linux-kernel - Re: [PATCH v1 1/3] kunit: fix bug in debugfs logs of parameterized tests

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Date:   Fri, 3 Feb 2023 14:52:04 +0800
From:   kernel test robot <lkp@...el.com>
To:     Rae Moar <rmoar@...gle.com>, brendanhiggins@...gle.com,
        davidgow@...gle.com, dlatypov@...gle.com
Cc:     llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
        skhan@...uxfoundation.org, kunit-dev@...glegroups.com,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        Rae Moar <rmoar@...gle.com>
Subject: Re: [PATCH v1 1/3] kunit: fix bug in debugfs logs of parameterized
 tests

Hi Rae,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on 766f4f2514d2d18bcbd60a058188fb502dea5ddf]

url:    https://github.com/intel-lab-lkp/linux/commits/Rae-Moar/kunit-fix-bug-in-debugfs-logs-of-parameterized-tests/20230201-060537
base:   766f4f2514d2d18bcbd60a058188fb502dea5ddf
patch link:    https://lore.kernel.org/r/20230131220355.1603527-2-rmoar%40google.com
patch subject: [PATCH v1 1/3] kunit: fix bug in debugfs logs of parameterized tests
config: hexagon-randconfig-r045-20230202 (https://download.01.org/0day-ci/archive/20230203/202302031414.TsTAA8Dr-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 4196ca3278f78c6e19246e54ab0ecb364e37d66a)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/c8b669e1d139e1ee08121b184d859e45d7a02940
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Rae-Moar/kunit-fix-bug-in-debugfs-logs-of-parameterized-tests/20230201-060537
        git checkout c8b669e1d139e1ee08121b184d859e45d7a02940
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash lib/kunit/

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

All warnings (new ones prefixed by >>):

>> lib/kunit/test.c:115:6: warning: stack frame size (1536) exceeds limit (1024) in 'kunit_log_append' [-Wframe-larger-than]
   void kunit_log_append(char *log, const char *fmt, ...)
        ^
   12/1536 (0.78%) spills, 1524/1536 (99.22%) variables
   1 warning generated.


vim +/kunit_log_append +115 lib/kunit/test.c

acd8e8407b8fcc David Gow    2021-08-03  110  
e2219db280e3fe Alan Maguire 2020-03-26  111  /*
e2219db280e3fe Alan Maguire 2020-03-26  112   * Append formatted message to log, size of which is limited to
e2219db280e3fe Alan Maguire 2020-03-26  113   * KUNIT_LOG_SIZE bytes (including null terminating byte).
e2219db280e3fe Alan Maguire 2020-03-26  114   */
e2219db280e3fe Alan Maguire 2020-03-26 @115  void kunit_log_append(char *log, const char *fmt, ...)
e2219db280e3fe Alan Maguire 2020-03-26  116  {
e2219db280e3fe Alan Maguire 2020-03-26  117  	char line[KUNIT_LOG_SIZE];
e2219db280e3fe Alan Maguire 2020-03-26  118  	va_list args;
e2219db280e3fe Alan Maguire 2020-03-26  119  	int len_left;
e2219db280e3fe Alan Maguire 2020-03-26  120  
e2219db280e3fe Alan Maguire 2020-03-26  121  	if (!log)
e2219db280e3fe Alan Maguire 2020-03-26  122  		return;
e2219db280e3fe Alan Maguire 2020-03-26  123  
e2219db280e3fe Alan Maguire 2020-03-26  124  	len_left = KUNIT_LOG_SIZE - strlen(log) - 1;
e2219db280e3fe Alan Maguire 2020-03-26  125  	if (len_left <= 0)
e2219db280e3fe Alan Maguire 2020-03-26  126  		return;
e2219db280e3fe Alan Maguire 2020-03-26  127  
e2219db280e3fe Alan Maguire 2020-03-26  128  	va_start(args, fmt);
e2219db280e3fe Alan Maguire 2020-03-26  129  	vsnprintf(line, sizeof(line), fmt, args);
e2219db280e3fe Alan Maguire 2020-03-26  130  	va_end(args);
e2219db280e3fe Alan Maguire 2020-03-26  131  
e2219db280e3fe Alan Maguire 2020-03-26  132  	strncat(log, line, len_left);
e2219db280e3fe Alan Maguire 2020-03-26  133  }
e2219db280e3fe Alan Maguire 2020-03-26  134  EXPORT_SYMBOL_GPL(kunit_log_append);
e2219db280e3fe Alan Maguire 2020-03-26  135  

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