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Message-Id: <20190711234401.220336-7-joel@joelfernandes.org> Date: Thu, 11 Jul 2019 19:44:01 -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>, c0d1n61at3@...il.com, "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>, Rasmus Villemoes <rasmus.villemoes@...vas.dk>, rcu@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>, Tejun Heo <tj@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, will@...nel.org, x86@...nel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)) Subject: [PATCH v1 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; -- 2.22.0.410.gd8fdbe21b5-goog
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