From b3242151906372f30f57feaa43b4cac96a23edb1 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Wed, 6 Feb 2008 01:37:01 -0800 Subject: [PATCH] PERCPU : __percpu_alloc_mask() can dynamically size percpu_data storage 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 Cc: Christoph Lameter Cc: "David S. Miller" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/percpu.h | 2 +- mm/allocpercpu.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/include/linux/percpu.h b/include/linux/percpu.h index 50faa0ea28e..1ac969724bb 100644 --- a/include/linux/percpu.h +++ b/include/linux/percpu.h @@ -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) diff --git a/mm/allocpercpu.c b/mm/allocpercpu.c index 00b02623f00..7e58322b713 100644 --- a/mm/allocpercpu.c +++ b/mm/allocpercpu.c @@ -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)) -- 2.41.1