-powerpc64/20211005-133606
        git checkout 200d9dd9fd167dae7f84464ff025b6d9bb2bc635
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=parisc 

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

All warnings (new ones prefixed by >>):

   kernel/trace/ftrace.c:579:5: warning: no previous prototype for 'ftrace_profile_pages_init' [-Wmissing-prototypes]
     579 | int ftrace_profile_pages_init(struct ftrace_profile_stat *stat)
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~
>> kernel/trace/ftrace.c:7029:6: warning: no previous prototype for 'arch_ftrace_ops_list_func' [-Wmissing-prototypes]
    7029 | void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~

vim +/arch_ftrace_ops_list_func +7029 kernel/trace/ftrace.c

  7012	/*
  7013	 * Some archs only support passing ip and parent_ip. Even though
  7014	 * the list function ignores the op parameter, we do not want any
  7015	 * C side effects, where a function is called without the caller
  7016	 * sending a third parameter.
  7017	 * Archs are to support both the regs and ftrace_ops at the same time.
  7018	 * If they support ftrace_ops, it is assumed they support regs.
  7019	 * If call backs want to use regs, they must either check for regs
  7021	 * Note, CONFIG_DYNAMIC_FTRACE_WITH_REGS expects a full regs to be saved.
  7022	 * An architecture can pass partial regs with ftrace_ops and still
  7023	 * set the ARCH_SUPPORTS_FTRACE_OPS.
  7024	 *
  7025	 * In, ftrace_ops_list_func() is defined to be
  7026	 * arch_ftrace_ops_list_func.
  7027	 */
> 7029	void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
  7030				       struct ftrace_ops *op, struct ftrace_regs *fregs)
  7031	{
  7032		__ftrace_ops_list_func(ip, parent_ip, NULL, fregs);
  7033	}
  7034	#else
  7035	void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip)
  7036	{
  7037		__ftrace_ops_list_func(ip, parent_ip, NULL, NULL);
  7038	}
  7039	#endif
  7040	NOKPROBE_SYMBOL(arch_ftrace_ops_list_func);

0-DAY CI Kernel Test Service, Intel Corporation

Download attachment ".config.gz" of type "application/gzip" (30064 bytes)

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