From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id AFBC0CA0ED3 for ; Mon, 2 Sep 2024 18:56:43 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 432898D00FF; Mon, 2 Sep 2024 14:56:43 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 38F908D00E7; Mon, 2 Sep 2024 14:56:43 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 257038D00FF; Mon, 2 Sep 2024 14:56:43 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 077458D00E7 for ; Mon, 2 Sep 2024 14:56:43 -0400 (EDT) Received: from smtpin07.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id B50B81202F9 for ; Mon, 2 Sep 2024 18:56:42 +0000 (UTC) X-FDA: 82520704644.07.CFF7414 Received: from nyc.source.kernel.org (nyc.source.kernel.org [147.75.193.91]) by imf04.hostedemail.com (Postfix) with ESMTP id 35A6F40006 for ; Mon, 2 Sep 2024 18:56:41 +0000 (UTC) Authentication-Results: imf04.hostedemail.com; dkim=none; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=arm.com (policy=none); spf=pass (imf04.hostedemail.com: domain of cmarinas@kernel.org designates 147.75.193.91 as permitted sender) smtp.mailfrom=cmarinas@kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1725303332; a=rsa-sha256; cv=none; b=UsmmeSN0fGiC5MXv0TGPHHcosrGl1U4WbeOjDsX3z0Ivl0iAzfwpYQFFE61Oi3FAwG/chh pcmj2Oz5xiJsnl8CihQ3aSe2ngD0XVihzl6UskpEgo+AC+1nFtu/CsGbWHmRJdgkbEXU+h GdgYLM3iQ+bt4vzGI9Q9QvHof63x1jc= ARC-Authentication-Results: i=1; imf04.hostedemail.com; dkim=none; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=arm.com (policy=none); spf=pass (imf04.hostedemail.com: domain of cmarinas@kernel.org designates 147.75.193.91 as permitted sender) smtp.mailfrom=cmarinas@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1725303332; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=YMZdBaUPrnr52AW6qIHhqurBpRrUmNYtp92FQ4V6yIk=; b=IHaYpzRAofPCnNkBfPYVGq5a0IO9TC4R3tH6XQdVNrnxFR2dWc3U5YPytBH6t6bixWKyPy BiQG4Wb8FxFLY6TGw60CFLtQ3JxbN/v/sEj5hXFlG/CBX/rx7EgS0gJntCpsIRaLBrdH6t B09TcVapADAG0EXZo/ZcYNYYQbxn87k= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 70878A431B5; Mon, 2 Sep 2024 18:56:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 63A22C4CECB; Mon, 2 Sep 2024 18:56:34 +0000 (UTC) Date: Mon, 2 Sep 2024 19:56:32 +0100 From: Catalin Marinas To: Mark Brown Cc: Will Deacon , Jonathan Corbet , Andrew Morton , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Arnd Bergmann , Oleg Nesterov , Eric Biederman , Shuah Khan , "Rick P. Edgecombe" , Deepak Gupta , Ard Biesheuvel , Szabolcs Nagy , Kees Cook , "H.J. Lu" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Florian Weimer , Christian Brauner , Thiago Jung Bauermann , Ross Burton , Yury Khrustalev , Wilco Dijkstra , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, kvmarm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org Subject: Re: [PATCH v12 26/39] arm64/ptrace: Expose GCS via ptrace and core files Message-ID: References: <20240829-arm64-gcs-v12-0-42fec947436a@kernel.org> <20240829-arm64-gcs-v12-26-42fec947436a@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240829-arm64-gcs-v12-26-42fec947436a@kernel.org> X-Rspamd-Queue-Id: 35A6F40006 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: ca418u4xdyg8uw9ssu3mrrmauo116m8w X-HE-Tag: 1725303401-280307 X-HE-Meta: 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 YtgEssQ6 plevrfh5aaHdftCOVaE4G3GJC8QAcRkTGT6kA1RoLCYe1fFR7O2F+AQzqT6VYuRnetVEZFtvpMFApI/MaYcrCBnqz4DeDDy+ks3iPSnpWp6PwjWwAdoJq8GZ1jJo8cgfwKj1znaee38BlorEUbHrbh8TdmVsMKaJVmi86HUJUg5G0xt5XZEeydPZKlEO+5jiYgJ4/dVGcznIl9Z9hYpMsT9Nopaley4qBasGSH3CL9/ThA65HU8qmGtL6sr7M3qLcU67zPsxwOqKbTt+0KIC3SIZ9+SVkDFww0bCKLcrr5IooqiraphM8/gEiPUouuvdJL9wwcB8Rp/HgmJUE7dooLxF3ms9i5EX3kTg/ddqA06NFd/ICsXc4fqZCfgPZl+85/9892DOu9eUsxbkJzlNaAXSOVU5w8MTzlCyc X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Aug 29, 2024 at 12:27:42AM +0100, Mark Brown wrote: > +static int gcs_get(struct task_struct *target, > + const struct user_regset *regset, > + struct membuf to) > +{ > + struct user_gcs user_gcs; > + > + if (target == current) > + gcs_preserve_current_state(); What's the use-case where target == current and do we need something similar for gcs_set()? -- Catalin