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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 116C0C7EE23 for ; Thu, 8 Jun 2023 19:12:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235922AbjFHTML (ORCPT ); Thu, 8 Jun 2023 15:12:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58866 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234046AbjFHTMK (ORCPT ); Thu, 8 Jun 2023 15:12:10 -0400 Received: from mail-yw1-x112c.google.com (mail-yw1-x112c.google.com [IPv6:2607:f8b0:4864:20::112c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F26FB2733 for ; Thu, 8 Jun 2023 12:12:04 -0700 (PDT) Received: by mail-yw1-x112c.google.com with SMTP id 00721157ae682-561b7729a12so30964457b3.1 for ; Thu, 08 Jun 2023 12:12:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1686251524; x=1688843524; h=mime-version:references:message-id:in-reply-to:subject:cc:to:from :date:from:to:cc:subject:date:message-id:reply-to; bh=zVLRceEeXaiGvlgxdYbIgAo+AcDyW1dS+jDGBb+h1UA=; b=1l3g323zHExDgYGww0zFXmVgic3jDwyc0JAOaU14MB4NUoruSezWtFEVocvA8VR+wP D+bOPBhVpeN5TR7Q94HiD/7UXFwgvkn75HwqVtdM3hi/WhalPJUwiHRXSp3bpeKIuRdm orIqBvL0rae06pUEOxuRX8a0MpgqpKjI5TTzLJ98WQmBBEIDz4RhToD7qotfuISdygmL gKqyyQ61v8JQcZhpfriPzCyTWiXBbfQnLuFCKxtspZkjhV60I7fgSoyr0iHs2+KGMqLW csaRWwWg7YMEgY5GV8POPk7y+6y3olAQXOM6liWFfJYYRJ0sFo+4jM2u98tnCjYnFP0Y 93kg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1686251524; x=1688843524; h=mime-version:references:message-id:in-reply-to:subject:cc:to:from :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=zVLRceEeXaiGvlgxdYbIgAo+AcDyW1dS+jDGBb+h1UA=; b=Ils574D75doew+52tBU5lHLeH4Xa+NFQKo6FmB2fBljQQ9HmDPv3/QXcPCAg7CjyT0 ova17VSkISkhfJJ57FLiDtaOtgFJi060BGTPNMLNfh8OsTs2jss3oYe+vbyMI7RLVv5+ PMUJ5a1LZAQ3J8/y3um5sdu9+jx5AjBZFuXI61uzFU+pPjrjjN2pzb80hFz/LGrRR9+6 Qp2PqOfdJ5hgDqP18E0H97SrKEMwyidFjjKeYLZuGPfC5MlBCuDN7ntFXECLvg2gk8sh iQOlKDqkRC8gYUr0ScoJ5YasdoujBKfI+sYVllpUZ6V28gIMUXo+Z+pRlC82tAyY2y4+ MGcw== X-Gm-Message-State: AC+VfDzDe3UZR05SsFywyy3Wdb0f4/jKDVYhZToyrsXqXVJPYMEwwaox W3rjFh6S3DXwaSnsEPooclynLA== X-Google-Smtp-Source: ACHHUZ6kOJKeygbedx9f6pcNR03LNZvYC4ZecjCRxiqOz1IuKMf5mVIHIRdEhOcWlcOzm+o3M8bu5Q== X-Received: by 2002:a0d:ead2:0:b0:569:ec03:14eb with SMTP id t201-20020a0dead2000000b00569ec0314ebmr668029ywe.23.1686251523870; Thu, 08 Jun 2023 12:12:03 -0700 (PDT) Received: from ripple.attlocal.net (172-10-233-147.lightspeed.sntcca.sbcglobal.net. [172.10.233.147]) by smtp.gmail.com with ESMTPSA id d144-20020a814f96000000b00559f1cb8444sm106718ywb.70.2023.06.08.12.12.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Jun 2023 12:12:03 -0700 (PDT) Date: Thu, 8 Jun 2023 12:11:59 -0700 (PDT) From: Hugh Dickins X-X-Sender: hugh@ripple.attlocal.net To: Andrew Morton cc: Mike Kravetz , Mike Rapoport , "Kirill A. Shutemov" , Matthew Wilcox , David Hildenbrand , Suren Baghdasaryan , Qi Zheng , Peter Zijlstra , Russell King , Catalin Marinas , Will Deacon , Geert Uytterhoeven , Greg Ungerer , Michal Simek , Thomas Bogendoerfer , Helge Deller , John David Anglin , "Aneesh Kumar K.V" , Michael Ellerman , Alexandre Ghiti , Palmer Dabbelt , Heiko Carstens , Christian Borntraeger , Claudio Imbrenda , Alexander Gordeev , John Paul Adrian Glaubitz , "David S. Miller" , Chris Zankel , Max Filippov , x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v2 02/23] arm64: allow pte_offset_map() to fail In-Reply-To: Message-ID: <35e46485-8499-4337-c51f-b8fa495a1a93@google.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org In rare transient cases, not yet made possible, pte_offset_map() and pte_offset_map_lock() may not find a page table: handle appropriately. Signed-off-by: Hugh Dickins Acked-by: Catalin Marinas --- arch/arm64/mm/fault.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index cb21ccd7940d..f3aaba853547 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -177,6 +177,9 @@ static void show_pte(unsigned long addr) break; ptep = pte_offset_map(pmdp, addr); + if (!ptep) + break; + pte = READ_ONCE(*ptep); pr_cont(", pte=%016llx", pte_val(pte)); pte_unmap(ptep); -- 2.35.3