workqueue: fix build problem on !CONFIG_SMP

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@kernel.org>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>

1 files changed, 14 insertions, 4 deletions

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index aca94726e20a..79a11e40f311 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 */