From patchwork Fri Dec 10 18:40:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 12670639 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6BC1AC433F5 for ; Fri, 10 Dec 2021 18:43:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237371AbhLJSrX (ORCPT ); Fri, 10 Dec 2021 13:47:23 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60926 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237207AbhLJSrW (ORCPT ); Fri, 10 Dec 2021 13:47:22 -0500 Received: from sin.source.kernel.org (sin.source.kernel.org [IPv6:2604:1380:40e1:4800::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 85883C061746 for ; Fri, 10 Dec 2021 10:43:47 -0800 (PST) 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 sin.source.kernel.org (Postfix) with ESMTPS id D0A22CE2C89 for ; Fri, 10 Dec 2021 18:43:45 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5BBDFC341C5; Fri, 10 Dec 2021 18:43:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1639161824; bh=n/w7AweH9L8FxO6JYJptKDInrWPMknCr7JxAnBAUncs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=unqHgp9pT3/BnxfOK9/MrQBDy0ekpDwgQw3vOaBmKXtaBh3Kh7arPVDqPf2J/Zols bpXKRZxyT3FtUYi3WMnyvgkVtCPsBxycU3Va5sYcDGQJJUn5BBtPNiH+QHDjjKPCOe Uq29zAAy5fMVtIJYjR/XCdfXV3oijvGkvfPH5AMoEZ1i4t+Mbv8KJ/ieblagQQ+vtH 4ZewsIbReAua/+Io7giBw6mdR0JPAFHKriGc2NxP1tSslgy726W+KDl/HLKY1Z0rSo S90gpp08jSMKq6q8THsQdmz9kyGaBSwKE95MkKqhYM1ozumQB5E7D+69j87X5y44UB zqSZJ1BsQUihg== From: Mark Brown To: Catalin Marinas , Will Deacon , Shuah Khan , Shuah Khan Cc: Alan Hayward , Luis Machado , Salil Akerkar , Basant Kumar Dwivedi , Szabolcs Nagy , linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org, Mark Brown , Luis Machado Subject: [PATCH v7 03/37] arm64/sve: Minor clarification of ABI documentation Date: Fri, 10 Dec 2021 18:40:59 +0000 Message-Id: <20211210184133.320748-4-broonie@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211210184133.320748-1-broonie@kernel.org> References: <20211210184133.320748-1-broonie@kernel.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1041; h=from:subject; bh=n/w7AweH9L8FxO6JYJptKDInrWPMknCr7JxAnBAUncs=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBhs59AbdYv2hXbEyhOJ3EEommD5opdHGXoM9/MryFW 8NF/teCJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCYbOfQAAKCRAk1otyXVSH0JCDB/ 4tpwABWmZ+7O4HZ17p61JjA8D3sab7J/SBktpYcv1fBxhhY6GAcPPylJrXQt2QvtaMWJnWavbtgP9N M+wRT9+GDTzrgAtThSkj5e/QtCPn5Y880HkILtq6CS2PWFm8zoW/dOzp93oFpAsa88/R2wOT9AGJiu atiywgqaI11XC+umRqonXnaMAWuE3RvlDW2KfBlF7hvE9BYjibTb6fPQtPuTX4dMv4NGYTDe1HKoHn KMebWjkMLQcJVCUtNqYWNGI6r0wNzmKXvd77O2xttl9lPqr0pIfSwmLAvci3cXCxxLtCZu2clXaihn Sr0Y/6B517gNBAQ39rSRD9gelkULiX X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org As suggested by Luis for the SME version of this explicitly say that the vector length should be extracted from the return value of a set vector length prctl() with a bitwise and rather than just any old and. Suggested-by: Luis Machado Signed-off-by: Mark Brown --- Documentation/arm64/sve.rst | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Documentation/arm64/sve.rst b/Documentation/arm64/sve.rst index 03137154299e..9d9a4de5bc34 100644 --- a/Documentation/arm64/sve.rst +++ b/Documentation/arm64/sve.rst @@ -255,7 +255,7 @@ prctl(PR_SVE_GET_VL) vector length change (which would only normally be the case between a fork() or vfork() and the corresponding execve() in typical use). - To extract the vector length from the result, and it with + To extract the vector length from the result, bitwise and it with PR_SVE_VL_LEN_MASK. Return value: a nonnegative value on success, or a negative value on error: