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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2005-11-03 00:51:40 +0300
committerRussell King <rmk+kernel@arm.linux.org.uk>2005-11-03 00:51:40 +0300
commit71f512e89704f5aa6fc0b97e4a719184080b8938 (patch)
tree91f855b3c03b9f1c5404e7901e6cb925e091004d
parent7e86df273292b3a88c14b9aed1006cddac2b4c23 (diff)
downloadlinux-71f512e89704f5aa6fc0b97e4a719184080b8938.tar.xz
[ARM SMP] Track CPU idle threads
Track the idle thread task_struct for each CPU. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/kernel/smp.c20
-rw-r--r--include/asm-arm/cpu.h1
2 files changed, 14 insertions, 7 deletions
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 826164945747..45877f5d5717 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -80,19 +80,23 @@ static DEFINE_SPINLOCK(smp_call_function_lock);
int __cpuinit __cpu_up(unsigned int cpu)
{
- struct task_struct *idle;
+ struct cpuinfo_arm *ci = &per_cpu(cpu_data, cpu);
+ struct task_struct *idle = ci->idle;
pgd_t *pgd;
pmd_t *pmd;
int ret;
/*
- * Spawn a new process manually. Grab a pointer to
- * its task struct so we can mess with it
+ * Spawn a new process manually, if not already done.
+ * Grab a pointer to its task struct so we can mess with it
*/
- idle = fork_idle(cpu);
- if (IS_ERR(idle)) {
- printk(KERN_ERR "CPU%u: fork() failed\n", cpu);
- return PTR_ERR(idle);
+ if (!idle) {
+ idle = fork_idle(cpu);
+ if (IS_ERR(idle)) {
+ printk(KERN_ERR "CPU%u: fork() failed\n", cpu);
+ return PTR_ERR(idle);
+ }
+ ci->idle = idle;
}
/*
@@ -236,6 +240,8 @@ void __init smp_prepare_boot_cpu(void)
{
unsigned int cpu = smp_processor_id();
+ per_cpu(cpu_data, cpu).idle = current;
+
cpu_set(cpu, cpu_possible_map);
cpu_set(cpu, cpu_present_map);
cpu_set(cpu, cpu_online_map);
diff --git a/include/asm-arm/cpu.h b/include/asm-arm/cpu.h
index fcbdd40cb667..751bc7462074 100644
--- a/include/asm-arm/cpu.h
+++ b/include/asm-arm/cpu.h
@@ -16,6 +16,7 @@
struct cpuinfo_arm {
struct cpu cpu;
#ifdef CONFIG_SMP
+ struct task_struct *idle;
unsigned int loops_per_jiffy;
#endif
};