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x86: add check for node passed to node_to_cpumask, v3 

* When CONFIG_DEBUG_PER_CPU_MAPS is set, the node passed to
    node_to_cpumask and node_to_cpumask_ptr should be validated.
    If invalid, then a dump_stack is performed and a zero cpumask
    is returned.

v2: Slightly different version to remove a compiler warning.
v3: Redone to reflect moving setup.c -> setup_percpu.c

Signed-off-by: Mike Travis <travis@sgi.com>
Cc: Vegard Nossum <vegard.nossum@gmail.com>
Cc: "akpm@linux-foundation.org" <akpm@linux-foundation.org>
Cc: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Mike Travis 2008-06-27 10:10:13 -07:00 committed by Ingo Molnar
parent cd5dce2fb0
commit 6a2f47ca27
2 changed files with 29 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
arch/x86/kernel/setup_percpu.c
View File

@ -346,6 +346,10 @@ int early_cpu_to_node(int cpu)
return per_cpu(x86_cpu_to_node_map, cpu);
}
/* empty cpumask */
static const cpumask_t cpu_mask_none;
/*
* Returns a pointer to the bitmask of CPUs on Node 'node'.
*/
@ -358,13 +362,23 @@ cpumask_t *_node_to_cpumask_ptr(int node)
dump_stack();
return &cpu_online_map;
}
BUG_ON(node >= nr_node_ids);
return &node_to_cpumask_map[node];
if (node >= nr_node_ids) {
printk(KERN_WARNING
"_node_to_cpumask_ptr(%d): node > nr_node_ids(%d)\n",
node, nr_node_ids);
dump_stack();
return (cpumask_t *)&cpu_mask_none;
}
return (cpumask_t *)&node_to_cpumask_map[node];
}
EXPORT_SYMBOL(_node_to_cpumask_ptr);
/*
* Returns a bitmask of CPUs on Node 'node'.
*
* Side note: this function creates the returned cpumask on the stack
* so with a high NR_CPUS count, excessive stack space is used. The
* node_to_cpumask_ptr function should be used whenever possible.
*/
cpumask_t node_to_cpumask(int node)
{
@ -374,7 +388,13 @@ cpumask_t node_to_cpumask(int node)
dump_stack();
return cpu_online_map;
}
BUG_ON(node >= nr_node_ids);
if (node >= nr_node_ids) {
printk(KERN_WARNING
"node_to_cpumask(%d): node > nr_node_ids(%d)\n",
node, nr_node_ids);
dump_stack();
return cpu_mask_none;
}
return node_to_cpumask_map[node];
}
EXPORT_SYMBOL(node_to_cpumask);

7
include/asm-x86/topology.h
View File

@ -57,7 +57,12 @@ static inline int cpu_to_node(int cpu)
}
#define early_cpu_to_node(cpu) cpu_to_node(cpu)
/* Returns a bitmask of CPUs on Node 'node'. */
/* Returns a bitmask of CPUs on Node 'node'.
*
* Side note: this function creates the returned cpumask on the stack
* so with a high NR_CPUS count, excessive stack space is used. The
* node_to_cpumask_ptr function should be used whenever possible.
*/
static inline cpumask_t node_to_cpumask(int node)
{
return node_to_cpumask_map[node];