linux-kernel - Re: [PATCH] tracing: Add saved_tgids file to show cached pid to tgid mappings

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Date:   Sun, 2 Jul 2017 10:03:30 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Michael Sartain <mikesart@...tmail.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Joel Fernandes <joelaf@...gle.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] tracing: Add saved_tgids file to show cached pid to tgid
 mappings

Hi Michael,

[auto build test WARNING on trace/for-next]
[also build test WARNING on next-20170630]
[cannot apply to tip/perf/core linus/master v4.12-rc7]
[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/Michael-Sartain/tracing-Add-saved_tgids-file-to-show-cached-pid-to-tgid-mappings/20170702-092448
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git for-next
config: i386-randconfig-x072-07010433 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   In file included from include/uapi/linux/stddef.h:1:0,
                    from include/linux/stddef.h:4,
                    from include/uapi/linux/posix_types.h:4,
                    from include/uapi/linux/types.h:13,
                    from include/linux/types.h:5,
                    from include/linux/mm_types_task.h:10,
                    from include/linux/mm_types.h:4,
                    from include/linux/kmemcheck.h:4,
                    from include/linux/ring_buffer.h:4,
                    from kernel/trace/trace.c:14:
   kernel/trace/trace.c: In function 'saved_cmdlines_next':
   kernel/trace/trace.c:4612:22: error: implicit declaration of function 'trace_find_tgid' [-Werror=implicit-function-declaration]
      if (tgid_check && !trace_find_tgid(*ptr))
                         ^
   include/linux/compiler.h:160:30: note: in definition of macro '__trace_if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
                                 ^~~~
>> kernel/trace/trace.c:4612:3: note: in expansion of macro 'if'
      if (tgid_check && !trace_find_tgid(*ptr))
      ^~
   kernel/trace/trace.c: In function 'saved_cmdlines_start':
   kernel/trace/trace.c:4627:21: error: 'tgid_map' undeclared (first use in this function)
     if (tgid_check && !tgid_map)
                        ^
   include/linux/compiler.h:160:30: note: in definition of macro '__trace_if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
                                 ^~~~
   kernel/trace/trace.c:4627:2: note: in expansion of macro 'if'
     if (tgid_check && !tgid_map)
     ^~
   kernel/trace/trace.c:4627:21: note: each undeclared identifier is reported only once for each function it appears in
     if (tgid_check && !tgid_map)
                        ^
   include/linux/compiler.h:160:30: note: in definition of macro '__trace_if'
     if (__builtin_constant_p(!!(cond)) ? !!(cond) :   \
                                 ^~~~
   kernel/trace/trace.c:4627:2: note: in expansion of macro 'if'
     if (tgid_check && !tgid_map)
     ^~
   cc1: some warnings being treated as errors

vim +/if +4612 kernel/trace/trace.c

  4596	};
  4597	
  4598	static void *saved_cmdlines_next(struct seq_file *m, void *v, loff_t *pos)
  4599	{
  4600		unsigned int *ptr = v;
  4601		long tgid_check = (long) m->private;
  4602	
  4603		if (*pos || m->count)
  4604			ptr++;
  4605	
  4606		(*pos)++;
  4607	
  4608		for (; ptr < &savedcmd->map_cmdline_to_pid[savedcmd->cmdline_num];
  4609		     ptr++) {
  4610			if (*ptr == -1 || *ptr == NO_CMDLINE_MAP)
  4611				continue;
> 4612			if (tgid_check && !trace_find_tgid(*ptr))
  4613				continue;
  4614	
  4615			return ptr;
  4616		}
  4617	
  4618		return NULL;
  4619	}
  4620	

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