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Mon, 09 Mar 2026 09:26:08 -0700 (PDT) Date: Mon, 9 Mar 2026 16:24:54 +0000 In-Reply-To: <20260309162516.2623589-1-vdonnefort@google.com> Mime-Version: 1.0 References: <20260309162516.2623589-1-vdonnefort@google.com> X-Mailer: git-send-email 2.53.0.473.g4a7958ca14-goog Message-ID: <20260309162516.2623589-9-vdonnefort@google.com> Subject: [PATCH v14 08/30] tracing: Add init callback to trace remotes From: Vincent Donnefort To: rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, linux-trace-kernel@vger.kernel.org, maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com Cc: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, jstultz@google.com, qperret@google.com, will@kernel.org, aneesh.kumar@kernel.org, kernel-team@android.com, linux-kernel@vger.kernel.org, Vincent Donnefort Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260309_092610_438203_54942220 X-CRM114-Status: GOOD ( 12.09 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add a .init call back so the trace remote callers can add entries to the tracefs directory. Reviewed-by: Steven Rostedt (Google) Signed-off-by: Vincent Donnefort diff --git a/include/linux/trace_remote.h b/include/linux/trace_remote.h index 10ca03dc192b..090c58b7d92b 100644 --- a/include/linux/trace_remote.h +++ b/include/linux/trace_remote.h @@ -3,10 +3,13 @@ #ifndef _LINUX_TRACE_REMOTE_H #define _LINUX_TRACE_REMOTE_H +#include #include /** * struct trace_remote_callbacks - Callbacks used by Tracefs to control the remote + * @init: Called once the remote has been registered. Allows the + * caller to extend the Tracefs remote directory * @load_trace_buffer: Called before Tracefs accesses the trace buffer for the first * time. Must return a &trace_buffer_desc * (most likely filled with trace_remote_alloc_buffer()) @@ -22,6 +25,7 @@ * new reader-page from the @cpu ring-buffer. */ struct trace_remote_callbacks { + int (*init)(struct dentry *d, void *priv); struct trace_buffer_desc *(*load_trace_buffer)(unsigned long size, void *priv); void (*unload_trace_buffer)(struct trace_buffer_desc *desc, void *priv); int (*enable_tracing)(bool enable, void *priv); diff --git a/kernel/trace/trace_remote.c b/kernel/trace/trace_remote.c index 039ba71c3b3e..294d051dcef1 100644 --- a/kernel/trace/trace_remote.c +++ b/kernel/trace/trace_remote.c @@ -863,6 +863,7 @@ static int trace_remote_init_tracefs(const char *name, struct trace_remote *remo int trace_remote_register(const char *name, struct trace_remote_callbacks *cbs, void *priv) { struct trace_remote *remote; + int ret; remote = kzalloc_obj(*remote); if (!remote) @@ -880,7 +881,11 @@ int trace_remote_register(const char *name, struct trace_remote_callbacks *cbs, return -ENOMEM; } - return 0; + ret = cbs->init ? cbs->init(remote->dentry, priv) : 0; + if (ret) + pr_err("Init failed for trace remote '%s' (%d)\n", name, ret); + + return ret; } EXPORT_SYMBOL_GPL(trace_remote_register); -- 2.53.0.473.g4a7958ca14-goog