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Re: [PATCH 04/13] tracing/brcm: Use the new __vstring() helper

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On 7/6/2022 4:50 AM, Steven Rostedt wrote:
On Wed, 6 Jul 2022 10:35:50 +0800
kernel test robot <lkp@xxxxxxxxx> wrote:

Hi Steven,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on rostedt-trace/for-next]
[also build test WARNING on wireless-next/main wireless/main linus/master v5.19-rc5 next-20220705]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]



If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

OK, let's look at all the warnings.


    In file included from include/trace/define_trace.h:102,
                     from drivers/net/wireless/broadcom/brcm80211/brcmfmac/tracepoint.h:133,
                     from drivers/net/wireless/broadcom/brcm80211/brcmfmac/tracepoint.c:12:
    drivers/net/wireless/broadcom/brcm80211/brcmfmac/./tracepoint.h: In function 'trace_event_get_offsets_brcmf_err':
include/trace/trace_events.h:261:16: warning: function 'trace_event_get_offsets_brcmf_err' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]

  1. "might be a candidate for 'gnu_printf' format attribute"

      261 |         struct trace_event_raw_##call __maybe_unused *entry;            \
          |                ^~~~~~~~~~~~~~~~
    include/trace/trace_events.h:40:9: note: in expansion of macro 'DECLARE_EVENT_CLASS'
       40 |         DECLARE_EVENT_CLASS(name,                              \
          |         ^~~~~~~~~~~~~~~~~~~
    drivers/net/wireless/broadcom/brcm80211/brcmfmac/./tracepoint.h:31:1: note: in expansion of macro 'TRACE_EVENT'
       31 | TRACE_EVENT(brcmf_err,
          | ^~~~~~~~~~~
    drivers/net/wireless/broadcom/brcm80211/brcmfmac/./tracepoint.h: In function 'trace_event_get_offsets_brcmf_dbg':
include/trace/trace_events.h:261:16: warning: function 'trace_event_get_offsets_brcmf_dbg' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]

  2. "might be a candidate for 'gnu_printf' format attribute"

      261 |         struct trace_event_raw_##call __maybe_unused *entry;            \
          |                ^~~~~~~~~~~~~~~~
    include/trace/trace_events.h:40:9: note: in expansion of macro 'DECLARE_EVENT_CLASS'
       40 |         DECLARE_EVENT_CLASS(name,                              \
          |         ^~~~~~~~~~~~~~~~~~~
    drivers/net/wireless/broadcom/brcm80211/brcmfmac/./tracepoint.h:45:1: note: in expansion of macro 'TRACE_EVENT'
       45 | TRACE_EVENT(brcmf_dbg,
          | ^~~~~~~~~~~
    In file included from include/trace/define_trace.h:102,
                     from drivers/net/wireless/broadcom/brcm80211/brcmfmac/tracepoint.h:133,
                     from drivers/net/wireless/broadcom/brcm80211/brcmfmac/tracepoint.c:12:
    drivers/net/wireless/broadcom/brcm80211/brcmfmac/./tracepoint.h: In function 'trace_event_raw_event_brcmf_err':
    include/trace/trace_events.h:386:16: warning: function 'trace_event_raw_event_brcmf_err' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]

  3. "might be a candidate for 'gnu_printf' format attribute"

      386 |         struct trace_event_raw_##call *entry;                           \
          |                ^~~~~~~~~~~~~~~~
    include/trace/trace_events.h:40:9: note: in expansion of macro 'DECLARE_EVENT_CLASS'
       40 |         DECLARE_EVENT_CLASS(name,                              \
          |         ^~~~~~~~~~~~~~~~~~~
    drivers/net/wireless/broadcom/brcm80211/brcmfmac/./tracepoint.h:31:1: note: in expansion of macro 'TRACE_EVENT'
       31 | TRACE_EVENT(brcmf_err,
          | ^~~~~~~~~~~
    drivers/net/wireless/broadcom/brcm80211/brcmfmac/./tracepoint.h: In function 'trace_event_raw_event_brcmf_dbg':
    include/trace/trace_events.h:386:16: warning: function 'trace_event_raw_event_brcmf_dbg' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]

  4. "might be a candidate for 'gnu_printf' format attribute"

      386 |         struct trace_event_raw_##call *entry;                           \
          |                ^~~~~~~~~~~~~~~~
    include/trace/trace_events.h:40:9: note: in expansion of macro 'DECLARE_EVENT_CLASS'
       40 |         DECLARE_EVENT_CLASS(name,                              \
          |         ^~~~~~~~~~~~~~~~~~~
    drivers/net/wireless/broadcom/brcm80211/brcmfmac/./tracepoint.h:45:1: note: in expansion of macro 'TRACE_EVENT'
       45 | TRACE_EVENT(brcmf_dbg,
          | ^~~~~~~~~~~
    In file included from include/trace/define_trace.h:103,
                     from drivers/net/wireless/broadcom/brcm80211/brcmfmac/tracepoint.h:133,
                     from drivers/net/wireless/broadcom/brcm80211/brcmfmac/tracepoint.c:12:
    drivers/net/wireless/broadcom/brcm80211/brcmfmac/./tracepoint.h: In function 'perf_trace_brcmf_err':
    include/trace/perf.h:64:16: warning: function 'perf_trace_brcmf_err' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]

  5. "might be a candidate for 'gnu_printf' format attribute"

       64 |         struct hlist_head *head;                                        \
          |                ^~~~~~~~~~
    include/trace/trace_events.h:40:9: note: in expansion of macro 'DECLARE_EVENT_CLASS'
       40 |         DECLARE_EVENT_CLASS(name,                              \
          |         ^~~~~~~~~~~~~~~~~~~
    drivers/net/wireless/broadcom/brcm80211/brcmfmac/./tracepoint.h:31:1: note: in expansion of macro 'TRACE_EVENT'
       31 | TRACE_EVENT(brcmf_err,
          | ^~~~~~~~~~~
    drivers/net/wireless/broadcom/brcm80211/brcmfmac/./tracepoint.h: In function 'perf_trace_brcmf_dbg':
    include/trace/perf.h:64:16: warning: function 'perf_trace_brcmf_dbg' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]

  6. "might be a candidate for 'gnu_printf' format attribute"

       64 |         struct hlist_head *head;                                        \
          |                ^~~~~~~~~~
    include/trace/trace_events.h:40:9: note: in expansion of macro 'DECLARE_EVENT_CLASS'
       40 |         DECLARE_EVENT_CLASS(name,                              \
          |         ^~~~~~~~~~~~~~~~~~~
    drivers/net/wireless/broadcom/brcm80211/brcmfmac/./tracepoint.h:45:1: note: in expansion of macro 'TRACE_EVENT'
       45 | TRACE_EVENT(brcmf_dbg,
          | ^~~~~~~~~~~
--
    In file included from include/trace/define_trace.h:102,
                     from drivers/net/wireless/broadcom/brcm80211/brcmsmac/brcms_trace_brcmsmac_msg.h:82,
                     from drivers/net/wireless/broadcom/brcm80211/brcmsmac/brcms_trace_events.h:38,
                     from drivers/net/wireless/broadcom/brcm80211/brcmsmac/brcms_trace_events.c:22:
    drivers/net/wireless/broadcom/brcm80211/brcmsmac/./brcms_trace_brcmsmac_msg.h: In function 'trace_event_get_offsets_brcms_dbg':
include/trace/trace_events.h:261:16: warning: function 'trace_event_get_offsets_brcms_dbg' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]

  7. "might be a candidate for 'gnu_printf' format attribute"

      261 |         struct trace_event_raw_##call __maybe_unused *entry;            \
          |                ^~~~~~~~~~~~~~~~
    include/trace/trace_events.h:40:9: note: in expansion of macro 'DECLARE_EVENT_CLASS'
       40 |         DECLARE_EVENT_CLASS(name,                              \
          |         ^~~~~~~~~~~~~~~~~~~
    drivers/net/wireless/broadcom/brcm80211/brcmsmac/./brcms_trace_brcmsmac_msg.h:59:1: note: in expansion of macro 'TRACE_EVENT'
       59 | TRACE_EVENT(brcms_dbg,
          | ^~~~~~~~~~~
    In file included from include/trace/define_trace.h:102,
                     from drivers/net/wireless/broadcom/brcm80211/brcmsmac/brcms_trace_brcmsmac_msg.h:82,
                     from drivers/net/wireless/broadcom/brcm80211/brcmsmac/brcms_trace_events.h:38,
                     from drivers/net/wireless/broadcom/brcm80211/brcmsmac/brcms_trace_events.c:22:
    drivers/net/wireless/broadcom/brcm80211/brcmsmac/./brcms_trace_brcmsmac_msg.h: In function 'trace_event_raw_event_brcms_dbg':
    include/trace/trace_events.h:386:16: warning: function 'trace_event_raw_event_brcms_dbg' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]

