linux-kernel - drivers/hwtracing/stm/ftrace.c:38: warning: Function parameter or struct member 'export' not described in 'stm_ftrace

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Message-ID: <202412280133.JV62su59-lkp@intel.com>
Date: Fri, 27 Dec 2024 23:35:28 +0800
From: kernel test robot <lkp@...el.com>
To: Tingwei Zhang <tingwei@...eaurora.org>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	"Steven Rostedt (VMware)" <rostedt@...dmis.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: drivers/hwtracing/stm/ftrace.c:38: warning: Function parameter or
 struct member 'export' not described in 'stm_ftrace_write'

Hi Tingwei,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   d6ef8b40d075c425f548002d2f35ae3f06e9cf96
commit: 7b9749bd830848bca9179b0a16251ca3c36e82e6 stm class: ftrace: Change dependency to TRACING
date:   4 years, 3 months ago
config: sh-randconfig-001-20241212 (https://download.01.org/0day-ci/archive/20241228/202412280133.JV62su59-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 12.4.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241228/202412280133.JV62su59-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202412280133.JV62su59-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/hwtracing/stm/ftrace.c:38: warning: Function parameter or struct member 'export' not described in 'stm_ftrace_write'


vim +38 drivers/hwtracing/stm/ftrace.c

262e1f6e39143c Chunyan Zhang 2016-11-21  30  
262e1f6e39143c Chunyan Zhang 2016-11-21  31  /**
262e1f6e39143c Chunyan Zhang 2016-11-21  32   * stm_ftrace_write() - write data to STM via 'stm_ftrace' source
262e1f6e39143c Chunyan Zhang 2016-11-21  33   * @buf:	buffer containing the data packet
262e1f6e39143c Chunyan Zhang 2016-11-21  34   * @len:	length of the data packet
262e1f6e39143c Chunyan Zhang 2016-11-21  35   */
262e1f6e39143c Chunyan Zhang 2016-11-21  36  static void notrace
a773d419275bf5 Felipe Balbi  2017-06-02  37  stm_ftrace_write(struct trace_export *export, const void *buf, unsigned int len)
262e1f6e39143c Chunyan Zhang 2016-11-21 @38  {
a773d419275bf5 Felipe Balbi  2017-06-02  39  	struct stm_ftrace *stm = container_of(export, struct stm_ftrace, ftrace);
a773d419275bf5 Felipe Balbi  2017-06-02  40  
a773d419275bf5 Felipe Balbi  2017-06-02  41  	stm_source_write(&stm->data, STM_FTRACE_CHAN, buf, len);
262e1f6e39143c Chunyan Zhang 2016-11-21  42  }
262e1f6e39143c Chunyan Zhang 2016-11-21  43  

:::::: The code at line 38 was first introduced by commit
:::::: 262e1f6e39143c2a0f559e2fb4a835069a7693a9 stm class: ftrace: Add ftrace-export-over-stm driver

:::::: TO: Chunyan Zhang <zhang.chunyan@...aro.org>
:::::: CC: Steven Rostedt <rostedt@...dmis.org>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki