linux-kernel - Re: [PATCH v5 2/3] tracing: Add a tracepoint verification check at build time

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Message-ID: <202507261823.mtwUpXNM-lkp@intel.com>
Date: Sat, 26 Jul 2025 18:36:58 +0800
From: kernel test robot <lkp@...el.com>
To: Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
	llvm@...ts.linux.dev
Cc: oe-kbuild-all@...ts.linux.dev, Masami Hiramatsu <mhiramat@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Arnd Bergmann <arnd@...db.de>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas.schier@...ux.dev>,
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
	Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH v5 2/3] tracing: Add a tracepoint verification check at
 build time

Hi Steven,

kernel test robot noticed the following build warnings:

[auto build test WARNING on masahiroy-kbuild/for-next]
[also build test WARNING on masahiroy-kbuild/fixes trace/for-next arnd-asm-generic/master linus/master v6.16-rc7 next-20250725]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Steven-Rostedt/sorttable-Move-ELF-parsing-into-scripts-elf-parse-ch/20250725-105526
base:   https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git for-next
patch link:    https://lore.kernel.org/r/20250725025213.342188378%40kernel.org
patch subject: [PATCH v5 2/3] tracing: Add a tracepoint verification check at build time
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20250726/202507261823.mtwUpXNM-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250726/202507261823.mtwUpXNM-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/202507261823.mtwUpXNM-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> scripts/tracepoint-update.c:106:6: warning: variable 'count' set but not used [-Wunused-but-set-variable]
     106 |         int count = 0;
         |             ^
   1 warning generated.
--
>> scripts/tracepoint-update.c:106:6: warning: variable 'count' set but not used [-Wunused-but-set-variable]
     106 |         int count = 0;
         |             ^
   1 warning generated.


vim +/count +106 scripts/tracepoint-update.c

   102	
   103	static void check_tracepoints(struct elf_tracepoint *etrace)
   104	{
   105		Elf_Ehdr *ehdr = etrace->ehdr;
 > 106		int count = 0;
   107		int len;
   108	
   109		if (!etrace->array)
   110			return;
   111	
   112		for_each_shdr_str(len, ehdr, tracepoint_data_sec) {
   113			if (!len)
   114				continue;
   115			if (!find_event(str, etrace->array, etrace->count)) {
   116				fprintf(stderr, "warning: tracepoint '%s' is unused.\n", str);
   117			}
   118			count++;
   119		}
   120	
   121		free(etrace->array);
   122	}
   123	

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