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

From: Chen, Rong A
Date: Wed Jul 06 2022 - 07:52:08 EST

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On 7/6/2022 5:09 PM, Arend Van Spriel wrote:

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

Hi,

Sorry for the noise, we'll stop reporting this warning next time.

Best Regards,
Rong Chen

Next message: Mel Gorman: "Re: [mm/page_alloc] 2bd8eec68f: BUG:sleeping_function_called_from_invalid_context_at_mm/gup.c"
Previous message: Vasant Hegde: "Re: linux-next: Signed-off-by missing for commit in the iommu tree"
In reply to: Arend Van Spriel: "Re: [PATCH 04/13] tracing/brcm: Use the new __vstring() helper"
Next in thread: Steven Rostedt: "[PATCH 03/13] tracing/ath: Use the new __vstring() helper"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]