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Date: Thu, 18 Jun 2020 18:06:40 +0800
From: kernel test robot <lkp@...el.com>
To: Steven Rostedt <rostedt@...dmis.org>,
LKML <linux-kernel@...r.kernel.org>
Cc: kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
Ingo Molnar <mingo@...nel.org>, Kees Cook <keescook@...omium.org>,
kernel-hardening@...ts.openwall.com,
Oscar Carter <oscar.carter@....com>,
Andrew Morton <akpm@...ux-foundation.org>,
Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [PATCH] tracing: Use linker magic instead of recasting
ftrace_ops_list_func()
Hi Steven,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on linux/master]
[also build test WARNING on tip/perf/core linus/master v5.8-rc1 next-20200618]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use as documented in
https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/Steven-Rostedt/tracing-Use-linker-magic-instead-of-recasting-ftrace_ops_list_func/20200618-045733
base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git a5dc8300df75e8b8384b4c82225f1e4a0b4d9b55
config: x86_64-randconfig-a015-20200618 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 487ca07fcc75d52755c9fe2ee05bcb3b6eeeec44)
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 x86_64 cross compiling tool for clang build
# apt-get install binutils-x86-64-linux-gnu
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
All warnings (new ones prefixed by >>, old ones prefixed by <<):
kernel/trace/ftrace.c:300:5: warning: no previous prototype for function '__register_ftrace_function' [-Wmissing-prototypes]
int __register_ftrace_function(struct ftrace_ops *ops)
^
kernel/trace/ftrace.c:300:1: 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:343:5: warning: no previous prototype for function '__unregister_ftrace_function' [-Wmissing-prototypes]
int __unregister_ftrace_function(struct ftrace_ops *ops)
^
kernel/trace/ftrace.c:343:1: 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:582:5: warning: no previous prototype for function 'ftrace_profile_pages_init' [-Wmissing-prototypes]
int ftrace_profile_pages_init(struct ftrace_profile_stat *stat)
^
kernel/trace/ftrace.c:582:1: 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:3796:15: warning: no previous prototype for function 'arch_ftrace_match_adjust' [-Wmissing-prototypes]
char * __weak arch_ftrace_match_adjust(char *str, const char *search)
^
kernel/trace/ftrace.c:3796:1: 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:6854:6: warning: no previous prototype for function 'arch_ftrace_ops_list_func' [-Wmissing-prototypes]
void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
^
kernel/trace/ftrace.c:6854:1: 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 warnings generated.
vim +/arch_ftrace_ops_list_func +6854 kernel/trace/ftrace.c
6836
6837 /*
6838 * Some archs only support passing ip and parent_ip. Even though
6839 * the list function ignores the op parameter, we do not want any
6840 * C side effects, where a function is called without the caller
6841 * sending a third parameter.
6842 * Archs are to support both the regs and ftrace_ops at the same time.
6843 * If they support ftrace_ops, it is assumed they support regs.
6844 * If call backs want to use regs, they must either check for regs
6845 * being NULL, or CONFIG_DYNAMIC_FTRACE_WITH_REGS.
6846 * Note, CONFIG_DYNAMIC_FTRACE_WITH_REGS expects a full regs to be saved.
6847 * An architecture can pass partial regs with ftrace_ops and still
6848 * set the ARCH_SUPPORTS_FTRACE_OPS.
6849 *
6850 * In vmlinux.lds.h, ftrace_ops_list_func() is defined to be
6851 * arch_ftrace_ops_list_func.
6852 */
6853 #if ARCH_SUPPORTS_FTRACE_OPS
> 6854 void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
6855 struct ftrace_ops *op, struct pt_regs *regs)
6856 {
6857 __ftrace_ops_list_func(ip, parent_ip, NULL, regs);
6858 }
6859 #else
6860 void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip)
6861 {
6862 __ftrace_ops_list_func(ip, parent_ip, NULL, NULL);
6863 }
6864 #endif
6865 NOKPROBE_SYMBOL(arch_ftrace_ops_list_func);
6866
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
Download attachment ".config.gz" of type "application/gzip" (31280 bytes)
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