powerpc.git broken for ARCH=ppc

[Kumar Gala]

Ben,

It looks like you broke ARCH=ppc builds:

arch/ppc/kernel/time.c: In function `wakeup_decrementer':
arch/ppc/kernel/time.c:125: warning: implicit declaration of function  
`last_jiffy_stamp'
arch/ppc/kernel/time.c:125: error: invalid lvalue in assignment
arch/ppc/kernel/time.c: In function `timer_interrupt':
arch/ppc/kernel/time.c:189: error: invalid lvalue in assignment
arch/ppc/kernel/time.c: In function `time_init':
arch/ppc/kernel/time.c:331: error: invalid lvalue in assignment

In asm-powerpc/hardirq.h you removed the defn of last_jiffy_stamp.   
Suggestions on what the right fix is for arch=ppc?

- kumar