linux-kernel - [PATCH] workqueue: use percpu allocator for cwq on UP

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Message-ID: <4F59D568.4030604@cn.fujitsu.com>
Date:	Fri, 09 Mar 2012 18:03:20 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Tejun Heo <tj@...nel.org>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] workqueue: use percpu allocator for cwq on UP

I notice that the commit bbddff makes percpu allocator can work on UP,
So we don't need the magic way for UP.

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
Just pass build test

 kernel/workqueue.c |   22 +++-------------------
 1 files changed, 3 insertions(+), 19 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index bec7b5b..5bbba09 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -474,13 +474,8 @@ static struct cpu_workqueue_struct *get_cwq(unsigned int cpu,
 					    struct workqueue_struct *wq)
 {
 	if (!(wq->flags & WQ_UNBOUND)) {
-		if (likely(cpu < nr_cpu_ids)) {
-#ifdef CONFIG_SMP
+		if (likely(cpu < nr_cpu_ids))
 			return per_cpu_ptr(wq->cpu_wq.pcpu, cpu);
-#else
-			return wq->cpu_wq.single;
-#endif
-		}
 	} else if (likely(cpu == WORK_CPU_UNBOUND))
 		return wq->cpu_wq.single;
 	return NULL;
@@ -2897,13 +2892,8 @@ static int alloc_cwqs(struct workqueue_struct *wq)
 	const size_t size = sizeof(struct cpu_workqueue_struct);
 	const size_t align = max_t(size_t, 1 << WORK_STRUCT_FLAG_BITS,
 				   __alignof__(unsigned long long));
-#ifdef CONFIG_SMP
-	bool percpu = !(wq->flags & WQ_UNBOUND);
-#else
-	bool percpu = false;
-#endif
 
-	if (percpu)
+	if (!(wq->flags & WQ_UNBOUND))
 		wq->cpu_wq.pcpu = __alloc_percpu(size, align);
 	else {
 		void *ptr;
@@ -2927,13 +2917,7 @@ static int alloc_cwqs(struct workqueue_struct *wq)
 
 static void free_cwqs(struct workqueue_struct *wq)
 {
-#ifdef CONFIG_SMP
-	bool percpu = !(wq->flags & WQ_UNBOUND);
-#else
-	bool percpu = false;
-#endif
-
-	if (percpu)
+	if (!(wq->flags & WQ_UNBOUND))
 		free_percpu(wq->cpu_wq.pcpu);
 	else if (wq->cpu_wq.single) {
 		/* the pointer to free is stored right after the cwq */
--
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