[PATCH] PPC64 can do preempt debug too

This patch enables the DEBUG_PREEMPT config option for PPC64.  I have
this turned on on my desktop G5 and it isn't finding any problems.
(It did find one problem, in flush_tlb_pending(), that I have just
sent a patch for.)

BTW, do we really need to restrict which architectures the config
option is available on?
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/asm-ppc64/smp.h

@@ -38,7 +38,7 @@ struct pt_regs;
 extern void smp_message_recv(int, struct pt_regs *);
 
 
-#define smp_processor_id() (get_paca()->paca_index)
+#define __smp_processor_id() (get_paca()->paca_index)
 #define hard_smp_processor_id() (get_paca()->hw_cpu_id)
 
 extern cpumask_t cpu_sibling_map[NR_CPUS];

lib/Kconfig.debug

@@ -50,7 +50,7 @@ config DEBUG_SLAB
 
 config DEBUG_PREEMPT
 	bool "Debug preemptible kernel"
-	depends on PREEMPT && X86
+	depends on PREEMPT && (X86 || PPC64)
 	default y
 	help
 	  If you say Y here then the kernel will use a debug variant of the