linux-kernel - [PATCH 09/26] x86: Convert set_atomicity_lock to raw

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Date:	Mon, 11 Jan 2010 22:26:39 +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 09/26] x86: Convert set_atomicity_lock to raw_spinlock

Convert locks which cannot sleep in preempt-rt to raw_spinlocks

See also 11f7e656720b244c062223529e9a8aafeb8d6076

Signed-off-by: John Kacur <jkacur@...hat.com>
---
 arch/x86/kernel/cpu/mtrr/generic.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/mtrr/generic.c b/arch/x86/kernel/cpu/mtrr/generic.c
index 55da0c5..46f40f0 100644
--- a/arch/x86/kernel/cpu/mtrr/generic.c
+++ b/arch/x86/kernel/cpu/mtrr/generic.c
@@ -570,7 +570,7 @@ static unsigned long set_mtrr_state(void)
 
 
 static unsigned long cr4;
-static DEFINE_SPINLOCK(set_atomicity_lock);
+static DEFINE_RAW_SPINLOCK(set_atomicity_lock);
 
 /*
  * Since we are disabling the cache don't allow any interrupts,
@@ -590,7 +590,7 @@ static void prepare_set(void) __acquires(set_atomicity_lock)
 	 * changes to the way the kernel boots
 	 */
 
-	spin_lock(&set_atomicity_lock);
+	raw_spin_lock(&set_atomicity_lock);
 
 	/* Enter the no-fill (CD=1, NW=0) cache mode and flush caches. */
 	cr0 = read_cr0() | X86_CR0_CD;
@@ -627,7 +627,7 @@ static void post_set(void) __releases(set_atomicity_lock)
 	/* Restore value of CR4 */
 	if (cpu_has_pge)
 		write_cr4(cr4);
-	spin_unlock(&set_atomicity_lock);
+	raw_spin_unlock(&set_atomicity_lock);
 }
 
 static void generic_set_all(void)
-- 
1.6.5.2

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