[PATCH] powerpc: Merge current.h

This patch merges current.h.  This is a one-big-ifdef merge, but both
versions are so tiny, I think we can live with it.  While we're at it,
we get rid of the fairly pointless redirection through get_current()
in the ppc64 version.

Built and booted on POWER5 LPAR (ARCH=powerpc & ARCH=ppc64).  Built
for 32-bit pmac (ARCH=powerpc & ARCH=ppc).
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

include/asm-ppc64/current.h → include/asm-powerpc/current.h

-#ifndef _PPC64_CURRENT_H
-#define _PPC64_CURRENT_H
-
-#include <asm/paca.h>
+#ifndef _ASM_POWERPC_CURRENT_H
+#define _ASM_POWERPC_CURRENT_H
 
 /*
  * This program is free software; you can redistribute it and/or
@@ -10,7 +8,20 @@
  * 2 of the License, or (at your option) any later version.
  */
 
-#define get_current()   (get_paca()->__current)
-#define current         get_current()
+struct task_struct;
+
+#ifdef __powerpc64__
+#include <asm/paca.h>
+
+#define current		(get_paca()->__current)
+
+#else
+
+/*
+ * We keep `current' in r2 for speed.
+ */
+register struct task_struct *current asm ("r2");
+
+#endif
 
-#endif /* !(_PPC64_CURRENT_H) */
+#endif /* _ASM_POWERPC_CURRENT_H */

include/asm-ppc/current.h

-#ifdef __KERNEL__
-#ifndef _PPC_CURRENT_H
-#define _PPC_CURRENT_H
-
-/*
- * We keep `current' in r2 for speed.
- */
-register struct task_struct *current asm ("r2");
-
-#endif /* !(_PPC_CURRENT_H) */
-#endif /* __KERNEL__ */