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x86: change _node_to_cpumask_ptr to return const ptr

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* Strengthen the return type for the _node_to_cpumask_ptr to be
    a const pointer.  This adds compiler checking to insure that
    node_to_cpumask_map[] is not changed inadvertently.

Signed-off-by: Mike Travis <travis@sgi.com>
Cc: "akpm@linux-foundation.org" <akpm@linux-foundation.org>
Cc: Yinghai Lu <yhlu.kernel@gmail.com>
Acked-by: Vegard Nossum <vegard.nossum@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Mike Travis 2008-07-08 14:35:21 -07:00 committed by Ingo Molnar
parent ce8b06b985
commit 11369f356b
3 changed files with 11 additions and 10 deletions
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8
arch/x86/kernel/setup_percpu.c
View file

@ -343,23 +343,23 @@ static const cpumask_t cpu_mask_none;
/*
* Returns a pointer to the bitmask of CPUs on Node 'node'.
*/
cpumask_t *_node_to_cpumask_ptr(int node)
const cpumask_t *_node_to_cpumask_ptr(int node)
{
if (node_to_cpumask_map == NULL) {
printk(KERN_WARNING
"_node_to_cpumask_ptr(%d): no node_to_cpumask_map!\n",
node);
dump_stack();
return &cpu_online_map;
return (const cpumask_t *)&cpu_online_map;
}
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 &cpu_mask_none;
}
return (cpumask_t *)&node_to_cpumask_map[node];
return &node_to_cpumask_map[node];
}
EXPORT_SYMBOL(_node_to_cpumask_ptr);

3
include/asm-generic/topology.h
View file

@ -60,7 +60,8 @@
#ifndef node_to_cpumask_ptr
#define node_to_cpumask_ptr(v, node) \
cpumask_t _##v = node_to_cpumask(node), *v = &_##v
cpumask_t _##v = node_to_cpumask(node); \
const cpumask_t *v = &_##v
#define node_to_cpumask_ptr_next(v, node) \
_##v = node_to_cpumask(node)

10
include/asm-x86/topology.h
View file

@ -82,7 +82,7 @@ DECLARE_EARLY_PER_CPU(int, x86_cpu_to_node_map);
#ifdef CONFIG_DEBUG_PER_CPU_MAPS
extern int cpu_to_node(int cpu);
extern int early_cpu_to_node(int cpu);
extern cpumask_t *_node_to_cpumask_ptr(int node);
extern const cpumask_t *_node_to_cpumask_ptr(int node);
extern cpumask_t node_to_cpumask(int node);
#else /* !CONFIG_DEBUG_PER_CPU_MAPS */
@ -103,7 +103,7 @@ static inline int early_cpu_to_node(int cpu)
}
/* Returns a pointer to the cpumask of CPUs on Node 'node'. */
static inline cpumask_t *_node_to_cpumask_ptr(int node)
static inline const cpumask_t *_node_to_cpumask_ptr(int node)
{
return &node_to_cpumask_map[node];
}
@ -118,7 +118,7 @@ static inline cpumask_t node_to_cpumask(int node)
/* Replace default node_to_cpumask_ptr with optimized version */
#define node_to_cpumask_ptr(v, node) \
cpumask_t *v = _node_to_cpumask_ptr(node)
const cpumask_t *v = _node_to_cpumask_ptr(node)
#define node_to_cpumask_ptr_next(v, node) \
v = _node_to_cpumask_ptr(node)
@ -186,7 +186,7 @@ extern int __node_distance(int, int);
#define cpu_to_node(cpu) 0
#define early_cpu_to_node(cpu) 0
static inline cpumask_t *_node_to_cpumask_ptr(int node)
static inline const cpumask_t *_node_to_cpumask_ptr(int node)
{
return &cpu_online_map;
}
@ -201,7 +201,7 @@ static inline int node_to_first_cpu(int node)
/* Replace default node_to_cpumask_ptr with optimized version */
#define node_to_cpumask_ptr(v, node) \
cpumask_t *v = _node_to_cpumask_ptr(node)
const cpumask_t *v = _node_to_cpumask_ptr(node)
#define node_to_cpumask_ptr_next(v, node) \
v = _node_to_cpumask_ptr(node)