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=-4.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS, T_DKIMWL_WL_HIGH,URIBL_BLOCKED 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 EF018C07E85 for ; Fri, 7 Dec 2018 19:56:53 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id AE4952083D for ; Fri, 7 Dec 2018 19:56:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="YN7QTQdo" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AE4952083D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Mime-Version:References:In-Reply-To: Message-Id:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=QeB82l2JE9g8UpuiL45e+0496x7NHsPx8u5HmZE1aBM=; b=YN7QTQdoSfqxk6 H2HER0/TdB2c9NOAen6/GU6H5VXh4h4SkmU7OKN4L2T8gvKEfJoviswJ/Uv+G2k6IIf/fNoNv1ddd CZEwxyWk2jgMyJ1JVEZhUK1Bxh+ucSVS5fo9FTQjXyr3ZI8HpcY49sWprZsZBAMAZuZJiBdw21MLX 7AjQIkpxjQBYdKb/eIuL/+z/35JGMIso8kAu9HRoRzar64Owh/GfAme11WZ71HST/3WCaPk9DgQdR UEkWjFzeRZDxrwFj5MXnSkfCdxX6xWF82PovLREBWBXwjkNCFVbIGp+rcydVPUouvJGhTlUTOJkMU 62HOdFmkZ4EAlJUqCNyQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gVMF0-0002aW-8m; Fri, 07 Dec 2018 19:56:50 +0000 Received: from mail.linuxfoundation.org ([140.211.169.12]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gVMEw-0002XU-JV for linux-arm-kernel@lists.infradead.org; Fri, 07 Dec 2018 19:56:48 +0000 Received: from akpm3.svl.corp.google.com (unknown [104.133.8.65]) by mail.linuxfoundation.org (Postfix) with ESMTPSA id 6BE99B3F; Fri, 7 Dec 2018 19:56:33 +0000 (UTC) Date: Fri, 7 Dec 2018 11:56:32 -0800 From: Andrew Morton To: Steve Capper Subject: Re: [PATCH V5 1/7] mm: mmap: Allow for "high" userspace addresses Message-Id: <20181207115632.6d5cb691d65cb92917f9d21d@linux-foundation.org> In-Reply-To: <20181206225042.11548-2-steve.capper@arm.com> References: <20181206225042.11548-1-steve.capper@arm.com> <20181206225042.11548-2-steve.capper@arm.com> X-Mailer: Sylpheed 3.6.0 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20181207_115646_662498_CA3C672E X-CRM114-Status: GOOD ( 12.13 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: suzuki.poulose@arm.com, catalin.marinas@arm.com, ard.biesheuvel@linaro.org, will.deacon@arm.com, linux-mm@kvack.org, jcm@redhat.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, 6 Dec 2018 22:50:36 +0000 Steve Capper wrote: > This patch adds support for "high" userspace addresses that are > optionally supported on the system and have to be requested via a hint > mechanism ("high" addr parameter to mmap). > > Architectures such as powerpc and x86 achieve this by making changes to > their architectural versions of arch_get_unmapped_* functions. However, > on arm64 we use the generic versions of these functions. > > Rather than duplicate the generic arch_get_unmapped_* implementations > for arm64, this patch instead introduces two architectural helper macros > and applies them to arch_get_unmapped_*: > arch_get_mmap_end(addr) - get mmap upper limit depending on addr hint > arch_get_mmap_base(addr, base) - get mmap_base depending on addr hint > > If these macros are not defined in architectural code then they default > to (TASK_SIZE) and (base) so should not introduce any behavioural > changes to architectures that do not define them. > > Signed-off-by: Steve Capper > Reviewed-by: Catalin Marinas > Cc: Andrew Morton Acked-by: Andrew Morton _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel