From patchwork Wed Jun 19 05:42:16 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandre Ghiti X-Patchwork-Id: 11003419 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5C42276 for ; Wed, 19 Jun 2019 05:42:46 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4C8D928AC4 for ; Wed, 19 Jun 2019 05:42:46 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4030728B44; Wed, 19 Jun 2019 05:42:46 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E342F28B38 for ; Wed, 19 Jun 2019 05:42:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726246AbfFSFmp (ORCPT ); Wed, 19 Jun 2019 01:42:45 -0400 Received: from relay2-d.mail.gandi.net ([217.70.183.194]:57845 "EHLO relay2-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725899AbfFSFmp (ORCPT ); Wed, 19 Jun 2019 01:42:45 -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 relay2-d.mail.gandi.net (Postfix) with ESMTPSA id B0F1240011; Wed, 19 Jun 2019 05:42:27 +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 0/8] Fix mmap base in bottom-up mmap Date: Wed, 19 Jun 2019 01:42:16 -0400 Message-Id: <20190619054224.5983-1-alex@ghiti.fr> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Sender: linux-parisc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This series fixes the fallback of the top-down mmap: in case of failure, a bottom-up scheme can be tried as a last resort between the top-down mmap base and the stack, hoping for a large unused stack limit. Lots of architectures and even mm code start this fallback at TASK_UNMAPPED_BASE, which is useless since the top-down scheme already failed on the whole address space: instead, simply use mmap_base. Along the way, it allows to get rid of of mmap_legacy_base and mmap_compat_legacy_base from mm_struct. Note that arm and mips already implement this behaviour. Alexandre Ghiti (8): s390: Start fallback of top-down mmap at mm->mmap_base sh: Start fallback of top-down mmap at mm->mmap_base sparc: Start fallback of top-down mmap at mm->mmap_base x86, hugetlbpage: Start fallback of top-down mmap at mm->mmap_base mm: Start fallback top-down mmap at mm->mmap_base parisc: Use mmap_base, not mmap_legacy_base, as low_limit for bottom-up mmap x86: Use mmap_*base, not mmap_*legacy_base, as low_limit for bottom-up mmap mm: Remove mmap_legacy_base and mmap_compat_legacy_code fields from mm_struct arch/parisc/kernel/sys_parisc.c | 8 +++----- arch/s390/mm/mmap.c | 2 +- arch/sh/mm/mmap.c | 2 +- arch/sparc/kernel/sys_sparc_64.c | 2 +- arch/sparc/mm/hugetlbpage.c | 2 +- arch/x86/include/asm/elf.h | 2 +- arch/x86/kernel/sys_x86_64.c | 4 ++-- arch/x86/mm/hugetlbpage.c | 7 ++++--- arch/x86/mm/mmap.c | 20 +++++++++----------- include/linux/mm_types.h | 2 -- mm/debug.c | 4 ++-- mm/mmap.c | 2 +- 12 files changed, 26 insertions(+), 31 deletions(-)