linux-kernel - Re: [PATCH] powerpc/fadump: return error when fadump registration fails

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Message-ID: <201705251543.gd6iZ3OM%fengguang.wu@intel.com>
Date:   Thu, 25 May 2017 15:16:44 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Michal Suchanek <msuchanek@...e.de>
Cc:     kbuild-all@...org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
        Hari Bathini <hbathini@...ux.vnet.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Suchanek <msuchanek@...e.de>,
        Daniel Axtens <dja@...ens.net>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/fadump: return error when fadump registration
 fails

Hi Michal,

[auto build test WARNING on powerpc/next]
[also build test WARNING on v4.12-rc2 next-20170525]
[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/Michal-Suchanek/powerpc-fadump-return-error-when-fadump-registration-fails/20170525-083625
base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
config: powerpc-allmodconfig (attached as .config)
compiler: powerpc64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/01org/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=powerpc 

All warnings (new ones prefixed by >>):

   arch/powerpc/kernel/fadump.c: In function 'register_fadump':
>> arch/powerpc/kernel/fadump.c:978:3: warning: 'return' with no value, in function returning non-void [-Wreturn-type]
      return;
      ^~~~~~
   arch/powerpc/kernel/fadump.c:968:12: note: declared here
    static int register_fadump(void)
               ^~~~~~~~~~~~~~~

vim +/return +978 arch/powerpc/kernel/fadump.c

ebaeb5ae Mahesh Salgaonkar 2012-02-16  962  	/* We will set the crashing cpu id in crash_fadump() during crash. */
ebaeb5ae Mahesh Salgaonkar 2012-02-16  963  	fdh->crashing_cpu = CPU_UNKNOWN;
2df173d9 Mahesh Salgaonkar 2012-02-16  964  
2df173d9 Mahesh Salgaonkar 2012-02-16  965  	return addr;
2df173d9 Mahesh Salgaonkar 2012-02-16  966  }
2df173d9 Mahesh Salgaonkar 2012-02-16  967  
c87372ca Michal Suchanek   2017-05-24  968  static int register_fadump(void)
3ccc00a7 Mahesh Salgaonkar 2012-02-20  969  {
2df173d9 Mahesh Salgaonkar 2012-02-16  970  	unsigned long addr;
2df173d9 Mahesh Salgaonkar 2012-02-16  971  	void *vaddr;
2df173d9 Mahesh Salgaonkar 2012-02-16  972  
3ccc00a7 Mahesh Salgaonkar 2012-02-20  973  	/*
3ccc00a7 Mahesh Salgaonkar 2012-02-20  974  	 * If no memory is reserved then we can not register for firmware-
3ccc00a7 Mahesh Salgaonkar 2012-02-20  975  	 * assisted dump.
3ccc00a7 Mahesh Salgaonkar 2012-02-20  976  	 */
3ccc00a7 Mahesh Salgaonkar 2012-02-20  977  	if (!fw_dump.reserve_dump_area_size)
3ccc00a7 Mahesh Salgaonkar 2012-02-20 @978  		return;
3ccc00a7 Mahesh Salgaonkar 2012-02-20  979  
2df173d9 Mahesh Salgaonkar 2012-02-16  980  	fadump_setup_crash_memory_ranges();
2df173d9 Mahesh Salgaonkar 2012-02-16  981  
408cddd9 Hari Bathini      2014-10-01  982  	addr = be64_to_cpu(fdm.rmr_region.destination_address) + be64_to_cpu(fdm.rmr_region.source_len);
2df173d9 Mahesh Salgaonkar 2012-02-16  983  	/* Initialize fadump crash info header. */
2df173d9 Mahesh Salgaonkar 2012-02-16  984  	addr = init_fadump_header(addr);
2df173d9 Mahesh Salgaonkar 2012-02-16  985  	vaddr = __va(addr);
2df173d9 Mahesh Salgaonkar 2012-02-16  986  

:::::: The code at line 978 was first introduced by commit
:::::: 3ccc00a7e04ff7718c9aebb4b0c982571c798759 fadump: Register for firmware assisted dump.

:::::: TO: Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>
:::::: CC: Benjamin Herrenschmidt <benh@...nel.crashing.org>

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