dma_spin_lock needs to be a real spinlock on preempt-rt. Convert it to
a raw_spinlock. No change for !RT kernels.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 arch/arm/include/asm/dma.h |    6 +++---
 arch/arm/kernel/dma.c      |    2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

Index: linux-2.6-tip/arch/arm/include/asm/dma.h
===================================================================
--- linux-2.6-tip.orig/arch/arm/include/asm/dma.h
+++ linux-2.6-tip/arch/arm/include/asm/dma.h
@@ -31,18 +31,18 @@
 #define DMA_MODE_CASCADE 0xc0
 #define DMA_AUTOINIT	 0x10
 
-extern spinlock_t  dma_spin_lock;
+extern raw_spinlock_t  dma_spin_lock;
 
 static inline unsigned long claim_dma_lock(void)
 {
 	unsigned long flags;
-	spin_lock_irqsave(&dma_spin_lock, flags);
+	raw_spin_lock_irqsave(&dma_spin_lock, flags);
 	return flags;
 }
 
 static inline void release_dma_lock(unsigned long flags)
 {
-	spin_unlock_irqrestore(&dma_spin_lock, flags);
+	raw_spin_unlock_irqrestore(&dma_spin_lock, flags);
 }
 
 /* Clear the 'DMA Pointer Flip Flop'.
Index: linux-2.6-tip/arch/arm/kernel/dma.c
===================================================================
--- linux-2.6-tip.orig/arch/arm/kernel/dma.c
+++ linux-2.6-tip/arch/arm/kernel/dma.c
@@ -21,7 +21,7 @@
 
 #include <asm/mach/dma.h>
 
-DEFINE_SPINLOCK(dma_spin_lock);
+DEFINE_RAW_SPINLOCK(dma_spin_lock);
 EXPORT_SYMBOL(dma_spin_lock);
 
 static dma_t *dma_chan[MAX_DMA_CHANNELS];