Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / metag / include / asm / cmpxchg_lock1.h

diff --git a/kernel/arch/metag/include/asm/cmpxchg_lock1.h b/kernel/arch/metag/include/asm/cmpxchg_lock1.h
new file mode 100644 (file)
index 0000000..fd68504
--- /dev/null
+++ b/kernel/arch/metag/include/asm/cmpxchg_lock1.h
@@ -0,0 +1,48 @@
+#ifndef __ASM_METAG_CMPXCHG_LOCK1_H
+#define __ASM_METAG_CMPXCHG_LOCK1_H
+
+#include <asm/global_lock.h>
+
+/* Use LOCK2 as these have to be atomic w.r.t. ordinary accesses. */
+
+static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
+{
+       unsigned long flags, retval;
+
+       __global_lock2(flags);
+       fence();
+       retval = *m;
+       *m = val;
+       __global_unlock2(flags);
+       return retval;
+}
+
+static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
+{
+       unsigned long flags, retval;
+
+       __global_lock2(flags);
+       fence();
+       retval = *m;
+       *m = val & 0xff;
+       __global_unlock2(flags);
+       return retval;
+}
+
+static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
+                                         unsigned long new)
+{
+       __u32 retval;
+       unsigned long flags;
+
+       __global_lock2(flags);
+       retval = *m;
+       if (retval == old) {
+               fence();
+               *m = new;
+       }
+       __global_unlock2(flags);
+       return retval;
+}
+
+#endif /* __ASM_METAG_CMPXCHG_LOCK1_H */