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PERCPU : __percpu_alloc_mask() can dynamically size percpu_data storage

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Instead of allocating a fix sized array of NR_CPUS pointers for percpu_data,
we can use nr_cpu_ids, which is generally < NR_CPUS.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Eric Dumazet 2008-02-06 01:37:01 -08:00 committed by Linus Torvalds
parent e7ca2d41a0
commit b324215190
2 changed files with 2 additions and 2 deletions
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2
include/linux/percpu.h
View file

@ -54,7 +54,7 @@
#ifdef CONFIG_SMP
struct percpu_data {
void *ptrs[NR_CPUS];
void *ptrs[1];
};
#define __percpu_disguise(pdata) (struct percpu_data *)~(unsigned long)(pdata)

2
mm/allocpercpu.c
View file

@ -98,7 +98,7 @@ EXPORT_SYMBOL_GPL(__percpu_populate_mask);
*/
void *__percpu_alloc_mask(size_t size, gfp_t gfp, cpumask_t *mask)
{
void *pdata = kzalloc(sizeof(struct percpu_data), gfp);
void *pdata = kzalloc(nr_cpu_ids * sizeof(void *), gfp);
void *__pdata = __percpu_disguise(pdata);
if (unlikely(!pdata))