From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f44.google.com (mail-wm1-f44.google.com [209.85.128.44]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4397E25487E for ; Thu, 8 May 2025 09:14:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.44 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746695665; cv=none; b=ckG53Bsa9HiwEk3K8jm1/R8Y1phriRPRHbBWtA/QUVou/dLmUdalJFnhljXAGEDdJkoIUb49L1vx82cIvLCucqbe6La0LROspwA6m/Dd2UgGac4SZedCJ7yW8W7aAyrSwzKXZG2PrboZXRYgsjyuMt1K/Zprpacfp5M6IxqFEgo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746695665; c=relaxed/simple; bh=2LdP/A4VnpSZ8Arqppmfa4jFk7aBo9TTHIHZC8kq8fc=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=j+aI5ZnfpHCFyqjpuL0CLe9U1+kNX+Tk+WVWbxcgTRgbmDzaJrRC5fLVpXfLImIO82PHK4bipuyGSJXG1X6YWnUbYINrvH2YsRMhE2qxEuawOyNrIgtjXju9uq9cK9PPtljwPfhGPb7KY7aZCFoi2qpTyHEF/98gYdc1xUIXK60= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=CIGqmhx5; arc=none smtp.client-ip=209.85.128.44 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="CIGqmhx5" Received: by mail-wm1-f44.google.com with SMTP id 5b1f17b1804b1-43d0618746bso5497565e9.2 for ; Thu, 08 May 2025 02:14:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1746695662; x=1747300462; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=jtD1t5SqwVfSCPyTjNxq3c+2H14P2VPj1wlw+YRYZjE=; b=CIGqmhx5vL5fqu1yATZFv0VZ58N3X9p2mnpm+RxoOfE2E/sKWC3SimKxPjDQSNOy78 kuW4q1OZWYz/54l0ZkWvyPA+AkJOKR2LJCJu91rImNHryJm5U86bJXhHiaXo4rI/5Pfy qXhLWufic3L967jB3PV9NbQZDnEKJRdko6eIg6bF0pZuARSKDPk+AZ+6WgO5j8mwEfdS U3GE6T484/kem3qM6y5Rj7280Ph3DgU0fY/TIcXloJfIpfZ0JufH9aB4GboZqCJ0SpC9 doSywFvyZVU4VDEpyG4C67moons+UdqbQ0WIETw/tsxY0tSq+shtyPhgUB6wQNc5zkSK 0kTw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1746695662; x=1747300462; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=jtD1t5SqwVfSCPyTjNxq3c+2H14P2VPj1wlw+YRYZjE=; b=WYKf2VPWxsnvZcguapBUO0k/bEEcCAcMEvDhObkNqeVndwZaqR4wUH0N7EJFxQpcVu HH6qF+dDsCCvi8quVQeictYqi3iImS36+Y5dYx3WrMydR+iGgorXFwqVc4XXRcvHd9pb uKm+JusecmRd+5illjd+9f/DV1xPVof/eAZudyPSFBFs6YII67/0Xl/pjf45vvQeb+XK krZ+zPKOsPMqhxjtPw/4yZeSI7fXkegUk5WH/ckGdWcL84z1tKdqzXCT3H13ZhClfsRs PywNBIJPrNhDtF04F3c4NrIjKp6EAG2QFiqrfwsZAei7RbDJnvcB8OzhxKjtXnoUPKAO b71g== X-Forwarded-Encrypted: i=1; AJvYcCUSc84rDum9J868womZQya82w+IyQ3Vq7hnHb7MWG7kjRXsR0msdRYkobUxc10nWcmm87uoAz9lqlt0CdA=@vger.kernel.org X-Gm-Message-State: AOJu0Yzq2hso/icoUCVc39gMT59RRk2xDYQNVHupWtQr2ynYHCWlid81 fUfs86V2qa5Ovf8bCFU3nqLj143FhTzdZHeIvs4flMF7p7GIk2SY+UaTQ2ONsg== X-Gm-Gg: ASbGncsx8QgjgfzoZH6+XBQMXwDZCz0W//ewVfdnupiYXko4gqeeJzquC+Mam+QA8nh /oHtC5xyrEA55nnE50JF15wAPxY81Z2okTBZwNpMBJ1Qrp1qzMpT+3CTnmWl0k2+bvHpxLn8p3E ep61mAiVM/yDOkk0qTdS8+9uFzW8qFh23FCHL5uKXtc3yD/BWMdzKo1CIptKxZ6k4X7HfVnkd+l kq3SteG7OtGKd+MDUBfknjLiWib1DJeurrGPRTftExWU9IhWOk1sW4Wrd7jEAYLkkTiPhSJOuK3 Vsx1iVwcbFl49RuI0+y2nTNqyiOT9xdTUCL5oNjPzmr/lxZRAlAdI73OAN/x9vtNmE7ir5qlij/ 5BqzXKg== X-Google-Smtp-Source: AGHT+IF9SUYOnKs3lJu1vUeKHxmfYUfp4eeX4TzwT3TxRpgJ2RHbyMATX+EQtKICG97KoSCFK8KYGg== X-Received: by 2002:a05:600c:3e84:b0:43c:eeee:b70a with SMTP id 5b1f17b1804b1-441d44dd23dmr51647125e9.22.1746695662495; Thu, 08 May 2025 02:14:22 -0700 (PDT) Received: from google.com (24.204.140.34.bc.googleusercontent.com. [34.140.204.24]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-442cd333326sm29694785e9.16.2025.05.08.02.14.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 May 2025 02:14:22 -0700 (PDT) Date: Thu, 8 May 2025 10:14:18 +0100 From: Vincent Donnefort To: Steven Rostedt Cc: 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, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, jstultz@google.com, qperret@google.com, will@kernel.org, kernel-team@android.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH v4 02/24] tracing: Introduce trace remotes Message-ID: References: <20250506164820.515876-1-vdonnefort@google.com> <20250506164820.515876-3-vdonnefort@google.com> <20250507202444.43963c84@gandalf.local.home> 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: <20250507202444.43963c84@gandalf.local.home> [...] > > + remote->cbs->unload_trace_buffer(remote->trace_buffer_desc, remote->priv); > > + return -ENOMEM; > > + } > > + > > + return 0; > > +} > > + > > +static void trace_remote_unload(struct trace_remote *remote) > > +{ > > + lockdep_assert_held(&remote->lock); > > + > > + if (!trace_remote_loaded(remote) || trace_remote_busy(remote)) > > + return; > > Can this cause leaks? Should trace_remote_unload() return an error value to > let the caller know it wasn't unloaded? No risk of leak here. This acts a like a refcount to make sure the buffer is unloaded only when no one is reading and tracing_on=0. [...]