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authorRalf Baechle <ralf@linux-mips.org>2009-06-23 10:00:31 +0100
committerRalf Baechle <ralf@linux-mips.org>2009-06-24 18:34:40 +0100
commit1b2bc75c1bde6581d2694cb3ed7fb06b69685008 (patch)
tree800fc23052bccb1fbf8acfbaabbf5648c69daa9e /arch/mips/kernel/process.c
parent4ac4aa5cc3b00cc558575065ae71043e92d1a69a (diff)
MIPS: Add arch generic CPU hotplug
Each platform has to add support for CPU hotplugging itself by providing suitable definitions for the cpu_disable and cpu_die of the smp_ops methods and setting SYS_SUPPORTS_HOTPLUG_CPU. A platform should only set SYS_SUPPORTS_HOTPLUG_CPU once all it's smp_ops definitions have the necessary changes. This patch contains the changes to the dummy smp_ops definition for uni-processor systems. Parts of the code contributed by Cavium Inc. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel/process.c')
-rw-r--r--arch/mips/kernel/process.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index 1eaaa450e20..c09d681b718 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -50,10 +50,15 @@
*/
void __noreturn cpu_idle(void)
{
+ int cpu;
+
+ /* CPU is going idle. */
+ cpu = smp_processor_id();
+
/* endless idle loop with no priority at all */
while (1) {
tick_nohz_stop_sched_tick(1);
- while (!need_resched()) {
+ while (!need_resched() && cpu_online(cpu)) {
#ifdef CONFIG_MIPS_MT_SMTC
extern void smtc_idle_loop_hook(void);
@@ -62,6 +67,12 @@ void __noreturn cpu_idle(void)
if (cpu_wait)
(*cpu_wait)();
}
+#ifdef CONFIG_HOTPLUG_CPU
+ if (!cpu_online(cpu) && !cpu_isset(cpu, cpu_callin_map) &&
+ (system_state == SYSTEM_RUNNING ||
+ system_state == SYSTEM_BOOTING))
+ play_dead();
+#endif
tick_nohz_restart_sched_tick();
preempt_enable_no_resched();
schedule();