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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 09A79CD13CF for ; Mon, 2 Sep 2024 18:57:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=YMZdBaUPrnr52AW6qIHhqurBpRrUmNYtp92FQ4V6yIk=; b=nwJ4pZOqMesocMUrnC8Hd7fMiO nmLCgI9la9SZ3z4c5Uht9ZaAIsJguHL88PXJVfD30L2nQNTb0R2bpZFx893sqfZ9J8dDzhPxpvwx5 2xNGKoedcE6jfQCVPoYlV7d6TQUdNlz0TVSO+QZcq8w5PoQ2pvJRjL57NOVoaDkoNEhuxrA5L4R+b gHCTWGYbO2LenOxEciafFMRq6ywQsNveQpzSIL5SK/H/SoOlm3mWtf8WexIK9g1wNK+26rQCp/7U3 XbLbMGQWf+zbuf3L0FbDkX9DRd84pQYuDH4JFxEERSh/7li7nA0iz8CGAHoQo1kwMF3mCICItLXCI ggiyhl5A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1slCF8-0000000FKrh-2jPe; Mon, 02 Sep 2024 18:57:38 +0000 Received: from nyc.source.kernel.org ([2604:1380:45d1:ec00::3]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1slCED-0000000FKdm-21UY; Mon, 02 Sep 2024 18:56:42 +0000 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-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240902_115641_601480_A0A17BCA X-CRM114-Status: UNSURE ( 9.63 ) X-CRM114-Notice: Please train this message. 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 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