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| author | David S. Miller <davem@sunset.davemloft.net> | 2007-07-16 12:49:40 +0200 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-07-16 13:05:32 +0200 |
| commit | e0204409df29fe1b7d18f81dfc3ae6f9d90e7a63 (patch) | |
| tree | 66f670c0f182d02185f2f3ea6bb7bb97c165ff3b /arch/sparc64/kernel/process.c | |
| parent | [SERIAL]: Fix console write locking in sparc drivers. (diff) | |
| download | linux-e0204409df29fe1b7d18f81dfc3ae6f9d90e7a63.tar.xz linux-e0204409df29fe1b7d18f81dfc3ae6f9d90e7a63.zip | |
[SPARC64]: dr-cpu unconfigure support.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64/kernel/process.c')
| -rw-r--r-- | arch/sparc64/kernel/process.c | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/arch/sparc64/kernel/process.c b/arch/sparc64/kernel/process.c index f5f97e2c669c..93557507ec9f 100644 --- a/arch/sparc64/kernel/process.c +++ b/arch/sparc64/kernel/process.c @@ -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(); } |