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 42167C77B7C for ; Wed, 10 May 2023 04:43:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233865AbjEJEny (ORCPT ); Wed, 10 May 2023 00:43:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44666 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229673AbjEJEnx (ORCPT ); Wed, 10 May 2023 00:43:53 -0400 Received: from mail-yw1-x1133.google.com (mail-yw1-x1133.google.com [IPv6:2607:f8b0:4864:20::1133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CA60C40F6 for ; Tue, 9 May 2023 21:43:51 -0700 (PDT) Received: by mail-yw1-x1133.google.com with SMTP id 00721157ae682-55aa1da9d4aso120819977b3.2 for ; Tue, 09 May 2023 21:43:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1683693831; x=1686285831; h=mime-version:references:message-id:in-reply-to:subject:cc:to:from :date:from:to:cc:subject:date:message-id:reply-to; bh=Qgvg6hJeX3BMksFNsRntaPo5LAnqTckLGOVnbotKcuE=; b=XSdzuZPhWyo8ejurmvHVm33GJPjVUgijuALNChj5du7O2iYt4Q9Jq2Q59opuXgmszK vq4MYv/Ooq0tJSiRkeuI3pPx9DX2hUCIacbsKIYs/Pr4tOgH5bBu2nqMFCUfyb6E02pf jBk8Kt3LARkTDDVXin2DqNhLRNsinTPL45U22h6RflNgwq03hTBYZXyT9mTDfKsms4Zh 4IIRYWo2iyv3RHOXtIB0KC/5A3EJw7nNYEHLsDPx36g0ObzRlzcFoxapfv0z0w7dMYbs CoJBrp445oAQqRN0sKHpj5OzjqC03ok8JMyhyd58GQQ6Bw92QvpdqQzmSHjTpSRLST1k j19g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1683693831; x=1686285831; 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=Qgvg6hJeX3BMksFNsRntaPo5LAnqTckLGOVnbotKcuE=; b=hkEYUdnUqFoNLJGtFTF8A/uY7niaq3gsm27Nb+ajPWg0nc+YcIo43DPndCZce/kKXY 0V2TtW4v/IAMehQcUEm7D6XSVMJUBPdaq3XaqNDhnNX0BO3wGt++Wszc4aX+01paQftS ryptGVBEwzjVpZYzmSMSST9tj5Y/y8G9YCx/LJjBPTad3CpD85L+3tBFYuCkzdJzNAaS Hf+a4u9w9YoijHeLK67T15d7L/S5xtpa1SELLMC/4Eb7AfZXg7Msq1FhmVpShWTwN28n 8yW7UXPz3PpjiXyUOeZbWcnRla9Ty6/9b8QUNy+zOlBpCmRR6cCMx/5vNnhiaYX23vCj +7tQ== X-Gm-Message-State: AC+VfDzYCQpBOrAjFqeu2JDQIODXwdTG55VGD9oQamXaKLwjOzU7938c L3+VMVULMymnRusBUCG7gYk/gw== X-Google-Smtp-Source: ACHHUZ4VcJ8uys5Wg+XhQi/AqGcqZN5zPbzkOujNssPmQqlmUArRuZ8YDG3LYugsQYwQAHxQcBQMpA== X-Received: by 2002:a0d:d955:0:b0:55a:ad0a:766 with SMTP id b82-20020a0dd955000000b0055aad0a0766mr17833906ywe.10.1683693830970; Tue, 09 May 2023 21:43:50 -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 p185-20020a0dcdc2000000b0055a72f6a462sm2214413ywd.19.2023.05.09.21.43.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 May 2023 21:43:50 -0700 (PDT) Date: Tue, 9 May 2023 21:43:47 -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 , 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 , 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 02/23] arm64: allow pte_offset_map() to fail In-Reply-To: <77a5d8c-406b-7068-4f17-23b7ac53bc83@google.com> Message-ID: References: <77a5d8c-406b-7068-4f17-23b7ac53bc83@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Precedence: bulk List-ID: X-Mailing-List: linux-parisc@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 --- 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 9e0db5c387e3..a58780d5fac4 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