linux-kernel - [PATCH 4/8] padata: Initialize the padata queues only for the used cpus

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Date:	Thu, 29 Apr 2010 14:41:36 +0200
From:	Steffen Klassert <steffen.klassert@...unet.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 4/8] padata: Initialize the padata queues only for the used
 cpus

padata_alloc_pd set up queues for all possible cpus.
This patch changes this to set up the queues just for
the used cpus.

Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
---
 kernel/padata.c |   14 +++++---------
 1 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/kernel/padata.c b/kernel/padata.c
index 5fa6ba6..fc9f19a 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -358,17 +358,15 @@ static struct parallel_data *padata_alloc_pd(struct padata_instance *pinst,
 	if (!alloc_cpumask_var(&pd->cpumask, GFP_KERNEL))
 		goto err_free_queue;
 
-	for_each_possible_cpu(cpu) {
+	cpumask_and(pd->cpumask, cpumask, cpu_active_mask);
+
+	for_each_cpu(cpu, pd->cpumask) {
 		queue = per_cpu_ptr(pd->queue, cpu);
 
 		queue->pd = pd;
 
-		if (cpumask_test_cpu(cpu, cpumask)
-		    && cpumask_test_cpu(cpu, cpu_active_mask)) {
-			queue->cpu_index = cpu_index;
-			cpu_index++;
-		} else
-			queue->cpu_index = -1;
+		queue->cpu_index = cpu_index;
+		cpu_index++;
 
 		INIT_LIST_HEAD(&queue->reorder.list);
 		INIT_LIST_HEAD(&queue->parallel.list);
@@ -382,8 +380,6 @@ static struct parallel_data *padata_alloc_pd(struct padata_instance *pinst,
 		atomic_set(&queue->num_obj, 0);
 	}
 
-	cpumask_and(pd->cpumask, cpumask, cpu_active_mask);
-
 	num_cpus = cpumask_weight(pd->cpumask);
 	pd->max_seq_nr = (MAX_SEQ_NR / num_cpus) * num_cpus - 1;
 
-- 
1.5.6.5

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