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=-5.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 59CE6C33CB1 for ; Tue, 14 Jan 2020 11:56:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3A04F24672 for ; Tue, 14 Jan 2020 11:56:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729657AbgANL4W (ORCPT ); Tue, 14 Jan 2020 06:56:22 -0500 Received: from foss.arm.com ([217.140.110.172]:51304 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725956AbgANL4V (ORCPT ); Tue, 14 Jan 2020 06:56:21 -0500 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 A25AA1435; Tue, 14 Jan 2020 03:56:20 -0800 (PST) Received: from mbp (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 9B3433F6C4; Tue, 14 Jan 2020 03:56:18 -0800 (PST) Date: Tue, 14 Jan 2020 11:56:14 +0000 From: Catalin Marinas To: Suzuki K Poulose Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, will@kernel.org, maz@kernel.org, ard.biesheuvel@linaro.org, mark.rutland@arm.com Subject: Re: [PATCH v3 2/7] arm64: fpsimd: Make sure SVE setup is complete before SIMD is used Message-ID: <20200114115613.GC2289@mbp> References: <20200113233023.928028-1-suzuki.poulose@arm.com> <20200113233023.928028-3-suzuki.poulose@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200113233023.928028-3-suzuki.poulose@arm.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jan 13, 2020 at 11:30:18PM +0000, Suzuki K Poulose wrote: > In-kernel users of NEON rely on may_use_simd() to check if the SIMD > can be used. However, we must initialize the SVE before SIMD can > be used. Add a sanity check to make sure that we have completed the > SVE setup before anyone uses the SIMD. > > Cc: Ard Biesheuvel > Cc: Mark Rutland > Cc: Will Deacon > Cc: Catalin Marinas > Signed-off-by: Suzuki K Poulose Reviewed-by: Catalin Marinas