sparc64/kernel/semaphore.c needs errno.h

add forward decl of struct page to asm-sparc64/pgtable.h

arch/sparc64/kernel/semaphore.c

@@ -7,6 +7,7 @@
  */
 
 #include <linux/sched.h>
+#include <linux/errno.h>
 
 /*
  * Atomically update sem->count.

include/asm-sparc64/pgtable.h

@@ -48,6 +48,8 @@ extern void flush_cache_range(struct vm_area_struct *, unsigned long, unsigned l
 	flush_cache_mm((vma)->vm_mm)
 
 
+struct page;
+
 /* 
  * On spitfire, the icache doesn't snoop local stores and we don't
  * use block commit stores (which invalidate icache lines) during