1 files changed, 49 insertions, 0 deletions

diff --git a/arch/score/include/asm/cmpxchg.h b/arch/score/include/asm/cmpxchg.h
new file mode 100644
index 000000000000..f384839c3ee5
--- /dev/null
+++ b/arch/score/include/asm/cmpxchg.h
@@ -0,0 +1,49 @@
+#ifndef _ASM_SCORE_CMPXCHG_H
+#define _ASM_SCORE_CMPXCHG_H
+
+#include <linux/irqflags.h>
+
+struct __xchg_dummy { unsigned long a[100]; };
+#define __xg(x) ((struct __xchg_dummy *)(x))
+
+static inline
+unsigned long __xchg(volatile unsigned long *m, unsigned long val)
+{
+        unsigned long retval;
+        unsigned long flags;
+
+        local_irq_save(flags);
+        retval = *m;
+        *m = val;
+        local_irq_restore(flags);
+        return retval;
+}
+
+#define xchg(ptr, v)                                            \
+        ((__typeof__(*(ptr))) __xchg((unsigned long *)(ptr),    \
+                                        (unsigned long)(v)))
+
+static inline unsigned long __cmpxchg(volatile unsigned long *m,
+                                unsigned long old, unsigned long new)
+{
+        unsigned long retval;
+        unsigned long flags;
+
+        local_irq_save(flags);
+        retval = *m;
+        if (retval == old)
+                *m = new;
+        local_irq_restore(flags);
+        return retval;
+}
+
+#define cmpxchg(ptr, o, n)                                      \
+        ((__typeof__(*(ptr))) __cmpxchg((unsigned long *)(ptr), \
+                                        (unsigned long)(o),     \
+                                        (unsigned long)(n)))
+
+#define __HAVE_ARCH_CMPXCHG     1
+
+#include <asm-generic/cmpxchg-local.h>
+
+#endif /* _ASM_SCORE_CMPXCHG_H */