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=-8.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 ED9E9C43613 for ; Thu, 20 Jun 2019 05:05:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C69E0208CB for ; Thu, 20 Jun 2019 05:05:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726168AbfFTFFL (ORCPT ); Thu, 20 Jun 2019 01:05:11 -0400 Received: from relay9-d.mail.gandi.net ([217.70.183.199]:57929 "EHLO relay9-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725857AbfFTFFL (ORCPT ); Thu, 20 Jun 2019 01:05:11 -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 relay9-d.mail.gandi.net (Postfix) with ESMTPSA id DA6C6FF804; Thu, 20 Jun 2019 05:04:55 +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 1/8] s390: Start fallback of top-down mmap at mm->mmap_base Date: Thu, 20 Jun 2019 01:03:21 -0400 Message-Id: <20190620050328.8942-2-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 Content-Transfer-Encoding: 8bit Sender: linux-parisc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-parisc@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/s390/mm/mmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c index cbc718ba6d78..4a222969843b 100644 --- a/arch/s390/mm/mmap.c +++ b/arch/s390/mm/mmap.c @@ -166,7 +166,7 @@ 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 = TASK_SIZE; addr = vm_unmapped_area(&info); if (addr & ~PAGE_MASK) -- 2.20.1