* NUMA-Q breakage 7/7 preempt vs. printk bootstrap ordering
@ 2002-07-12 22:40 William Lee Irwin III
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From: William Lee Irwin III @ 2002-07-12 22:40 UTC (permalink / raw)
To: linux-kernel; +Cc: rml
CONFIG_PREEMPT creates a bootstrap ordering issue as some implicit
scheduling done in printk.c raises exceptions prior to the secondary
cpus being prepared to handle them (seen as no vm86_info: BAD).
The workaround, enclosed below is not to use preempt on NUMA-Q.
Cheers,
Bill
===== arch/i386/config.in 1.40 vs edited =====
--- 1.40/arch/i386/config.in Mon Jun 17 07:03:16 2002
+++ edited/arch/i386/config.in Fri Jul 12 01:12:25 2002
@@ -165,7 +165,9 @@
define_bool CONFIG_X86_IO_APIC y
fi
else
- bool 'Multiquad NUMA system' CONFIG_MULTIQUAD
+ if [ "$CONFIG_PREEMPT" != "y" ]; then
+ bool 'Multiquad NUMA system' CONFIG_MULTIQUAD
+ fi
fi
bool 'Machine Check Exception' CONFIG_X86_MCE
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