linux-kernel - Re: [kbuild-all] Re: include/trace/trace_events.h:261:16: error: function 'trace_event_get_offsets_iwlwifi_dbg' might be a candidate for 'gnu

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Message-ID: <b612432e-7f21-4c79-5553-35ad7bdc6fd2@intel.com>
Date:   Tue, 25 Oct 2022 08:49:41 +0800
From:   "Chen, Rong A" <rong.a.chen@...el.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     kernel test robot <lkp@...el.com>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Gregory Greenman <gregory.greenman@...el.com>,
        linux-wireless@...r.kernel.org
Subject: Re: [kbuild-all] Re: include/trace/trace_events.h:261:16: error:
 function 'trace_event_get_offsets_iwlwifi_dbg' might be a candidate for
 'gnu_printf' format attribute



On 10/24/2022 10:35 PM, Steven Rostedt wrote:
> On Mon, 24 Oct 2022 15:26:00 +0800
> "Chen, Rong A" <rong.a.chen@...el.com> wrote:
> 
>> On 10/21/2022 10:10 PM, Steven Rostedt wrote:
>>> On Fri, 21 Oct 2022 22:07:17 +0800
>>> kernel test robot <lkp@...el.com> wrote:
>>>    
>>>> Hi Steven,
>>>>
>>>> FYI, the error/warning still remains.
>>>
>>>     WONT FIX
>>>
>>> I thought we already discussed getting rid of this warning?
>>
>> Hi Steve,
>>
>> Sorry for the noise, the bot doesn't ignore this warning with prefix
>> 'error:', we will fix it.
> 
> Ug. Let me guess, is this compiled with -Werror?
> 
> Because a warning about a macro that may or may not create printf
> formatting, where gcc thinks it needs a gcc printf attribute and warns
> about it, is not something to fail the build on.
> 
> For any build that fails on warnings, that specific warning needs to be
> silenced.
> 
> I mean, "-Werror=suggest-attribute=format", really?

yes, it's compiled with -Werror if using 'W=1' option:

 >>>>>> include/trace/trace_events.h:261:16: error: function 
'trace_event_get_offsets_iwlwifi_dbg' might be a candidate for 
'gnu_printf' format attribute [-Werror=suggest-attribute=format]

Best Regards,
Rong Chen

> 
> -- Steve
> 
>>>    
>>>>
>>>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>>>> head:   e35184f321518acadb681928a016da21a9a20c13
>>>> commit: c7c37bb87590886e08d24dec53089f74b89f5fbb tracing/iwlwifi: Use the new __vstring() helper
>>>> date:   3 months ago
>>>> config: x86_64-sof-customedconfig-edison-defconfig
>>>> compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
>>>> reproduce (this is a W=1 build):
>>>>           # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c7c37bb87590886e08d24dec53089f74b89f5fbb
>>>>           git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>>>           git fetch --no-tags linus master
>>>>           git checkout c7c37bb87590886e08d24dec53089f74b89f5fbb
>>>>           # save the config file
>>>>           mkdir build_dir && cp config build_dir/.config
>>>>           make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/net/wireless/intel/iwlwifi/
>>>>
>>>> If you fix the issue, kindly add following tag where applicable
>>>> | Reported-by: kernel test robot <lkp@...el.com>
>>>>
>>>> All errors (new ones prefixed by >>):
>>>>
>>>>      In file included from include/trace/define_trace.h:102,
>>>>                       from drivers/net/wireless/intel/iwlwifi/iwl-devtrace-msg.h:71,
>>>>                       from drivers/net/wireless/intel/iwlwifi/iwl-devtrace.h:91,
>>>>                       from drivers/net/wireless/intel/iwlwifi/iwl-devtrace.c:15:
>>>>      drivers/net/wireless/intel/iwlwifi/./iwl-devtrace-msg.h: In function 'trace_event_get_offsets_iwlwifi_dbg':
>>>>>> include/trace/trace_events.h:261:16: error: function 'trace_event_get_offsets_iwlwifi_dbg' might be a candidate for 'gnu_printf' format attribute [-Werror=suggest-attribute=format]
>>>>        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/intel/iwlwifi/./iwl-devtrace-msg.h:49:1: note: in expansion of macro 'TRACE_EVENT'
>>>>         49 | TRACE_EVENT(iwlwifi_dbg,
>>>>            | ^~~~~~~~~~~
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