Messages in this thread Patch in this message | | | Subject | trival patch: disable interrupt in play_dead | From | Shaohua Li <> | Date | Mon, 28 Nov 2005 22:48:16 -0800 |
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It's physical CPU hotplug now, so disable interrupt in play_dead.
Signed-off-by: Shaohua Li <shaohua.li@intel.com> ---
linux-2.6.14-root/arch/x86_64/kernel/process.c | 5 +++-- linux-2.6.14-root/include/asm-x86_64/system.h | 2 ++ 2 files changed, 5 insertions(+), 2 deletions(-)
diff -puN arch/x86_64/kernel/process.c~cpuhp-disable-interrupt arch/x86_64/kernel/process.c --- linux-2.6.14/arch/x86_64/kernel/process.c~cpuhp-disable-interrupt 2005-11-28 22:20:28.000000000 -0800 +++ linux-2.6.14-root/arch/x86_64/kernel/process.c 2005-11-28 22:20:28.000000000 -0800 @@ -157,7 +157,7 @@ EXPORT_SYMBOL_GPL(cpu_idle_wait); DECLARE_PER_CPU(int, cpu_state); #include <asm/nmi.h> -/* We don't actually take CPU down, just spin without interrupts. */ +/* We halt the CPU with physical CPU hotplug */ static inline void play_dead(void) { idle_task_exit(); @@ -166,8 +166,9 @@ static inline void play_dead(void) /* Ack it */ __get_cpu_var(cpu_state) = CPU_DEAD; + local_irq_disable(); while (1) - safe_halt(); + halt(); } #else static inline void play_dead(void) diff -puN include/asm-x86_64/system.h~cpuhp-disable-interrupt include/asm-x86_64/system.h --- linux-2.6.14/include/asm-x86_64/system.h~cpuhp-disable-interrupt 2005-11-28 22:20:28.000000000 -0800 +++ linux-2.6.14-root/include/asm-x86_64/system.h 2005-11-28 22:20:28.000000000 -0800 @@ -315,6 +315,8 @@ static inline unsigned long __cmpxchg(vo #define local_irq_enable() __asm__ __volatile__("sti": : :"memory") /* used in the idle loop; sti takes one instruction cycle to complete */ #define safe_halt() __asm__ __volatile__("sti; hlt": : :"memory") +/* used when interrupts are already enabled or to shutdown the processor */ +#define halt() __asm__ __volatile__("hlt": : :"memory") #define irqs_disabled() \ ({ \ _
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