diff options
| author | Shaohua Li | 2006-01-06 00:12:20 -0800 |
|---|---|---|
| committer | Linus Torvalds | 2006-01-06 08:33:39 -0800 |
| commit | 1fa744e6e91a895750b9980d13fcfc5791a0cd91 (patch) | |
| tree | 2ba30e6d4f263cdb5e5ec9a85fc1fecec9100036 | |
| parent | 766c3f94d4492ee4ec60b65693e71ee4b1d6fd68 (diff) | |
[PATCH] cpu hotplug/x86_64: disable interrupt in play_dead
With physical CPU hotplug, the CPU is hot removed and it should not receive
any interrupts. Disabling interrupt is much safer. This basically is what we
do in ia64 & x86.
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | arch/x86_64/kernel/process.c | 5 | ||||
| -rw-r--r-- | include/asm-x86_64/system.h | 2 |
2 files changed, 5 insertions, 2 deletions
diff --git a/arch/x86_64/kernel/process.c b/arch/x86_64/kernel/process.c index 7519fc520eb3..3060ed97b755 100644 --- a/arch/x86_64/kernel/process.c +++ b/arch/x86_64/kernel/process.c @@ -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 --git a/include/asm-x86_64/system.h b/include/asm-x86_64/system.h index 85348e02ad2e..b34cc2ee222b 100644 --- a/include/asm-x86_64/system.h +++ b/include/asm-x86_64/system.h @@ -315,6 +315,8 @@ static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old, #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() \ ({ \ |