Commit a5b518ed authored by Paul Mackerras's avatar Paul Mackerras
Browse files

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: default avatarPaul Mackerras <paulus@samba.org>
parent e2b55306

arch/powerpc/kernel/time.c

+1 −13
Original line number Diff line number Diff line
@@ -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

+0 −15
Original line number Diff line number Diff line
@@ -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

+5 −3
Original line number Diff line number Diff line
@@ -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 */

CRA Git | Maintained and supported by SUSTech CRA and CCSE