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Mon, 05 Jan 2026 07:23:34 -0800 (PST) Received: from localhost ([196.207.164.177]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-432bc9dfaa2sm152913f8f.0.2026.01.05.07.23.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 05 Jan 2026 07:23:34 -0800 (PST) Date: Mon, 5 Jan 2026 18:23:31 +0300 From: Dan Carpenter To: oe-kbuild@lists.linux.dev, Steven Rostedt , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Cc: lkp@intel.com, oe-kbuild-all@lists.linux.dev, Masami Hiramatsu , Mark Rutland , Mathieu Desnoyers , Andrew Morton , Linux Memory Management List Subject: Re: [PATCH 3/5] tracing: Have tracer option be instance specific Message-ID: <202511071533.domGENBS-lkp@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251105161935.545400234@kernel.org> Hi Steven, kernel test robot noticed the following build warnings: https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Steven-Rostedt/tracing-Remove-dummy-options-and-flags/20251106-010511 base: https://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace for-next patch link: https://lore.kernel.org/r/20251105161935.545400234%40kernel.org patch subject: [PATCH 3/5] tracing: Have tracer option be instance specific config: i386-randconfig-r072-20251107 (https://download.01.org/0day-ci/archive/20251107/202511071533.domGENBS-lkp@intel.com/config) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) 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 | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202511071533.domGENBS-lkp@intel.com/ smatch warnings: kernel/trace/trace.c:6313 tracing_set_tracer() warn: iterator used outside loop: 't' vim +/t +6313 kernel/trace/trace.c 9c5b9d3d65e4858 Masami Hiramatsu 2020-01-11 6285 int tracing_set_tracer(struct trace_array *tr, const char *buf) 09d23a1d8a82e81 Steven Rostedt (Red Hat 2015-02-03 6286) { 4699bbb369ba1d3 Steven Rostedt 2025-11-05 6287 struct tracer *trace; 4699bbb369ba1d3 Steven Rostedt 2025-11-05 6288 struct tracers *t; 12883efb670c28d Steven Rostedt (Red Hat 2013-03-05 6289) #ifdef CONFIG_TRACER_MAX_TRACE 34600f0e9c33c9c Steven Rostedt 2013-01-22 6290 bool had_max_tr; 12883efb670c28d Steven Rostedt (Red Hat 2013-03-05 6291) #endif d33b10c0c73adca Steven Rostedt 2024-12-24 6292 int ret; bc0c38d139ec7fc Steven Rostedt 2008-05-12 6293 d33b10c0c73adca Steven Rostedt 2024-12-24 6294 guard(mutex)(&trace_types_lock); 1027fcb206a0fb8 Steven Rostedt 2009-03-12 6295 7a1d1e4b9639ff0 Steven Rostedt (Google 2024-06-12 6296) update_last_data(tr); 7a1d1e4b9639ff0 Steven Rostedt (Google 2024-06-12 6297) a1f157c7a3bb342 Zheng Yejian 2023-09-06 6298 if (!tr->ring_buffer_expanded) { 2b6080f28c7cc3e Steven Rostedt 2012-05-11 6299 ret = __tracing_resize_ring_buffer(tr, trace_buf_size, 438ced1720b5840 Vaibhav Nagarnaik 2012-02-02 6300 RING_BUFFER_ALL_CPUS); 73c5162aa362a54 Steven Rostedt 2009-03-11 6301 if (ret < 0) d33b10c0c73adca Steven Rostedt 2024-12-24 6302 return ret; 73c5162aa362a54 Steven Rostedt 2009-03-11 6303 ret = 0; 73c5162aa362a54 Steven Rostedt 2009-03-11 6304 } 73c5162aa362a54 Steven Rostedt 2009-03-11 6305 4699bbb369ba1d3 Steven Rostedt 2025-11-05 6306 list_for_each_entry(t, &tr->tracers, list) { 4699bbb369ba1d3 Steven Rostedt 2025-11-05 6307 if (strcmp(t->tracer->name, buf) == 0) bc0c38d139ec7fc Steven Rostedt 2008-05-12 6308 break; bc0c38d139ec7fc Steven Rostedt 2008-05-12 6309 } d33b10c0c73adca Steven Rostedt 2024-12-24 6310 if (!t) t can't be NULL here. It needs to be if (list_entry_is_head()) return; d33b10c0c73adca Steven Rostedt 2024-12-24 6311 return -EINVAL; d33b10c0c73adca Steven Rostedt 2024-12-24 6312 4699bbb369ba1d3 Steven Rostedt 2025-11-05 @6313 if (t->tracer == tr->current_trace) d33b10c0c73adca Steven Rostedt 2024-12-24 6314 return 0; bc0c38d139ec7fc Steven Rostedt 2008-05-12 6315 4699bbb369ba1d3 Steven Rostedt 2025-11-05 6316 trace = t->tracer; 4699bbb369ba1d3 Steven Rostedt 2025-11-05 6317 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki