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| author | Li Shaohua <shaohua.li@intel.com> | 2005-06-25 14:54:56 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-25 16:24:30 -0700 |
| commit | e1367daf3eed5cd619ee88c9907e1e6ddaa58406 (patch) | |
| tree | dce60efefba356e0a914669587586a6174e41b94 /arch/i386/kernel/process.c | |
| parent | 0bb3184df537002a742bafddf3f4fb482b7fe610 (diff) | |
| download | blackbird-op-linux-e1367daf3eed5cd619ee88c9907e1e6ddaa58406.tar.gz blackbird-op-linux-e1367daf3eed5cd619ee88c9907e1e6ddaa58406.zip | |
[PATCH] cpu state clean after hot remove
Clean CPU states in order to reuse smp boot code for CPU hotplug.
Signed-off-by: Li Shaohua<shaohua.li@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386/kernel/process.c')
| -rw-r--r-- | arch/i386/kernel/process.c | 20 |
1 files changed, 9 insertions, 11 deletions
diff --git a/arch/i386/kernel/process.c b/arch/i386/kernel/process.c index e06f2dc7123d..5f8cfa6b7940 100644 --- a/arch/i386/kernel/process.c +++ b/arch/i386/kernel/process.c @@ -152,21 +152,19 @@ static void poll_idle (void) /* We don't actually take CPU down, just spin without interrupts. */ static inline void play_dead(void) { + /* This must be done before dead CPU ack */ + cpu_exit_clear(); + wbinvd(); + mb(); /* Ack it */ __get_cpu_var(cpu_state) = CPU_DEAD; - /* We shouldn't have to disable interrupts while dead, but - * some interrupts just don't seem to go away, and this makes - * it "work" for testing purposes. */ - /* Death loop */ - while (__get_cpu_var(cpu_state) != CPU_UP_PREPARE) - cpu_relax(); - + /* + * With physical CPU hotplug, we should halt the cpu + */ local_irq_disable(); - __flush_tlb_all(); - cpu_set(smp_processor_id(), cpu_online_map); - enable_APIC_timer(); - local_irq_enable(); + while (1) + __asm__ __volatile__("hlt":::"memory"); } #else static inline void play_dead(void) |
