From patchwork Thu Jun 8 19:11:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hugh Dickins X-Patchwork-Id: 13272708 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 92F4EC7EE29 for ; Thu, 8 Jun 2023 19:12:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:Message-ID: In-Reply-To:Subject:cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=tJiTabZzGRUA+JuYDmW3B68WKUmw6zY9V7jyqkobjXs=; b=WzNSw2ORxAGRqC r9u+BIFMNGil9Y0GsVlMiFXTyZoAtHYeqQcHkg/FCVuaoFf9u0hDCnA+44WZmO4xWD9TDpMwwCnC4 h5pSxuCKGZiiSP7TcXC/LvaVrx0mi8rFMOFXgS9Mo1iaq7rgv/Wrd/M6GoUNSP1IAj/sTXibNHlb9 W39rFAruWIMk4J71CZA21gF2YsdiDHk6TxANqX7PKKeJmKdiErnHNikm+4I3mMGYiAwS0C17Awjx7 WFXwgoc4cbqxGMRaN/ljzT9jpPOnJua5cHM+bgRv2jxynpqnjFXDSa+e+TJBHP7NUEv+7h9AFBlki RG4cYzI0bjq8zETNcjPg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1q7L3I-00AHET-1i; Thu, 08 Jun 2023 19:12:08 +0000 Received: from mail-yw1-x1134.google.com ([2607:f8b0:4864:20::1134]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1q7L3G-00AHBR-08 for linux-arm-kernel@lists.infradead.org; Thu, 08 Jun 2023 19:12:07 +0000 Received: by mail-yw1-x1134.google.com with SMTP id 00721157ae682-569386b7861so31148547b3.0 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=hFvkYIAtIkd0goaqBFSXrMmc9eEzWrXLBILNQf+QeMDSoKO6skPpt/HF9j5hjN7EoF ndcSUtj7nNhYQDsQtmu9+/1PoyC4fgd06tbooubiHpgy42HZNe16sfJVJR/j7wzZLudQ dtzwsmhVksQxku9aoxJADQWyc9s7kuKCvuijiaz6XnEoJUzDj9+Y05i856CT/WUdxMqB msjEIcvLUkiVy5CBHD61CsdEQrK2dizPmrt/FNn6qWKxRLlMRNqK/6libLq22lY+Jaoo Fp/0NsS3AEAhkmr+sG4mNImTZg9BohdA7x57kZqGVmNfIcP8u1fhGjizmzVnpBunE1m7 coCg== X-Gm-Message-State: AC+VfDwh3q/D35J9nxpkMpXjGFv0wk0BEEwJSTXkochgQwuaFbRPG1ee 2GbHk8dV4/Id+T/bVDtaOLBTTg== 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230608_121206_094516_550B66DB X-CRM114-Status: GOOD ( 12.90 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.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);