From patchwork Thu Jun 20 05:03:23 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandre Ghiti X-Patchwork-Id: 1119123 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=sparclinux-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=ghiti.fr Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 45TqZR0HbGz9s9y for ; Thu, 20 Jun 2019 15:07:43 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726211AbfFTFHj (ORCPT ); Thu, 20 Jun 2019 01:07:39 -0400 Received: from relay5-d.mail.gandi.net ([217.70.183.197]:37991 "EHLO relay5-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726122AbfFTFHj (ORCPT ); Thu, 20 Jun 2019 01:07:39 -0400 X-Originating-IP: 79.86.19.127 Received: from alex.numericable.fr (127.19.86.79.rev.sfr.net [79.86.19.127]) (Authenticated sender: alex@ghiti.fr) by relay5-d.mail.gandi.net (Postfix) with ESMTPSA id 72B251C0005; Thu, 20 Jun 2019 05:07:19 +0000 (UTC) From: Alexandre Ghiti To: Andrew Morton Cc: "James E . J . Bottomley" , Helge Deller , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Yoshinori Sato , Rich Felker , "David S . Miller" , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H . Peter Anvin" , x86@kernel.org, Dave Hansen , Andy Lutomirski , Peter Zijlstra , linux-parisc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-mm@kvack.org, Alexandre Ghiti Subject: [PATCH RESEND 3/8] sparc: Start fallback of top-down mmap at mm->mmap_base Date: Thu, 20 Jun 2019 01:03:23 -0400 Message-Id: <20190620050328.8942-4-alex@ghiti.fr> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190620050328.8942-1-alex@ghiti.fr> References: <20190620050328.8942-1-alex@ghiti.fr> MIME-Version: 1.0 Sender: sparclinux-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: sparclinux@vger.kernel.org In case of mmap failure in top-down mode, there is no need to go through the whole address space again for the bottom-up fallback: the goal of this fallback is to find, as a last resort, space between the top-down mmap base and the stack, which is the only place not covered by the top-down mmap. Signed-off-by: Alexandre Ghiti --- arch/sparc/kernel/sys_sparc_64.c | 2 +- arch/sparc/mm/hugetlbpage.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c index ccc88926bc00..ea1de1e5fa8d 100644 --- a/arch/sparc/kernel/sys_sparc_64.c +++ b/arch/sparc/kernel/sys_sparc_64.c @@ -206,7 +206,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, if (addr & ~PAGE_MASK) { VM_BUG_ON(addr != -ENOMEM); info.flags = 0; - info.low_limit = TASK_UNMAPPED_BASE; + info.low_limit = mm->mmap_base; info.high_limit = STACK_TOP32; addr = vm_unmapped_area(&info); } diff --git a/arch/sparc/mm/hugetlbpage.c b/arch/sparc/mm/hugetlbpage.c index f78793a06bbd..9c67f805abc8 100644 --- a/arch/sparc/mm/hugetlbpage.c +++ b/arch/sparc/mm/hugetlbpage.c @@ -86,7 +86,7 @@ hugetlb_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, if (addr & ~PAGE_MASK) { VM_BUG_ON(addr != -ENOMEM); info.flags = 0; - info.low_limit = TASK_UNMAPPED_BASE; + info.low_limit = mm->mmap_base; info.high_limit = STACK_TOP32; addr = vm_unmapped_area(&info); }