  8. "might be a candidate for 'gnu_printf' format attribute"


      386 |         struct trace_event_raw_##call *entry;                           \
          |                ^~~~~~~~~~~~~~~~
    include/trace/trace_events.h:40:9: note: in expansion of macro 'DECLARE_EVENT_CLASS'
       40 |         DECLARE_EVENT_CLASS(name,                              \
          |         ^~~~~~~~~~~~~~~~~~~
    drivers/net/wireless/broadcom/brcm80211/brcmsmac/./brcms_trace_brcmsmac_msg.h:59:1: note: in expansion of macro 'TRACE_EVENT'
       59 | TRACE_EVENT(brcms_dbg,
          | ^~~~~~~~~~~
    In file included from include/trace/define_trace.h:103,
                     from drivers/net/wireless/broadcom/brcm80211/brcmsmac/brcms_trace_brcmsmac_msg.h:82,
                     from drivers/net/wireless/broadcom/brcm80211/brcmsmac/brcms_trace_events.h:38,
                     from drivers/net/wireless/broadcom/brcm80211/brcmsmac/brcms_trace_events.c:22:
    drivers/net/wireless/broadcom/brcm80211/brcmsmac/./brcms_trace_brcmsmac_msg.h: In function 'perf_trace_brcms_dbg':
    include/trace/perf.h:64:16: warning: function 'perf_trace_brcms_dbg' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]

  9. "might be a candidate for 'gnu_printf' format attribute"

       64 |         struct hlist_head *head;                                        \
          |                ^~~~~~~~~~
    include/trace/trace_events.h:40:9: note: in expansion of macro 'DECLARE_EVENT_CLASS'
       40 |         DECLARE_EVENT_CLASS(name,                              \
          |         ^~~~~~~~~~~~~~~~~~~
    drivers/net/wireless/broadcom/brcm80211/brcmsmac/./brcms_trace_brcmsmac_msg.h:59:1: note: in expansion of macro 'TRACE_EVENT'
       59 | TRACE_EVENT(brcms_dbg,
          | ^~~~~~~~~~~


vim +261 include/trace/trace_events.h

55de2c0b5610cb include/trace/trace_events.h Masami Hiramatsu         2021-11-22  253
091ad3658e3c76 include/trace/ftrace.h       Ingo Molnar              2009-11-26  254  #undef DECLARE_EVENT_CLASS
091ad3658e3c76 include/trace/ftrace.h       Ingo Molnar              2009-11-26  255  #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
d0ee8f4a1f5f3d include/trace/trace_events.h Steven Rostedt (Red Hat  2015-05-13  256) static inline notrace int trace_event_get_offsets_##call(		\
62323a148fbeb0 include/trace/trace_events.h Steven Rostedt (Red Hat  2015-05-13  257) 	struct trace_event_data_offsets_##call *__data_offsets, proto)	\
7fcb7c472f455d include/trace/ftrace.h       Li Zefan                 2009-06-01  258  {									\
7fcb7c472f455d include/trace/ftrace.h       Li Zefan                 2009-06-01  259  	int __data_size = 0;						\
114e7b52dee69c include/trace/ftrace.h       Filipe Brandenburger     2014-02-28  260  	int __maybe_unused __item_length;				\
a7237765730a10 include/trace/trace_events.h Steven Rostedt (Red Hat  2015-05-13 @261) 	struct trace_event_raw_##call __maybe_unused *entry;		\
7fcb7c472f455d include/trace/ftrace.h       Li Zefan                 2009-06-01  262  									\
7fcb7c472f455d include/trace/ftrace.h       Li Zefan                 2009-06-01  263  	tstruct;							\
7fcb7c472f455d include/trace/ftrace.h       Li Zefan                 2009-06-01  264  									\
7fcb7c472f455d include/trace/ftrace.h       Li Zefan                 2009-06-01  265  	return __data_size;						\
7fcb7c472f455d include/trace/ftrace.h       Li Zefan                 2009-06-01  266  }
7fcb7c472f455d include/trace/ftrace.h       Li Zefan                 2009-06-01  267


Really? 9 warnings about something that *MIGHT* be a candidate for
gnu_printf format attribute?  This is a macro that expanded into something
that could possibly use the printf format, but is nested deep in macro
magic.

Can we please shut this up?

Need a vote? Here it is: +1

Regards,
Arend



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