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Commit eb9b5141 authored by Tim Anderson's avatar Tim Anderson Committed by Ralf Baechle
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MIPS: CMP: Update sync-r4k for current kernel 



This revises the sync-4k so it will boot and operate since the removal of
expirelo from the timer code.

Signed-off-by: default avatarTim Anderson <tanderson@mvista.com>
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 47b178bb

arch/mips/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -1656,7 +1656,7 @@ config MIPS_APSP_KSPD 
config MIPS_CMP

	bool "MIPS CMP framework support"

	depends on SYS_SUPPORTS_MIPS_CMP

	select SYNC_R4K if BROKEN

	select SYNC_R4K

	select SYS_SUPPORTS_SMP

	select SYS_SUPPORTS_SCHED_SMT if SMP

	select WEAK_ORDERING

arch/mips/kernel/sync-r4k.c

+16 −15
Original line number Diff line number Diff line 
/*

 * Count register synchronisation.

 *

 * All CPUs will have their count registers synchronised to the CPU0 expirelo

 * All CPUs will have their count registers synchronised to the CPU0 next time

 * value. This can cause a small timewarp for CPU0. All other CPU's should

 * not have done anything significant (but they may have had interrupts

 * enabled briefly - prom_smp_finish() should not be responsible for enabling
@@ -13,21 +13,22 @@ 
#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/irqflags.h>

#include <linux/r4k-timer.h>

#include <linux/cpumask.h>



#include <asm/r4k-timer.h>

#include <asm/atomic.h>

#include <asm/barrier.h>

#include <asm/cpumask.h>

#include <asm/mipsregs.h>



static atomic_t __initdata count_start_flag = ATOMIC_INIT(0);

static atomic_t __initdata count_count_start = ATOMIC_INIT(0);

static atomic_t __initdata count_count_stop = ATOMIC_INIT(0);

static atomic_t __cpuinitdata count_start_flag = ATOMIC_INIT(0);

static atomic_t __cpuinitdata count_count_start = ATOMIC_INIT(0);

static atomic_t __cpuinitdata count_count_stop = ATOMIC_INIT(0);

static atomic_t __cpuinitdata count_reference = ATOMIC_INIT(0);



#define COUNTON	100

#define NR_LOOPS 5



void __init synchronise_count_master(void)

void __cpuinit synchronise_count_master(void)

{

	int i;

	unsigned long flags;
@@ -42,7 +43,7 @@ void __init synchronise_count_master(void) 
	return;

#endif



	pr_info("Checking COUNT synchronization across %u CPUs: ",

	printk(KERN_INFO "Synchronize counters across %u CPUs: ",

	       num_online_cpus());



	local_irq_save(flags);
@@ -50,11 +51,12 @@ void __init synchronise_count_master(void) 
	/*

	 * Notify the slaves that it's time to start

	 */

	atomic_set(&count_reference, read_c0_count());

	atomic_set(&count_start_flag, 1);

	smp_wmb();



	/* Count will be initialised to expirelo for all CPU's */

	initcount = expirelo;

	/* Count will be initialised to current timer for all CPU's */

	initcount = read_c0_count();



	/*

	 * We loop a few times to get a primed instruction cache,
@@ -106,7 +108,7 @@ void __init synchronise_count_master(void) 
	printk("done.\n");

}



void __init synchronise_count_slave(void)

void __cpuinit synchronise_count_slave(void)

{

	int i;

	unsigned long flags;
@@ -131,8 +133,8 @@ void __init synchronise_count_slave(void) 
	while (!atomic_read(&count_start_flag))

		mb();



	/* Count will be initialised to expirelo for all CPU's */

	initcount = expirelo;

	/* Count will be initialised to next expire for all CPU's */

	initcount = atomic_read(&count_reference);



	ncpus = num_online_cpus();

	for (i = 0; i < NR_LOOPS; i++) {
@@ -156,4 +158,3 @@ void __init synchronise_count_slave(void) 
	local_irq_restore(flags);

}

#undef NR_LOOPS
 
#endif