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Date:   Tue, 19 May 2020 10:12:11 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Rajan Shanmugavelu <rajan.shanmugavelu@...cle.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Joe Jin <joe.jin@...cle.com>
Subject: arch/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@...el.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@...ibm.com>
:::::: CC: Martin Schwidefsky <schwidefsky@...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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