linux-kernel - [RFC 6/6] acpi: Use built-in RCU list checking for acpi

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Message-Id: <20190601222738.6856-7-joel@joelfernandes.org>
Date:   Sat,  1 Jun 2019 18:27:38 -0400
From:   "Joel Fernandes (Google)" <joel@...lfernandes.org>
To:     linux-kernel@...r.kernel.org
Cc:     "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Borislav Petkov <bp@...en8.de>,
        "David S. Miller" <davem@...emloft.net>, edumazet@...gle.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Josh Triplett <josh@...htriplett.org>, keescook@...omium.org,
        kernel-hardening@...ts.openwall.com,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-pm@...r.kernel.org,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        neilb@...e.com, netdev@...r.kernel.org, oleg@...hat.com,
        "Paul E. McKenney" <paulmck@...ux.ibm.com>,
        Pavel Machek <pavel@....cz>, peterz@...radead.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>, rcu@...r.kernel.org,
        Steven Rostedt <rostedt@...dmis.org>,
        Tejun Heo <tj@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        x86@...nel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT))
Subject: [RFC 6/6] acpi: Use built-in RCU list checking for acpi_ioremaps list

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) <joel@...lfernandes.org>
---
 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 f29e427d0d1d..c8b5d712c7ae 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -28,6 +28,7 @@
 #include <linux/slab.h>
 #include <linux/mm.h>
 #include <linux/highmem.h>
+#include <linux/lockdep.h>
 #include <linux/pci.h>
 #include <linux/interrupt.h>
 #include <linux/kmod.h>
@@ -94,6 +95,7 @@ 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)
@@ -220,7 +222,7 @@ 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;
@@ -263,7 +265,7 @@ 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.rc1.311.g5d7573a151-goog