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Sat, 07 Nov 2026 23:25:09 -0800 (PST) Received: from lipengfei28-ThinkStation-P368.mioffice.cn ([2408:8607:1b00:8:5213:762b:b24:1be1]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-37265a16f9csm3499775eec.12.2026.11.07.23.25.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 07 Nov 2026 23:25:08 -0800 (PST) From: Pengfei Li X-Google-Original-From: Pengfei Li To: lkp@intel.com Cc: rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, mark.rutland@arm.com, corbet@lwn.net, skhan@linuxfoundation.org, oe-kbuild-all@lists.linux.dev, linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, zhangbo56@xiaomi.com, lipengfei28@xiaomi.com Subject: Re: [PATCH v8 2/5] tracing: Use the stackmap from the ftrace stack recording path Date: Sun, 8 Nov 2026 15:24:48 +0800 Message-Id: <20261108072448.990755-1-lipengfei28@xiaomi.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <202611080654.sqFxIlwl-lkp@intel.com> References: <20261107055139.3138633-1-lipengfei28@xiaomi.com> <20261107055139.3138633-3-lipengfei28@xiaomi.com> <202611080654.sqFxIlwl-lkp@intel.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Sun, 08 Nov 2026 06:35:01 +0800, kernel test robot wrote: > kernel/trace/trace.c: In function 'record_stackmap': > include/linux/rcupdate.h:502:9: error: dereferencing pointer to incomplete type 'struct ftrace_stackmap' struct ftrace_stackmap is only defined in trace_stackmap.c, and GCC before 10 rejects typeof(*p) on the incomplete type in rcu_dereference_sched(). I reproduced it with GCC 8.5. v9 will move the rcu_dereference_sched() into ftrace_stackmap_get_cookie(), which will take the trace_array instead of the map. -- Pengfei