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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
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