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 X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5986BC31E45 for ; Thu, 13 Jun 2019 12:28:43 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 30DDF21721 for ; Thu, 13 Jun 2019 12:28:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="sX1pduC5" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 30DDF21721 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=wVgwlAi2kXOy6b2q3ameOursRf52DYDcWRD//ivT0YA=; b=sX1pduC5xuUxxO +YauRP9loE7SIu1Sxcwozw9ctu63aT5kONKGNHPRBgY62yf725FKgxkk2vaCZBnhD93N7j6qnhXUn x34PkMopl9HffsGlubOsurA5paPhNS3IZsHVTjXuOCMumcZpYZ11E8lfoqkTfFwcsZ7UAFpgojPJy b8f3HNfbNupb93So7RE1fByhXiLDUIhvasECeAfHjw/Gd9qRdWdkI92r3laRRKkS9zEhdBtOMM9+i CMxO5r3A2Z6azxKXGLnESPzny4cudto8MKMv9CG8BcglSX7E8aG1HL0oyHb69yQZKvZ+3lHhnpMjU SBeWWHSCdGHebYaHQXFw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hbOqQ-00027Y-Ja; Thu, 13 Jun 2019 12:28:42 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hbOqN-00026b-1f for linux-arm-kernel@lists.infradead.org; Thu, 13 Jun 2019 12:28:40 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id A1E6A2B; Thu, 13 Jun 2019 05:28:38 -0700 (PDT) Received: from C02TF0J2HF1T.local (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C3B393F694; Thu, 13 Jun 2019 05:28:32 -0700 (PDT) Date: Thu, 13 Jun 2019 13:28:21 +0100 From: Catalin Marinas To: Dave Martin Subject: Re: [PATCH v4 1/2] arm64: Define Documentation/arm64/tagged-address-abi.txt Message-ID: <20190613122821.GS28951@C02TF0J2HF1T.local> References: <20190612142111.28161-1-vincenzo.frascino@arm.com> <20190612142111.28161-2-vincenzo.frascino@arm.com> <20190612153538.GL28951@C02TF0J2HF1T.local> <141c740a-94c2-2243-b6d1-b44ffee43791@arm.com> <20190613113731.GY28398@e103592.cambridge.arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190613113731.GY28398@e103592.cambridge.arm.com> User-Agent: Mutt/1.11.2 (2019-01-07) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190613_052839_131121_E45636A7 X-CRM114-Status: GOOD ( 11.79 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, Szabolcs Nagy , Andrey Konovalov , Will Deacon , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Alexander Viro , linux-kselftest@vger.kernel.org, Vincenzo Frascino , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Jun 13, 2019 at 12:37:32PM +0100, Dave P Martin wrote: > On Thu, Jun 13, 2019 at 11:15:34AM +0100, Vincenzo Frascino wrote: > > On 12/06/2019 16:35, Catalin Marinas wrote: > > > On Wed, Jun 12, 2019 at 03:21:10PM +0100, Vincenzo Frascino wrote: > > >> + - PR_GET_TAGGED_ADDR_CTRL: can be used to check the status of the Tagged > > >> + Address ABI. [...] > Is there a canonical way to detect whether this whole API/ABI is > available? (i.e., try to call this prctl / check for an HWCAP bit, > etc.) The canonical way is a prctl() call. HWCAP doesn't make sense since it's not a hardware feature. If you really want a different way of detecting this (which I don't think it's worth), we can reinstate the AT_FLAGS bit. -- Catalin _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel