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From: "Rafael J. Wysocki" <rafael@kernel.org>
To: "Joel Fernandes (Google)" <joel@joelfernandes.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Borislav Petkov <bp@alien8.de>,
	c0d1n61at3@gmail.com, "David S. Miller" <davem@davemloft.net>,
	edumazet@google.com,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
	"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
	Jonathan Corbet <corbet@lwn.net>,
	Josh Triplett <josh@joshtriplett.org>,
	Kees Cook <keescook@chromium.org>,
	Kernel Hardening <kernel-hardening@lists.openwall.com>,
	"Cc: Android Kernel" <kernel-team@android.com>,
	Lai Jiangshan <jiangshanlai@gmail.com>,
	Len Brown <lenb@kernel.org>,
	ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
	"open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
	Linux PCI <linux-pci@vger.kernel.org>,
	Linux PM <linux-pm@vger.kernel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	NeilBrown <neilb@suse.com>, netdev <netdev@vger.kernel.org>,
	Oleg Nesterov <oleg@redhat.com>,
	"Paul E. McKenney" <paulmck@linux.ibm.com>,
	Pavel Machek <pavel@ucw.cz>,
	Peter Zijlstra <peterz@infradead.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Rasmus Villemoes <rasmus.villemoes@prevas.dk>,
	rcu@vger.kernel.org, Steven Rostedt <rostedt@goodmis.org>,
	Tejun Heo <tj@kernel.org>, Thomas Gleixner <tglx@linutronix.de>,
	Will Deacon <will@kernel.org>,
	"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
	<x86@kernel.org>
Subject: Re: [PATCH 8/9] acpi: Use built-in RCU list checking for acpi_ioremaps list (v1)
Date: Mon, 15 Jul 2019 23:44:31 +0200	[thread overview]
Message-ID: <CAJZ5v0jdx1dgBZLyH_Loj1XVuLCV+HMHjk8r_n8xG7qmoH_z3A@mail.gmail.com> (raw)
In-Reply-To: <20190715143705.117908-9-joel@joelfernandes.org>

On Mon, Jul 15, 2019 at 4:43 PM Joel Fernandes (Google)
<joel@joelfernandes.org> 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) <joel@joelfernandes.org>

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

> ---
>  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 <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>
> @@ -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
>

  reply	other threads:[~2019-07-15 21:44 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-15 14:36 [PATCH 0/9] Harden list_for_each_entry_rcu() and family Joel Fernandes (Google)
2019-07-15 14:36 ` [PATCH 1/9] rcu/update: Remove useless check for debug_locks (v1) Joel Fernandes (Google)
2019-07-15 14:36 ` [PATCH 2/9] rcu: Add support for consolidated-RCU reader checking (v3) Joel Fernandes (Google)
2019-07-16 18:38   ` Paul E. McKenney
2019-07-16 18:46     ` Joel Fernandes
2019-07-16 18:53       ` Paul E. McKenney
2019-07-16 22:02         ` Joel Fernandes
2019-07-17  0:07           ` Paul E. McKenney
2019-07-15 14:36 ` [PATCH 3/9] rcu/sync: Remove custom check for reader-section (v2) Joel Fernandes (Google)
2019-07-16 18:39   ` Paul E. McKenney
2019-07-15 14:37 ` [PATCH 4/9] ipv4: add lockdep condition to fix for_each_entry (v1) Joel Fernandes (Google)
2019-07-16 18:39   ` Paul E. McKenney
2019-07-16 21:12     ` David Miller
2019-07-15 14:37 ` [PATCH 5/9] driver/core: Convert to use built-in RCU list checking (v1) Joel Fernandes (Google)
2019-07-16 18:40   ` Paul E. McKenney
2019-07-15 14:37 ` [PATCH 6/9] workqueue: Convert for_each_wq to use built-in list check (v2) Joel Fernandes (Google)
2019-07-16 18:41   ` Paul E. McKenney
2019-07-15 14:37 ` [PATCH 7/9] x86/pci: Pass lockdep condition to pcm_mmcfg_list iterator (v1) Joel Fernandes (Google)
2019-07-15 20:02   ` Bjorn Helgaas
2019-07-16  4:03     ` Joel Fernandes
2019-07-16 18:42       ` Paul E. McKenney
2019-07-15 14:37 ` [PATCH 8/9] acpi: Use built-in RCU list checking for acpi_ioremaps list (v1) Joel Fernandes (Google)
2019-07-15 21:44   ` Rafael J. Wysocki [this message]
2019-07-16 18:43   ` Paul E. McKenney
2019-07-15 14:37 ` [PATCH 9/9] doc: Update documentation about list_for_each_entry_rcu (v1) Joel Fernandes (Google)
2019-07-16 18:46 ` [PATCH 0/9] Harden list_for_each_entry_rcu() and family Paul E. McKenney

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