netdev - [PATCH][ipsec] xfrm: replace NR_CPU with num_possible

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Message-Id: <1529062735-28407-1-git-send-email-lirongqing@baidu.com>
Date:   Fri, 15 Jun 2018 19:38:55 +0800
From:   Li RongQing <lirongqing@...du.com>
To:     netdev@...r.kernel.org, steffen.klassert@...unet.com
Subject: [PATCH][ipsec] xfrm: replace NR_CPU with num_possible_cpus()

The default NR_CPUS can be very large, but actual possible nr_cpu_ids
usually is very small. For some x86 distribution, the NR_CPUS is 8192
and nr_cpu_ids is 4.

when xfrm_init is running, num_possible_cpus() should work

Signed-off-by: Li RongQing <lirongqing@...du.com>
Signed-off-by: Wang Li <wangli39@...du.com>
---
 net/xfrm/xfrm_policy.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 40b54cc64243..cbb862463cbd 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -2988,12 +2988,13 @@ static struct pernet_operations __net_initdata xfrm_net_ops = {
 void __init xfrm_init(void)
 {
 	int i;
+	unsigned int nr_cpus = num_possible_cpus();
 
-	xfrm_pcpu_work = kmalloc_array(NR_CPUS, sizeof(*xfrm_pcpu_work),
+	xfrm_pcpu_work = kmalloc_array(nr_cpus, sizeof(*xfrm_pcpu_work),
 				       GFP_KERNEL);
 	BUG_ON(!xfrm_pcpu_work);
 
-	for (i = 0; i < NR_CPUS; i++)
+	for (i = 0; i < nr_cpus; i++)
 		INIT_WORK(&xfrm_pcpu_work[i], xfrm_pcpu_work_fn);
 
 	register_pernet_subsys(&xfrm_net_ops);
-- 
2.16.2