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[SPARC64]: dr-cpu unconfigure support.

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Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2007-07-16 03:49:40 -07:00
parent f3c681c028
commit e0204409df
7 changed files with 171 additions and 21 deletions
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21
arch/sparc64/kernel/process.c
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@ -29,6 +29,7 @@
#include <linux/compat.h>
#include <linux/tick.h>
#include <linux/init.h>
#include <linux/cpu.h>
#include <asm/oplib.h>
#include <asm/uaccess.h>
@ -49,7 +50,7 @@
/* #define VERBOSE_SHOWREGS */
static void sparc64_yield(void)
static void sparc64_yield(int cpu)
{
if (tlb_type != hypervisor)
return;
@ -57,7 +58,7 @@ static void sparc64_yield(void)
clear_thread_flag(TIF_POLLING_NRFLAG);
smp_mb__after_clear_bit();
while (!need_resched()) {
while (!need_resched() && !cpu_is_offline(cpu)) {
unsigned long pstate;
/* Disable interrupts. */
@ -68,7 +69,7 @@ static void sparc64_yield(void)
: "=&r" (pstate)
: "i" (PSTATE_IE));
if (!need_resched())
if (!need_resched() && !cpu_is_offline(cpu))
sun4v_cpu_yield();
/* Re-enable interrupts. */
@ -86,15 +87,25 @@ static void sparc64_yield(void)
/* The idle loop on sparc64. */
void cpu_idle(void)
{
int cpu = smp_processor_id();
set_thread_flag(TIF_POLLING_NRFLAG);
while(1) {
tick_nohz_stop_sched_tick();
while (!need_resched())
sparc64_yield();
while (!need_resched() && !cpu_is_offline(cpu))
sparc64_yield(cpu);
tick_nohz_restart_sched_tick();
preempt_enable_no_resched();
#ifdef CONFIG_HOTPLUG_CPU
if (cpu_is_offline(cpu))
cpu_play_dead();
#endif
schedule();
preempt_disable();
}