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| author | Shaohua Li <shaohua.li@intel.com> | 2006-01-06 00:12:20 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-06 08:33:39 -0800 |
| commit | 1fa744e6e91a895750b9980d13fcfc5791a0cd91 (patch) | |
| tree | 2ba30e6d4f263cdb5e5ec9a85fc1fecec9100036 /include/asm-x86_64 | |
| parent | 766c3f94d4492ee4ec60b65693e71ee4b1d6fd68 (diff) | |
| download | lwn-1fa744e6e91a895750b9980d13fcfc5791a0cd91.tar.gz lwn-1fa744e6e91a895750b9980d13fcfc5791a0cd91.zip | |
[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>
Diffstat (limited to 'include/asm-x86_64')
| -rw-r--r-- | include/asm-x86_64/system.h | 2 |
1 files changed, 2 insertions, 0 deletions
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() \ ({ \ |