linux-kernel - [PATCH 2/2] Use num_possible_cpus() instead of direct use of NR

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Date:	Sun, 10 Jan 2016 17:13:25 +0200
From:	Ameen <ameenali023@...il.com>
To:	mingo@...nel.org, peterz@...radead.org, mhocko@...e.com,
	vbabka@...e.cz
Cc:	linux-kernel@...r.kernel.org, Ameen <AmeenAli023@...il.com>
Subject: [PATCH 2/2] Use num_possible_cpus() instead of direct use of NR_CPUS.

WARNING: usage of NR_CPUS is often wrong - consider using cpu_possible(), num_possible_cpus()..

Signed-off-by : Ameen Ali <Ameenali023@...il.com>
---
 kernel/smp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/smp.c b/kernel/smp.c
index d903c02..94033ac 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -549,13 +549,13 @@ static int __init maxcpus(char *str)
 early_param("maxcpus", maxcpus);
 
 /* Setup number of possible processor ids */
-int nr_cpu_ids __read_mostly = NR_CPUS;
+int nr_cpu_ids __read_mostly = num_possible_cpus();
 EXPORT_SYMBOL(nr_cpu_ids);
 
 /* An arch may set nr_cpu_ids earlier if needed, so this would be redundant */
 void __init setup_nr_cpu_ids(void)
 {
-	nr_cpu_ids = find_last_bit(cpumask_bits(cpu_possible_mask),NR_CPUS) + 1;
+	nr_cpu_ids = find_last_bit(cpumask_bits(cpu_possible_mask),num_possible_cpus()) + 1;
 }
 
 void __weak smp_announce(void)
-- 
2.5.0