From patchwork Mon Oct 11 14:31:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xiongwei Song X-Patchwork-Id: 12550125 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BDE2CC433EF for ; Mon, 11 Oct 2021 14:33:56 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 1C4B960BD3 for ; Mon, 11 Oct 2021 14:33:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 1C4B960BD3 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=me.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 68F4F6B006C; Mon, 11 Oct 2021 10:33:55 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 63FF180008; Mon, 11 Oct 2021 10:33:55 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 52EAC80007; Mon, 11 Oct 2021 10:33:55 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0093.hostedemail.com [216.40.44.93]) by kanga.kvack.org (Postfix) with ESMTP id 45AE06B006C for ; Mon, 11 Oct 2021 10:33:55 -0400 (EDT) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 0ECAE30C79 for ; Mon, 11 Oct 2021 14:33:55 +0000 (UTC) X-FDA: 78684400830.05.80D712F Received: from pv50p00im-ztdg10021201.me.com (pv50p00im-ztdg10021201.me.com [17.58.6.45]) by imf24.hostedemail.com (Postfix) with ESMTP id C2B8AB001563 for ; Mon, 11 Oct 2021 14:33:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=me.com; s=1a1hai; t=1633962833; bh=S/rO3t5kGrdWm1xhXFL4TLxjsZk3v/TPzAq6dFPoZlM=; h=From:To:Subject:Date:Message-Id:MIME-Version; b=CKlxGcHgRPUv3QJCU04YubemLAoYo8cGqUO2mftxV14cixjb/P25peyNfRLktV9xl EUNXrOHa7oLDH4kL5f465Nrm7bXqrJHWFe9KjCv804CNHeKuovhEM2wuTqxLgrrWFH SnTkFdZiIYWF93IhiY4ouSJviLesODab2k6YXXk6Nkl6puTV/+pBvxfzXD6j71ITs3 nXSANPrLDGu5Hr7tzYqaB9i5F2z4X6LBhTnxSH7fRMa5hmN8jHz39i7L62vf95g65u gxNZ/dIM8dH72qNs0bggbS4pD8bVSvJW0D2x734nPpNcJXYlpOquGJAs6enNpjNM6W 7y+4pnQmQgdag== Received: from xiongwei.. (unknown [120.245.2.114]) by pv50p00im-ztdg10021201.me.com (Postfix) with ESMTPSA id 71442A405F4; Mon, 11 Oct 2021 14:33:45 +0000 (UTC) From: sxwjean@me.com To: linux-mm@kvack.org, x86@kernel.org Cc: Xiongwei Song , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Kees Cook , "H. Peter Anvin" , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Andrew Morton , Arnd Bergmann , Al Viro , Gabriel Krisman Bertazi , Lai Jiangshan , Huang Rui , Yazen Ghannam , Kim Phillips , Oleg Nesterov , Balbir Singh , "David S. Miller" , sxwjean@me.com, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/6] mm/util: Assign a meaningful value to mmap_legacy_base Date: Mon, 11 Oct 2021 22:31:45 +0800 Message-Id: <20211011143150.318239-2-sxwjean@me.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211011143150.318239-1-sxwjean@me.com> References: <20211011143150.318239-1-sxwjean@me.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.425,18.0.790 definitions=2021-10-11_05:2021-10-07,2021-10-11 signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 mlxscore=0 mlxlogscore=660 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-2009150000 definitions=main-2110110085 Authentication-Results: imf24.hostedemail.com; dkim=pass header.d=me.com header.s=1a1hai header.b=CKlxGcHg; spf=pass (imf24.hostedemail.com: domain of sxwjean@me.com designates 17.58.6.45 as permitted sender) smtp.mailfrom=sxwjean@me.com; dmarc=pass (policy=quarantine) header.from=me.com X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: C2B8AB001563 X-Stat-Signature: ndxjge15x9qfsffjug5qapy4pdsj1a43 X-HE-Tag: 1633962834-820819 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Xiongwei Song Let's assign a value to mmap_legacy_base in case the mmap() of some archs needs mmap_legacy_base, like x86. Signed-off-by: Xiongwei Song --- mm/util.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/util.c b/mm/util.c index e58151a61255..40b1a8837c0b 100644 --- a/mm/util.c +++ b/mm/util.c @@ -414,7 +414,8 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack) random_factor = arch_mmap_rnd(); if (mmap_is_legacy(rlim_stack)) { - mm->mmap_base = TASK_UNMAPPED_BASE + random_factor; + mm->mmap_legacy_base = TASK_UNMAPPED_BASE + random_factor; + mm->mmap_base = mm->mmap_legacy_base; mm->get_unmapped_area = arch_get_unmapped_area; } else { mm->mmap_base = mmap_base(random_factor, rlim_stack);