linux-kernel - Re: [PATCH 1/2] lib: Add module to simulate atomic sections for testing {preempt,irqs}off tracers

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Message-ID: <201805210814.evcJMhzx%fengguang.wu@intel.com>
Date:   Mon, 21 May 2018 08:28:47 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Joel Fernandes <joelaf@...gle.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Peter Zilstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Glexiner <tglx@...utronix.de>,
        Boqun Feng <boqun.feng@...il.com>,
        Paul McKenney <paulmck@...ux.vnet.ibm.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Todd Kjos <tkjos@...gle.com>,
        Erick Reyes <erickreyes@...gle.com>,
        Julia Cartwright <julia@...com>, kernel-team@...roid.com
Subject: Re: [PATCH 1/2] lib: Add module to simulate atomic sections for
 testing {preempt,irqs}off tracers

Hi Joel,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v4.17-rc6 next-20180517]
[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/Joel-Fernandes/Tests-for-preemptoff-and-irqsoff-tracers/20180521-064835
config: sparc64-allyesconfig (attached as .config)
compiler: sparc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=sparc64 

All warnings (new ones prefixed by >>):

   lib/test_atomic_sections.c: In function 'atomic_sect_exit':
>> lib/test_atomic_sections.c:75:9: warning: 'return' with a value, in function returning void
     return 0;
            ^
   lib/test_atomic_sections.c:73:20: note: declared here
    static void __exit atomic_sect_exit(void)
                       ^~~~~~~~~~~~~~~~

vim +/return +75 lib/test_atomic_sections.c

    72	
    73	static void __exit atomic_sect_exit(void)
    74	{
  > 75		return 0;
    76	}
    77	

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