linux-kernel - Re: [PATCH v2 1/3] tracing: kprobes: Prohibit probing on notrace function

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Date:   Sat, 28 Jul 2018 16:11:34 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     kbuild-all@...org, rostedt@...dmis.org,
        Francis Deslauriers <francis.deslauriers@...icios.com>,
        peterz@...radead.org, mhiramat@...nel.org,
        mathieu.desnoyers@...icios.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] tracing: kprobes: Prohibit probing on notrace
 function

Hi Masami,

I love your patch! Yet something to improve:

[auto build test ERROR on tip/perf/core]
[also build test ERROR on v4.18-rc6 next-20180727]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Masami-Hiramatsu/tracing-kprobes-Prohibit-probing-on-notrace-functions/20180728-145919
config: x86_64-randconfig-x018-201829 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   kernel//trace/trace_kprobe.c: In function 'within_notrace_func':
>> kernel//trace/trace_kprobe.c:503:10: error: implicit declaration of function 'ftrace_location_range'; did you mean 'ftrace_location'? [-Werror=implicit-function-declaration]
     return !ftrace_location_range(addr - offset, addr - offset + size);
             ^~~~~~~~~~~~~~~~~~~~~
             ftrace_location
   cc1: some warnings being treated as errors

vim +503 kernel//trace/trace_kprobe.c

   489	
   490	#ifdef CONFIG_KPROBE_EVENTS_ON_NOTRACE
   491	#define within_notrace_func(tk)	(false)
   492	#else
   493	static bool within_notrace_func(struct trace_kprobe *tk)
   494	{
   495		unsigned long offset, size, addr;
   496	
   497		addr = kallsyms_lookup_name(trace_kprobe_symbol(tk));
   498		addr += trace_kprobe_offset(tk);
   499	
   500		if (!kallsyms_lookup_size_offset(addr, &size, &offset))
   501			return true;	/* Out of range. */
   502	
 > 503		return !ftrace_location_range(addr - offset, addr - offset + size);
   504	}
   505	#endif
   506	

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