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=-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 A9D53C3B18B for ; Thu, 13 Feb 2020 15:51:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7363F20675 for ; Thu, 13 Feb 2020 15:51:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581609111; bh=ekNF1XJ/qYgMN/nUl8sbw+VuaMbnXSJOcrNAXY7nZHc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=X5ee1NSh2Ul77TxwbUtRl29NsjzVWH6VV9U8LvE73IHptnpSQcmAsfudGllDJwD9m ovjZU9OMnA7jXbYsGRuqVgTkPYZLkcdRPLOdrwijHNd2l4QOnf0cxnRUGNa1ua2uux 3jwlt28VA/c8qgalijRi4uKJy9DsQDqhG4VqE9ks= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729540AbgBMPvu (ORCPT ); Thu, 13 Feb 2020 10:51:50 -0500 Received: from mail.kernel.org ([198.145.29.99]:43864 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728735AbgBMP0K (ORCPT ); Thu, 13 Feb 2020 10:26:10 -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 A5424218AC; Thu, 13 Feb 2020 15:26:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581607569; bh=ekNF1XJ/qYgMN/nUl8sbw+VuaMbnXSJOcrNAXY7nZHc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=P9v7fv18oVA2fC+hLp8hTKZHuHtH64QujlwKs5DrufvT26b4CobVvmEueOLUznu61 fz/IcSYbyZDL7pzcpvN7Z2lFi15083ByHpyg+9zTOGhJHQdL3NPsBoYvz3VBIagUjp bN2ZViApimxR5aMb2X+pclRIJlDGiPxMElQp8t4s= 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 4.14 162/173] arm64: cpufeature: Fix the type of no FP/SIMD capability Date: Thu, 13 Feb 2020 07:21:05 -0800 Message-Id: <20200213152012.031049106@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200213151931.677980430@linuxfoundation.org> References: <20200213151931.677980430@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 @@ -1103,7 +1103,7 @@ 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, },