From patchwork Thu Feb 13 15:21:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 231436 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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 E8C21C3B18B for ; Thu, 13 Feb 2020 15:45:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B76F520661 for ; Thu, 13 Feb 2020 15:45:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581608714; bh=dFdzzarvAnU4bC10RLMRXRLW9GdfSigpZSNr4TdWn1Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=GIGD7zq1xdhddZLCTIhbfyX1JQ4CKWvhRk13d4fdp0VnydO7WbAVrW/wZFdl7Gdza b3ywCAhuxaVxW0xoSdGda900Gh3Z4qVyzDdqOtnLxf3cDuX+p1rylPVCs9xhX0QZbO 5JoMyjK7+FUdceigqa0svtDcv1ubqgTwE2oSSaiE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728970AbgBMPpO (ORCPT ); Thu, 13 Feb 2020 10:45:14 -0500 Received: from mail.kernel.org ([198.145.29.99]:51148 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729430AbgBMP1d (ORCPT ); Thu, 13 Feb 2020 10:27:33 -0500 Received: from localhost (unknown [104.132.1.104]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 75133206DB; Thu, 13 Feb 2020 15:27:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581607652; bh=dFdzzarvAnU4bC10RLMRXRLW9GdfSigpZSNr4TdWn1Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qJyxAa0OjY2vK8+Gr8WpRfKsLAbFD9TLRQN/R1Sam5zk24ZV7S2rdIoCaeYtK0G+N 8k9t0xERikiIk0WwqwVgtXS9ygVmyIflb8tS7Uyopbronfi17mEFbBQvNCjF4S3MBd hs4SqKj7p4qElTppwXYAjt6Jt4mXbEgsaL5jmnvs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Will Deacon , Mark Rutland , Ard Biesheuvel , Catalin Marinas , Suzuki K Poulose Subject: [PATCH 5.4 65/96] arm64: cpufeature: Fix the type of no FP/SIMD capability Date: Thu, 13 Feb 2020 07:21:12 -0800 Message-Id: <20200213151904.029786736@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200213151839.156309910@linuxfoundation.org> References: <20200213151839.156309910@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Suzuki K Poulose commit 449443c03d8cfdacf7313e17779a2594ebf87e6d upstream. The NO_FPSIMD capability is defined with scope SYSTEM, which implies that the "absence" of FP/SIMD on at least one CPU is detected only after all the SMP CPUs are brought up. However, we use the status of this capability for every context switch. So, let us change the scope to LOCAL_CPU to allow the detection of this capability as and when the first CPU without FP is brought up. Also, the current type allows hotplugged CPU to be brought up without FP/SIMD when all the current CPUs have FP/SIMD and we have the userspace up. Fix both of these issues by changing the capability to BOOT_RESTRICTED_LOCAL_CPU_FEATURE. Fixes: 82e0191a1aa11abf ("arm64: Support systems without FP/ASIMD") Cc: Will Deacon Cc: Mark Rutland Reviewed-by: Ard Biesheuvel Reviewed-by: Catalin Marinas Signed-off-by: Suzuki K Poulose Signed-off-by: Will Deacon Signed-off-by: Greg Kroah-Hartman --- arch/arm64/kernel/cpufeature.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -1367,7 +1367,7 @@ static const struct arm64_cpu_capabiliti { /* FP/SIMD is not implemented */ .capability = ARM64_HAS_NO_FPSIMD, - .type = ARM64_CPUCAP_SYSTEM_FEATURE, + .type = ARM64_CPUCAP_BOOT_RESTRICTED_CPU_LOCAL_FEATURE, .min_field_value = 0, .matches = has_no_fpsimd, },