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 6251BC433EF for ; Mon, 21 Feb 2022 17:00:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc: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=8Uz6m1golyVurnzPbBQaApZlX+jWMl2E5yc1AoBSidA=; b=zhTe6sG5T7s50P fnJ2wGTVXmdDgVRexi/Znl0WbchtdrbpA4OZ6QbwGsOm01PVBqDQaPbeYddGEzyNPqLdjzxuVyKJV KQyMW6ux+QhfECuahot/olzlJxfGEzHVus1LGTreUnWgBcJaLnHGqjm95yJwU4+PxjWKURMGNRoaw XzGMjLF/AqtiyBpvDzRh2DbRgVXDOiWv6RlXD/qG/byiyBSxhu7BxCkrJ+J0qEjBqZmBN7s8otbhO OneF9SsySpHI1fE6H3J/tFdNmvGZYwC+hHZT6kQviFzjCocRZrLntpslxfpewFGLoANtTlF1Vyjyn hosaRBW+ifjU2n6Pmq9Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nMC1Y-006j4R-Jy; Mon, 21 Feb 2022 16:58:56 +0000 Received: from ams.source.kernel.org ([145.40.68.75]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nMC1V-006j32-5q for linux-arm-kernel@lists.infradead.org; Mon, 21 Feb 2022 16:58:54 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 7D5E4B80EB0; Mon, 21 Feb 2022 16:58:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 34152C340E9; Mon, 21 Feb 2022 16:58:47 +0000 (UTC) Date: Mon, 21 Feb 2022 16:58:43 +0000 From: Catalin Marinas To: Mark Brown Cc: Will Deacon , Marc Zyngier , Shuah Khan , Shuah Khan , Alan Hayward , Luis Machado , Salil Akerkar , Basant Kumar Dwivedi , Szabolcs Nagy , James Morse , Alexandru Elisei , Suzuki K Poulose , linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org, kvmarm@lists.cs.columbia.edu Subject: Re: [PATCH v11 14/40] arm64/sme: Implement support for TPIDR2 Message-ID: References: <20220207152109.197566-1-broonie@kernel.org> <20220207152109.197566-15-broonie@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20220207152109.197566-15-broonie@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220221_085853_404977_04BB22D8 X-CRM114-Status: GOOD ( 14.29 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Feb 07, 2022 at 03:20:43PM +0000, Mark Brown wrote: > The Scalable Matrix Extension introduces support for a new thread specific > data register TPIDR2 intended for use by libc. The kernel must save the > value of TPIDR2 on context switch and should ensure that all new threads > start off with a default value of 0. Add a field to the thread_struct to > store TPIDR2 and context switch it with the other thread specific data. > > In case there are future extensions which also use TPIDR2 we introduce > system_supports_tpidr2() and use that rather than system_supports_sme() > for TPIDR2 handling. > > Signed-off-by: Mark Brown I think this matches the ABI per the documentation (and the subsequent discussion we had). Reviewed-by: Catalin Marinas _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel