linux-kernel - Re: [PATCH v6 2/4] tracing: Add hist trigger support for generic fields

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Date:   Wed, 7 Sep 2016 21:39:14 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Binoy Jayan <binoy.jayan@...aro.org>
Cc:     kbuild-all@...org,
        "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Daniel Wagner <daniel.wagner@...-carit.de>,
        Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
        Masami <masami.hiramatsu@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v6 2/4] tracing: Add hist trigger support for generic
 fields

Hi Daniel,

[auto build test WARNING on tip/perf/core]
[also build test WARNING on v4.8-rc5 next-20160907]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
[Suggest to use git(>=2.9.0) format-patch --base=<commit> (or --base=auto for convenience) to record what (public, well-known) commit your patch series was built on]
[Check https://git-scm.com/docs/git-format-patch for more information]

url:    https://github.com/0day-ci/linux/commits/Binoy-Jayan/tracing-Deference-pointers-without-RCU-checks/20160907-205003
config: i386-randconfig-x003-201636 (attached as .config)
compiler: gcc-6 (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   kernel/trace/trace_events_hist.c: In function 'hist_field_comm':
>> kernel/trace/trace_events_hist.c:85:9: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
     return (u64) current->comm;
            ^

vim +85 kernel/trace/trace_events_hist.c

    69	}
    70	
    71	static u64 hist_field_log2(struct hist_field *hist_field, void *event)
    72	{
    73		u64 val = *(u64 *)(event + hist_field->field->offset);
    74	
    75		return (u64) ilog2(roundup_pow_of_two(val));
    76	}
    77	
    78	static u64 hist_field_cpu(struct hist_field *hist_field, void *event)
    79	{
    80		return (u64) smp_processor_id();
    81	}
    82	
    83	static u64 hist_field_comm(struct hist_field *hist_field, void *event)
    84	{
  > 85		return (u64) current->comm;
    86	}
    87	
    88	#define DEFINE_HIST_FIELD_FN(type)					\
    89	static u64 hist_field_##type(struct hist_field *hist_field, void *event)\
    90	{									\
    91		type *addr = (type *)(event + hist_field->field->offset);	\
    92										\
    93		return (u64)(unsigned long)*addr;				\

---
0-DAY kernel test infrastructure                Open Source Technology Center
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