sparc64: Export flush_ptrace_access() (needed by lustre)

ERROR: "flush_ptrace_access" [drivers/staging/lustre/lustre/libcfs/libcfs.ko]
undefined!
Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

arch/sparc/kernel/ptrace_64.c

@@ -14,6 +14,7 @@
 #include <linux/sched.h>
 #include <linux/mm.h>
 #include <linux/errno.h>
+#include <linux/export.h>
 #include <linux/ptrace.h>
 #include <linux/user.h>
 #include <linux/smp.h>
@@ -116,6 +117,7 @@ void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
 
 	preempt_enable();
 }
+EXPORT_SYMBOL_GPL(flush_ptrace_access);
 
 static int get_from_target(struct task_struct *target, unsigned long uaddr,
 			   void *kbuf, int len)