ppc64/powerpc: Fix time initialization on SMP systems

This moves smp_space_timers from arch/ppc64/kernel/smp.c to
arch/powerpc/kernel/time.c and makes it initialize last_jiffy[]
instead of paca[].next_jiffy_update_tb, since last_jiffy[] is
now what the time code uses.  It also declares smp_space_timers
in include/asm-powerpc/time.h and gets rid of an ifdef in
div128_by_32.
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/powerpc/kernel/time.c

@@ -458,7 +458,7 @@ void wakeup_decrementer(void)
 		per_cpu(last_jiffy, i) = tb_last_stamp;
 }
 
-#ifdef CONFIG_SMPxxx
+#ifdef CONFIG_SMP
 void __init smp_space_timers(unsigned int max_cpus)
 {
 	int i;
@@ -948,16 +948,6 @@ void div128_by_32(u64 dividend_high, u64 dividend_low,
 	w = a / divisor;
 	ra = ((u64)(a - (w * divisor)) << 32) + b;
 
-#ifdef CONFIG_PPC64
-	x = ra / divisor;
-	rb = ((ra - (x * divisor)) << 32) + c;
-
-	y = rb / divisor;
-	rc = ((rb - (y * divisor)) << 32) + d;
-
-	z = rc / divisor;
-#else
-	/* for 32-bit, use do_div from div64.h */
 	rb = ((u64) do_div(ra, divisor) << 32) + c;
 	x = ra;
 
@@ -966,10 +956,8 @@ void div128_by_32(u64 dividend_high, u64 dividend_low,
 
 	do_div(rc, divisor);
 	z = rc;
-#endif
 
 	dr->result_high = ((u64)w << 32) + x;
 	dr->result_low  = ((u64)y << 32) + z;
 
 }
-

arch/ppc64/kernel/smp.c

@@ -105,21 +105,6 @@ void __devinit smp_generic_kick_cpu(int nr)
 
 #endif /* CONFIG_MPIC */
 
-static void __init smp_space_timers(unsigned int max_cpus)
-{
-	int i;
-	unsigned long offset = tb_ticks_per_jiffy / max_cpus;
-	unsigned long previous_tb = paca[boot_cpuid].next_jiffy_update_tb;
-
-	for_each_cpu(i) {
-		if (i != boot_cpuid) {
-			paca[i].next_jiffy_update_tb =
-				previous_tb + offset;
-			previous_tb = paca[i].next_jiffy_update_tb;
-		}
-	}
-}
-
 void smp_message_recv(int msg, struct pt_regs *regs)
 {
 	switch(msg) {

include/asm-powerpc/time.h

@@ -196,8 +196,10 @@ static inline unsigned long tb_ticks_since(unsigned long tstamp)
 extern u64 mulhdu(u64, u64);
 #endif
 
-unsigned mulhwu_scale_factor(unsigned, unsigned);
-void div128_by_32(u64 dividend_high, u64 dividend_low,
+extern void smp_space_timers(unsigned int);
+
+extern unsigned mulhwu_scale_factor(unsigned, unsigned);
+extern void div128_by_32(u64 dividend_high, u64 dividend_low,
 			 unsigned divisor, struct div_result *dr);
 
 /* Used to store Processor Utilization register (purr) values */