The rearrangements in 
945feb174b14e7098cc7ecf0cf4768d35bc52f9c
("[POWERPC] irqtrace support for 64-bit powerpc") caused 64-bit
non-SMP configs to fail to compile with a message about
local_irq_save being undefined in include/linux/proportions.h.
This follows the lead of x86 in including <linux/irqflags.h> in
asm/system.h, which fixes the problem.
Signed-off-by: Paul Mackerras <paulus@samba.org>
 #define _ASM_POWERPC_SYSTEM_H
 
 #include <linux/kernel.h>
+#include <linux/irqflags.h>
 
 #include <asm/hw_irq.h>