From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 086B72EC562 for ; Tue, 10 Mar 2026 14:35:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773153354; cv=none; b=quYG8Jym/Ot9OA1bkVgQq6DmjvxmignwRAywspRVE3B4+4ZF+oQszjsKnNR96/DJKHbc7Xt6jQStppNC3xxrQuIeM509o73WTGNd+Ktfrubi+GlpnWxAFnNRctXaewEYYlpRWNL69LEC3WABhxN0MNC0j4S63pqcoCmb1MYhaaA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773153354; c=relaxed/simple; bh=kYbiXOPuVGOroyWoxFMDuoeFz3UkkhK+6WqtOJnIkG8=; h=Message-ID:Date:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=lP/euj4tdTBY+Ngo7GXiYPKidJICqCIyTVn2SaIsZpQYhbkWuz03ZtnUTYXuxTktgqnfXxxnTmkY1akRd/fuSYhcv9o2KLoGeM1IOjG3Owgjvi/xV5V0h8jv9F1Pl6NUZt//yK+BzluU3J3ALZoaUy4h129l+umOKWLCCNhsMUg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=BUksUygd; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="BUksUygd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D0E5CC2BC9E; Tue, 10 Mar 2026 14:35:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773153353; bh=kYbiXOPuVGOroyWoxFMDuoeFz3UkkhK+6WqtOJnIkG8=; h=Date:From:To:Cc:Subject:References:From; b=BUksUygdMlAek7OTFf03qFN5keLnwzA5ZyDJt0BBTHKm008P+lf93cscbrhWXbVnp RZBbYHa8f2DXL8ZF9yKB7I7cqWoFNLS8p7O1OLmyy+HdYj5lPXe8YMdi3yZ875X3QF 9KJ+vR10YYi17f2CQatvcr/bSs1RN8RKAuIIo39QCSwdDvLfmmjIIUc2zJgp5svvtc S08z33oWkABy9ZvOxYNPxjXGhLTHZqFidS7xYajK8iWVrkWI63ZMWFW60xd9HWqYqd /+B9HhH5ou4zcuLLIKICjg021Lgim9ZUYXB7EvcoE52l940Kw9yIHq+ZiPUuo8VFwe t/MBNazxgIy1A== Received: from rostedt by gandalf with local (Exim 4.99.1) (envelope-from ) id 1vzyBn-00000002ZdG-43X1; Tue, 10 Mar 2026 10:36:03 -0400 Message-ID: <20260310143603.837196939@kernel.org> User-Agent: quilt/0.69 Date: Tue, 10 Mar 2026 10:35:23 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Masami Hiramatsu , Mark Rutland , Mathieu Desnoyers , Andrew Morton , Vincent Donnefort Subject: [for-next][PATCH 08/18] tracing: Add init callback to trace remotes References: <20260310143515.132579088@kernel.org> 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=UTF-8 From: Vincent Donnefort Add a .init call back so the trace remote callers can add entries to the tracefs directory. Link: https://patch.msgid.link/20260309162516.2623589-9-vdonnefort@google.com Reviewed-by: Steven Rostedt (Google) Signed-off-by: Vincent Donnefort Signed-off-by: Steven Rostedt (Google) --- include/linux/trace_remote.h | 4 ++++ kernel/trace/trace_remote.c | 7 ++++++- 2 files changed, 10 insertions(+), 1 deletion(-) 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); -- 2.51.0