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Subjectdrivers/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: f40ddce88593482919761f74910f42f4b84c004b
commit: 17132da70eb766785b9b4677bacce18cc11ea442 ARM: samsung: move pm check code to drivers/soc
date: 6 months ago
config: arm-randconfig-m031-20210221 (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@intel.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@samsung.com>
:::::: CC: Kukjin Kim <kgene.kim@samsung.com>

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