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=-8.2 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_SANE_1 autolearn=ham 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 CA5F9C7618F for ; Tue, 16 Jul 2019 18:44:26 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id 3534C2173C for ; Tue, 16 Jul 2019 18:44:25 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3534C2173C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.ibm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernel-hardening-return-16484-kernel-hardening=archiver.kernel.org@lists.openwall.com Received: (qmail 21508 invoked by uid 550); 16 Jul 2019 18:44:20 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Received: (qmail 20461 invoked from network); 16 Jul 2019 18:44:19 -0000 Date: Tue, 16 Jul 2019 11:43:31 -0700 From: "Paul E. McKenney" To: "Joel Fernandes (Google)" Cc: linux-kernel@vger.kernel.org, Alexey Kuznetsov , Bjorn Helgaas , Borislav Petkov , c0d1n61at3@gmail.com, "David S. Miller" , edumazet@google.com, Greg Kroah-Hartman , Hideaki YOSHIFUJI , "H. Peter Anvin" , Ingo Molnar , Jonathan Corbet , Josh Triplett , keescook@chromium.org, kernel-hardening@lists.openwall.com, kernel-team@android.com, Lai Jiangshan , Len Brown , linux-acpi@vger.kernel.org, linux-doc@vger.kernel.org, linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, Mathieu Desnoyers , neilb@suse.com, netdev@vger.kernel.org, Oleg Nesterov , Pavel Machek , peterz@infradead.org, "Rafael J. Wysocki" , Rasmus Villemoes , rcu@vger.kernel.org, Steven Rostedt , Tejun Heo , Thomas Gleixner , will@kernel.org, "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" Subject: Re: [PATCH 8/9] acpi: Use built-in RCU list checking for acpi_ioremaps list (v1) Message-ID: <20190716184331.GJ14271@linux.ibm.com> References: <20190715143705.117908-1-joel@joelfernandes.org> <20190715143705.117908-9-joel@joelfernandes.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190715143705.117908-9-joel@joelfernandes.org> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-07-16_04:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907160229 On Mon, Jul 15, 2019 at 10:37:04AM -0400, Joel Fernandes (Google) wrote: > list_for_each_entry_rcu has built-in RCU and lock checking. Make use of > it for acpi_ioremaps list traversal. > > Signed-off-by: Joel Fernandes (Google) Given that Rafael acked it, this one looks ready. Thanx, Paul > --- > drivers/acpi/osl.c | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c > index 9c0edf2fc0dd..2f9d0d20b836 100644 > --- a/drivers/acpi/osl.c > +++ b/drivers/acpi/osl.c > @@ -14,6 +14,7 @@ > #include > #include > #include > +#include > #include > #include > #include > @@ -80,6 +81,7 @@ struct acpi_ioremap { > > static LIST_HEAD(acpi_ioremaps); > static DEFINE_MUTEX(acpi_ioremap_lock); > +#define acpi_ioremap_lock_held() lock_is_held(&acpi_ioremap_lock.dep_map) > > static void __init acpi_request_region (struct acpi_generic_address *gas, > unsigned int length, char *desc) > @@ -206,7 +208,7 @@ acpi_map_lookup(acpi_physical_address phys, acpi_size size) > { > struct acpi_ioremap *map; > > - list_for_each_entry_rcu(map, &acpi_ioremaps, list) > + list_for_each_entry_rcu(map, &acpi_ioremaps, list, acpi_ioremap_lock_held()) > if (map->phys <= phys && > phys + size <= map->phys + map->size) > return map; > @@ -249,7 +251,7 @@ acpi_map_lookup_virt(void __iomem *virt, acpi_size size) > { > struct acpi_ioremap *map; > > - list_for_each_entry_rcu(map, &acpi_ioremaps, list) > + list_for_each_entry_rcu(map, &acpi_ioremaps, list, acpi_ioremap_lock_held()) > if (map->virt <= virt && > virt + size <= map->virt + map->size) > return map; > -- > 2.22.0.510.g264f2c817a-goog >