ACPI-Convert-c3_lock-to-raw_spinlock.patch

From b4e03db2f4b2318144b917786cdee81575cf525c Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Sat, 25 Jul 2009 18:14:37 +0200
Subject: [PATCH] ACPI: Convert c3_lock to raw_spinlock

commit 50fee3b3ad7cd773f0b50739bb0ed9ac43561c7d in tip.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index cc978a8..3e047b8 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -927,7 +927,7 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev,
 }
 
 static int c3_cpu_count;
-static DEFINE_SPINLOCK(c3_lock);
+static DEFINE_RAW_SPINLOCK(c3_lock);
 
 /**
  * acpi_idle_enter_bm - enters C3 with proper BM handling
@@ -1004,12 +1004,12 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
 	 * without doing anything.
 	 */
 	if (pr->flags.bm_check && pr->flags.bm_control) {
-		spin_lock(&c3_lock);
+		raw_spin_lock(&c3_lock);
 		c3_cpu_count++;
 		/* Disable bus master arbitration when all CPUs are in C3 */
 		if (c3_cpu_count == num_online_cpus())
 			acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 1);
-		spin_unlock(&c3_lock);
+		raw_spin_unlock(&c3_lock);
 	} else if (!pr->flags.bm_check) {
 		ACPI_FLUSH_CPU_CACHE();
 	}
@@ -1018,10 +1018,10 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
 
 	/* Re-enable bus master arbitration */
 	if (pr->flags.bm_check && pr->flags.bm_control) {
-		spin_lock(&c3_lock);
+		raw_spin_lock(&c3_lock);
 		acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 0);
 		c3_cpu_count--;
-		spin_unlock(&c3_lock);
+		raw_spin_unlock(&c3_lock);
 	}
 	kt2 = ktime_get_real();
 	idle_time =  ktime_to_us(ktime_sub(kt2, kt1));
-- 
1.7.1.1