From patchwork Thu Apr 28 09:28:04 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Russell King X-Patchwork-Id: 8967291 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 065DA9F441 for ; Thu, 28 Apr 2016 09:31:45 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 33C54202AE for ; Thu, 28 Apr 2016 09:31:44 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5C5F9202C8 for ; Thu, 28 Apr 2016 09:31:42 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1aviH6-0007Tr-Ea; Thu, 28 Apr 2016 09:30:20 +0000 Received: from pandora.arm.linux.org.uk ([2001:4d48:ad52:3201:214:fdff:fe10:1be6]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1aviGl-0005JS-Bu for linux-arm-kernel@lists.infradead.org; Thu, 28 Apr 2016 09:30:01 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=arm.linux.org.uk; s=pandora-2014; h=Date:Sender:Message-Id:Content-Type:Content-Transfer-Encoding:MIME-Version:Subject:Cc:To:From:References:In-Reply-To; bh=hlvgDv55r7qepFpES/s7skRKCizOEDFrbe0cuVibAPE=; b=p4+fUr6nEwJ2e7fIB+iU/C/mGVbTgSnN7fcOuNRdfTqOFnoAc0ZpGp3qFIlxY2WzeYv+m0gMFMlT/28t2XVMRtTd0XjOK53yl55zHm3NeYa2aeJLijwMRbgX5uCCzDHLP6Y3qiNGyFBafkC8LxH6zRqk8HSlk+X/12dUBkVKWMs=; Received: from e0022681537dd.dyn.arm.linux.org.uk ([fd8f:7570:feb6:1:222:68ff:fe15:37dd]:45723 helo=rmk-PC.arm.linux.org.uk) by pandora.arm.linux.org.uk with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.82_1-5b7a7c0-XX) (envelope-from ) id 1aviF1-0004Am-4V; Thu, 28 Apr 2016 10:28:11 +0100 Received: from rmk by rmk-PC.arm.linux.org.uk with local (Exim 4.82_1-5b7a7c0-XX) (envelope-from ) id 1aviEu-0000ix-C1; Thu, 28 Apr 2016 10:28:04 +0100 In-Reply-To: <20160428092644.GX19428@n2100.arm.linux.org.uk> References: <20160428092644.GX19428@n2100.arm.linux.org.uk> From: Russell King To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 04/12] ARM: provide arm_has_idmap_alias() helper MIME-Version: 1.0 Content-Disposition: inline Message-Id: Date: Thu, 28 Apr 2016 10:28:04 +0100 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160428_023000_183890_AADDC611 X-CRM114-Status: UNSURE ( 9.18 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -5.3 (-----) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree@vger.kernel.org, Tony Luck , linux-ia64@vger.kernel.org, linux-doc@vger.kernel.org, Pawel Moll , Jonathan Corbet , Ian Campbell , kexec@lists.infradead.org, Fenghua Yu , Haren Myneni , Rob Herring , Eric Biederman , Santosh Shilimkar , Kumar Gala , Vivek Goyal Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-5.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED,RP_MATCHES_RCVD,T_DKIM_INVALID,UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Provide a helper to indicate whether we need to perform special handling for boot identity mapping aliases or not. Signed-off-by: Russell King Reviewed-by: Pratyush Anand --- arch/arm/include/asm/memory.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h index ca208335fde6..31c07a2cc100 100644 --- a/arch/arm/include/asm/memory.h +++ b/arch/arm/include/asm/memory.h @@ -295,6 +295,11 @@ extern long long arch_phys_to_idmap_offset; * of physical memory for idmap purposes. Most cases should leave these * untouched. Note: this can only return addresses less than 4GiB. */ +static inline bool arm_has_idmap_alias(void) +{ + return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0; +} + #define IDMAP_INVALID_ADDR ((u32)~0) static inline unsigned long phys_to_idmap(phys_addr_t addr)