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x86: add debug of invalid per_cpu map accesses 

dont crash survivable situations.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ingo Molnar 2008-01-30 13:33:23 +01:00
parent c49a4955ea
commit 5f5cd8fd60
1 changed files with 5 additions and 4 deletions
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7
include/asm-x86/topology.h
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@ -67,13 +67,14 @@ static inline int early_cpu_to_node(int cpu)
static inline int cpu_to_node(int cpu) static inline int cpu_to_node(int cpu)
{ {
#ifdef CONFIG_DEBUG_PER_CPU_MAPS #ifdef CONFIG_DEBUG_PER_CPU_MAPS
if(x86_cpu_to_node_map_early_ptr) { if (x86_cpu_to_node_map_early_ptr) {
printk("KERN_NOTICE cpu_to_node(%d): usage too early!\n", printk("KERN_NOTICE cpu_to_node(%d): usage too early!\n",
(int)cpu); (int)cpu);
BUG(); dump_stack();
return ((int *)x86_cpu_to_node_map_early_ptr)[cpu];
} }
#endif #endif
if(per_cpu_offset(cpu)) if (per_cpu_offset(cpu))
return per_cpu(x86_cpu_to_node_map, cpu); return per_cpu(x86_cpu_to_node_map, cpu);
else else
return NUMA_NO_NODE; return NUMA_NO_NODE;