The cpu_online_map stuff for hotplug cpu created a brand new bootstrap
ordering problem for NUMA-Q. The mmapped portio region needs to be
ioremapped early but ioremap attempts to do TLB shootdown, and
smp_call_function() (called by flush_tlb_all()) deadlocks when
cpu_online_map is uninitialized.
Workaround (due to Matt Dobson) below.
diff -Nur linux-2.5.23-vanilla/arch/i386/kernel/smp.c linux-2.5.23-patched/arch/i386/kernel/smp.c
--- linux-2.5.23-vanilla/arch/i386/kernel/smp.c Tue Jun 18 19:11:47 2002
+++ linux-2.5.23-patched/arch/i386/kernel/smp.c Mon Jul 8 14:52:32 2002
@@ -569,7 +569,7 @@
struct call_data_struct data;
int cpus = num_online_cpus()-1;
- if (!cpus)
+ if (cpus <= 0)
return 0;
data.func = func;
-
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This archive was generated by hypermail 2b29 : Mon Jul 15 2002 - 22:00:24 EST