AcoSail/kernel_optimize_test
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[PATCH] i386/x86-64 disable LAPIC completely for offline CPU

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Disabling LAPIC timer isn't sufficient.  In some situations, such as we
enabled NMI watchdog, there is still unexpected interrupt (such as NMI)
invoked in offline CPU.  This also avoids offline CPU receives spurious
interrupt and anything similar.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Acked-by: "Seth, Rohit" <rohit.seth@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Shaohua Li 2005-12-12 22:17:08 -08:00 committed by Linus Torvalds
parent 68e1889112
commit 5e9ef02ec0
2 changed files with 2 additions and 3 deletions
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3
arch/i386/kernel/smpboot.c
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@ -1338,8 +1338,7 @@ int __cpu_disable(void)
if (cpu == 0)
return -EBUSY;
/* We enable the timer again on the exit path of the death loop */
disable_APIC_timer();
clear_local_APIC();
/* Allow any queued timer interrupts to get serviced */
local_irq_enable();
mdelay(1);

2
arch/x86_64/kernel/smpboot.c
View File

@ -1181,7 +1181,7 @@ int __cpu_disable(void)
if (cpu == 0)
return -EBUSY;
disable_APIC_timer();
clear_local_APIC();
/*
* HACK: