linux-kernel - drivers/soc/samsung/s3c-pm-debug.c:30:2: warning: function 's3c_pm_dbg' might be a candidate for 'gnu

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Date:   Thu, 8 Apr 2021 17:22:36 +0800
From:   kernel test robot <lkp@...el.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzk@...nel.org>
Subject: drivers/soc/samsung/s3c-pm-debug.c:30:2: warning: function
 's3c_pm_dbg' might be a candidate for 'gnu_printf' format attribute

Hi Arnd,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   454859c552da78b0f587205d308401922b56863e
commit: 17132da70eb766785b9b4677bacce18cc11ea442 ARM: samsung: move pm check code to drivers/soc
date:   8 months ago
config: arm-randconfig-r023-20210408 (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=17132da70eb766785b9b4677bacce18cc11ea442
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 17132da70eb766785b9b4677bacce18cc11ea442
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   drivers/soc/samsung/s3c-pm-debug.c: In function 's3c_pm_dbg':
>> drivers/soc/samsung/s3c-pm-debug.c:30:2: warning: function 's3c_pm_dbg' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]
      30 |  vsnprintf(buff, sizeof(buff), fmt, va);
         |  ^~~~~~~~~


vim +30 drivers/soc/samsung/s3c-pm-debug.c

72551f6cf13e2f arch/arm/plat-samsung/pm-debug.c Tomasz Figa 2014-03-18  23  
72551f6cf13e2f arch/arm/plat-samsung/pm-debug.c Tomasz Figa 2014-03-18  24  void s3c_pm_dbg(const char *fmt, ...)
72551f6cf13e2f arch/arm/plat-samsung/pm-debug.c Tomasz Figa 2014-03-18  25  {
72551f6cf13e2f arch/arm/plat-samsung/pm-debug.c Tomasz Figa 2014-03-18  26  	va_list va;
72551f6cf13e2f arch/arm/plat-samsung/pm-debug.c Tomasz Figa 2014-03-18  27  	char buff[256];
72551f6cf13e2f arch/arm/plat-samsung/pm-debug.c Tomasz Figa 2014-03-18  28  
72551f6cf13e2f arch/arm/plat-samsung/pm-debug.c Tomasz Figa 2014-03-18  29  	va_start(va, fmt);
72551f6cf13e2f arch/arm/plat-samsung/pm-debug.c Tomasz Figa 2014-03-18 @30  	vsnprintf(buff, sizeof(buff), fmt, va);
72551f6cf13e2f arch/arm/plat-samsung/pm-debug.c Tomasz Figa 2014-03-18  31  	va_end(va);
72551f6cf13e2f arch/arm/plat-samsung/pm-debug.c Tomasz Figa 2014-03-18  32  
72551f6cf13e2f arch/arm/plat-samsung/pm-debug.c Tomasz Figa 2014-03-18  33  	printascii(buff);
72551f6cf13e2f arch/arm/plat-samsung/pm-debug.c Tomasz Figa 2014-03-18  34  }
72551f6cf13e2f arch/arm/plat-samsung/pm-debug.c Tomasz Figa 2014-03-18  35  

:::::: The code at line 30 was first introduced by commit
:::::: 72551f6cf13e2f3a1d273b7007b5d7d7fd69c554 ARM: SAMSUNG: Move Samsung PM debug code into separate file

:::::: TO: Tomasz Figa <t.figa@...sung.com>
:::::: CC: Kukjin Kim <kgene.kim@...sung.com>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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