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Diffstat (limited to 'kernel/arch/sh/include/asm/cmpxchg-irq.h')
-rw-r--r--kernel/arch/sh/include/asm/cmpxchg-irq.h42
1 files changed, 42 insertions, 0 deletions
diff --git a/kernel/arch/sh/include/asm/cmpxchg-irq.h b/kernel/arch/sh/include/asm/cmpxchg-irq.h
new file mode 100644
index 000000000..bd11f6304
--- /dev/null
+++ b/kernel/arch/sh/include/asm/cmpxchg-irq.h
@@ -0,0 +1,42 @@
+#ifndef __ASM_SH_CMPXCHG_IRQ_H
+#define __ASM_SH_CMPXCHG_IRQ_H
+
+#include <linux/irqflags.h>
+
+static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
+{
+ unsigned long flags, retval;
+
+ local_irq_save(flags);
+ retval = *m;
+ *m = val;
+ local_irq_restore(flags);
+ return retval;
+}
+
+static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
+{
+ unsigned long flags, retval;
+
+ local_irq_save(flags);
+ retval = *m;
+ *m = val & 0xff;
+ local_irq_restore(flags);
+ return retval;
+}
+
+static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
+ unsigned long new)
+{
+ __u32 retval;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ retval = *m;
+ if (retval == old)
+ *m = new;
+ local_irq_restore(flags); /* implies memory barrier */
+ return retval;
+}
+
+#endif /* __ASM_SH_CMPXCHG_IRQ_H */