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SubjectRe: [gustavoars:for-next/cast-function 1/3] kernel/trace/ftrace.c:7029:6: error: no previous prototype for function 'arch_ftrace_ops_list_func'
On Thu, 14 Oct 2021 07:33:21 +0800
kernel test robot <lkp@intel.com> wrote:

> tree: https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git for-next/cast-function
> head: eed09ebd6f47aeb92b3fe3b8d338b2a55e534928
> commit: f9d45e65ef7f67bdb39c15d09bc6021f197d893e [1/3] ftrace: Fix -Wcast-function-type warnings on powerpc64
> config: i386-buildonly-randconfig-r002-20211013 (attached as .config)
> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project b6a8c695542b2987eb9a203d5663a0740cb4725f)
> 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/gustavoars/linux.git/commit/?id=f9d45e65ef7f67bdb39c15d09bc6021f197d893e
> git remote add gustavoars https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git
> git fetch --no-tags gustavoars for-next/cast-function
> git checkout f9d45e65ef7f67bdb39c15d09bc6021f197d893e
> # save the attached .config to linux build tree
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=i386
>
> 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:297:5: error: no previous prototype for function '__register_ftrace_function' [-Werror,-Wmissing-prototypes]
> int __register_ftrace_function(struct ftrace_ops *ops)
> ^
> kernel/trace/ftrace.c:297:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
> int __register_ftrace_function(struct ftrace_ops *ops)
> ^
> static
> kernel/trace/ftrace.c:340:5: error: no previous prototype for function '__unregister_ftrace_function' [-Werror,-Wmissing-prototypes]
> int __unregister_ftrace_function(struct ftrace_ops *ops)
> ^
> kernel/trace/ftrace.c:340:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
> int __unregister_ftrace_function(struct ftrace_ops *ops)
> ^
> static
> kernel/trace/ftrace.c:579:5: error: no previous prototype for function 'ftrace_profile_pages_init' [-Werror,-Wmissing-prototypes]
> int ftrace_profile_pages_init(struct ftrace_profile_stat *stat)
> ^
> kernel/trace/ftrace.c:579:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
> int ftrace_profile_pages_init(struct ftrace_profile_stat *stat)
> ^
> static
> kernel/trace/ftrace.c:3871:15: error: no previous prototype for function 'arch_ftrace_match_adjust' [-Werror,-Wmissing-prototypes]
> char * __weak arch_ftrace_match_adjust(char *str, const char *search)
> ^
> kernel/trace/ftrace.c:3871:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
> char * __weak arch_ftrace_match_adjust(char *str, const char *search)
> ^
> static
> >> kernel/trace/ftrace.c:7029:6: error: no previous prototype for function 'arch_ftrace_ops_list_func' [-Werror,-Wmissing-prototypes]
> void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
> ^
> kernel/trace/ftrace.c:7029:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
> void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
> ^
> static
> 5 errors generated.
>
>
> vim +/arch_ftrace_ops_list_func +7029 kernel/trace/ftrace.c
>
> 7011
> 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
> 7020 * being NULL, or CONFIG_DYNAMIC_FTRACE_WITH_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 vmlinux.lds.h, ftrace_ops_list_func() is defined to be
> 7026 * arch_ftrace_ops_list_func.
> 7027 */
> 7028 #if ARCH_SUPPORTS_FTRACE_OPS
> > 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);
> 7041
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

This should fix this issue as well as some of the other ones reported on
this commit.

[ I'll be adding this update to my own version in my tree ]

-- Steve

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index b86f52683b6f..8771c435f34b 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -178,7 +178,8 @@
ftrace_ops_list_func = arch_ftrace_ops_list_func;
#else
# ifdef CONFIG_FUNCTION_TRACER
-# define MCOUNT_REC() ftrace_stub_graph = ftrace_stub;
+# define MCOUNT_REC() ftrace_stub_graph = ftrace_stub; \
+ ftrace_ops_list_func = arch_ftrace_ops_list_func;
# else
# define MCOUNT_REC()
# endif
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 832e65f06754..871b51bec170 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -30,16 +30,25 @@
#define ARCH_SUPPORTS_FTRACE_OPS 0
#endif

+#ifdef CONFIG_FUNCTION_TRACER
+struct ftrace_ops;
/*
* If the arch's mcount caller does not support all of ftrace's
* features, then it must call an indirect function that
* does. Or at least does enough to prevent any unwelcome side effects.
+ *
+ * Also define the function prototype that these architectures use
+ * to call the ftrace_ops_list_func().
*/
#if !ARCH_SUPPORTS_FTRACE_OPS
# define FTRACE_FORCE_LIST_FUNC 1
+void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip);
#else
# define FTRACE_FORCE_LIST_FUNC 0
+void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
+ struct ftrace_ops *op, struct ftrace_regs *fregs);
#endif
+#endif /* CONFIG_FUNCTION_TRACER */

/* Main tracing buffer and events set up */
#ifdef CONFIG_TRACING
@@ -88,8 +97,6 @@ extern int
ftrace_enable_sysctl(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos);

-struct ftrace_ops;
-
#ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS

struct ftrace_regs {
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