Fix compile failure with non modular builds

Commit deac93df26 ("lib: Correct printk
%pF to work on all architectures") broke the non modular builds by
moving an essential function into modules.c.  Fix this by moving it
out again and into asm/sections.h as an inline.  To do this, the
definition of struct ppc64_opd_entry has been lifted out of modules.c
and put in asm/elf.h where it belongs.

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/include/asm/sections.h

@@ -2,6 +2,8 @@
 #define _ASM_POWERPC_SECTIONS_H
 #ifdef __KERNEL__
 
+#include <linux/elf.h>
+#include <linux/uaccess.h>
 #include <asm-generic/sections.h>
 
 #ifdef __powerpc64__
@@ -17,7 +19,15 @@ static inline int in_kernel_text(unsigned long addr)
 }
 
 #undef dereference_function_descriptor
-void *dereference_function_descriptor(void *);
+static inline void *dereference_function_descriptor(void *ptr)
+{
+	struct ppc64_opd_entry *desc = ptr;
+	void *p;
+
+	if (!probe_kernel_address(&desc->funcaddr, p))
+		ptr = p;
+	return ptr;
+}
 
 #endif