[PATCH] ppc64: limit segment tables on UP kernels

We were allocating 48 segment tables on UP kernels.  Remove them and save
192kB of kernel memory on UP builds.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/ppc64/kernel/head.S

@@ -2145,10 +2145,12 @@ swapper_pg_dir:
 ioremap_dir:
 	.space	4096
 
+#ifdef CONFIG_SMP
 /* 1 page segment table per cpu (max 48, cpu0 allocated at STAB0_PHYS_ADDR) */
 	.globl	stab_array
 stab_array:
 	.space	4096 * 48
+#endif
 	
 /*
  * This space gets a copy of optional info passed to us by the bootstrap