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From: Tejun Heo on 20 Jul 2010 05:20
Commit f3421797 (workqueue: implement unbound workqueue) incorrectly
tested CONFIG_SMP as part of a C expression in alloc/free_cwqs(). As
CONFIG_SMP is not defined in UP, this breaks build. Fix it by using

Found during linux-next build test.

Signed-off-by: Tejun Heo <tj(a)kernel.org>
Reported-by: Stephen Rothwell <sfr(a)canb.auug.org.au>
---
kernel/workqueue.c | 18 ++++++++++++++----
1 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index aca9472..79a11e4 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -2615,11 +2615,15 @@ 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 (CONFIG_SMP && !(wq->flags & WQ_UNBOUND)) {
- /* on SMP, percpu allocator can align itself */
+ if (percpu)
wq->cpu_wq.pcpu = __alloc_percpu(size, align);
- } else {
+ else {
void *ptr;

/*
@@ -2641,7 +2645,13 @@ static int alloc_cwqs(struct workqueue_struct *wq)

static void free_cwqs(struct workqueue_struct *wq)
{
- if (CONFIG_SMP && !(wq->flags & WQ_UNBOUND))
+#ifdef CONFIG_SMP
+ bool percpu = !(wq->flags & WQ_UNBOUND);
+#else
+ bool percpu = false;
+#endif
+
+ if (percpu)
free_percpu(wq->cpu_wq.pcpu);
else if (wq->cpu_wq.single) {
/* the pointer to free is stored right after the cwq */
--
1.6.4.2

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Prev: mfd: MAX8998: Add interrupts support
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