linux-kernel - [PATCH 10/26] ACPI: Convert c3_lock to raw

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Date:	Mon, 11 Jan 2010 22:26:40 +0100
From:	John Kacur <jkacur@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	lkml <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Cc:	Clark Williams <williams@...hat.com>,
	John Kacur <jkacur@...hat.com>
Subject: [PATCH 10/26] ACPI: Convert c3_lock to raw_spinlock

Convert locks which cannot sleep under preempt-rt to raw_spinlocks

See also 50fee3b3ad7cd773f0b50739bb0ed9ac43561c7d

Signed-off-by: John Kacur <jkacur@...hat.com>
---
 drivers/acpi/processor_idle.c |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index d1676b1..42b30d0 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -929,7 +929,7 @@ 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));
-- 
1.6.5.2

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