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Subjectarch/s390/include/asm/lowcore.h:191:33: warning: function 'perf_trace_qla_log_event' might be a candidate for 'gnu_printf' format attribute
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 642b151f45dd54809ea00ecd3976a56c1ec9b53d
commit: 598a90f2002c4c4daee24d76d24e8270c7075eef scsi: qla2xxx: add ring buffer for tracing debug logs
date: 10 weeks ago
config: s390-allyesconfig (attached as .config)
compiler: s390-linux-gcc (GCC) 9.3.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
git checkout 598a90f2002c4c4daee24d76d24e8270c7075eef
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=s390

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

All warnings (new ones prefixed by >>, old ones prefixed by <<):

In file included from include/trace/define_trace.h:102,
from include/trace/events/qla.h:39,
from drivers/scsi/qla2xxx/qla_dbg.c:77:
include/trace/events/qla.h: In function 'trace_event_raw_event_qla_log_event':
include/trace/trace_events.h:691:9: warning: function 'trace_event_raw_event_qla_log_event' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]
691 | struct trace_event_raw_##call *entry; | ^~~~~~~~~~~~~~~~
include/trace/events/qla.h:12:1: note: in expansion of macro 'DECLARE_EVENT_CLASS'
12 | DECLARE_EVENT_CLASS(qla_log_event,
| ^~~~~~~~~~~~~~~~~~~
In file included from include/linux/compiler_types.h:68,
from <command-line>:
include/trace/events/qla.h: In function 'perf_trace_qla_log_event':
>> arch/s390/include/asm/lowcore.h:191:33: warning: function 'perf_trace_qla_log_event' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]
191 | #define S390_lowcore (*((struct lowcore *) 0))
| ^~~~~~~
include/linux/compiler-gcc.h:58:26: note: in definition of macro 'RELOC_HIDE'
58 | (typeof(ptr)) (__ptr + (off)); | ^~~
>> include/asm-generic/percpu.h:44:31: note: in expansion of macro 'SHIFT_PERCPU_PTR'
44 | #define arch_raw_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, __my_cpu_offset)
| ^~~~~~~~~~~~~~~~
>> arch/s390/include/asm/percpu.h:12:25: note: in expansion of macro 'S390_lowcore'
12 | #define __my_cpu_offset S390_lowcore.percpu_offset
| ^~~~~~~~~~~~
>> include/asm-generic/percpu.h:44:53: note: in expansion of macro '__my_cpu_offset'
44 | #define arch_raw_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, __my_cpu_offset)
| ^~~~~~~~~~~~~~~
>> include/linux/percpu-defs.h:242:2: note: in expansion of macro 'arch_raw_cpu_ptr'
242 | arch_raw_cpu_ptr(ptr); | ^~~~~~~~~~~~~~~~
include/linux/percpu-defs.h:252:27: note: in expansion of macro 'raw_cpu_ptr'
252 | #define this_cpu_ptr(ptr) raw_cpu_ptr(ptr)
| ^~~~~~~~~~~
>> include/trace/perf.h:48:9: note: in expansion of macro 'this_cpu_ptr'
48 | head = this_cpu_ptr(event_call->perf_events); | ^~~~~~~~~~~~
include/trace/events/qla.h:12:1: note: in expansion of macro 'DECLARE_EVENT_CLASS'
12 | DECLARE_EVENT_CLASS(qla_log_event,
| ^~~~~~~~~~~~~~~~~~~

vim +191 arch/s390/include/asm/lowcore.h

cbb870c8221147 Heiko Carstens 2010-02-26 190
c667aeacc16e0d Heiko Carstens 2015-12-31 @191 #define S390_lowcore (*((struct lowcore *) 0))
cbb870c8221147 Heiko Carstens 2010-02-26 192

:::::: The code at line 191 was first introduced by commit
:::::: c667aeacc16e0de9e205faa93f57121d6f691973 s390: rename struct _lowcore to struct lowcore

:::::: TO: Heiko Carstens <heiko.carstens@de.ibm.com>
:::::: CC: Martin Schwidefsky <schwidefsky@de.ibm.com>

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