generic, x86: fix __per_cpu_load relocation

This patch fixes this linker error:

 WARNING: Absolute relocations present
 Offset     Info     Type     Sym.Value Sym.Name
 c0a4e07d 00e78001   R_386_32 c0ab0000  __per_cpu_load

Now, __per_cpu_load is a section-relative symbol:

 c0aa4000 D __per_cpu_load
 c0aa4000 A __per_cpu_load_abs
Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

include/asm-generic/vmlinux.lds.h

@@ -451,17 +451,18 @@
  * end offset.
  */
 #define PERCPU_VADDR(vaddr, phdr)					\
-	VMLINUX_SYMBOL(__per_cpu_load) = .;				\
-	.data.percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load)		\
+	VMLINUX_SYMBOL(__per_cpu_load_abs) = .;				\
+	.data.percpu vaddr : AT(VMLINUX_SYMBOL(__per_cpu_load_abs)	\
 				- LOAD_OFFSET) {			\
 		VMLINUX_SYMBOL(__per_cpu_start) = .;			\
+		VMLINUX_SYMBOL(__per_cpu_load) = LOADADDR(.data.percpu) + LOAD_OFFSET;\
 		*(.data.percpu.first)					\
 		*(.data.percpu.page_aligned)				\
 		*(.data.percpu)						\
 		*(.data.percpu.shared_aligned)				\
 		VMLINUX_SYMBOL(__per_cpu_end) = .;			\
 	} phdr								\
-	. = VMLINUX_SYMBOL(__per_cpu_load) + SIZEOF(.data.percpu);
+	. = VMLINUX_SYMBOL(__per_cpu_load_abs) + SIZEOF(.data.percpu);
 
 /**
  * PERCPU - define output section for percpu area, simple version