Currently per_cpu_ptr() doesn't really do anything with 'cpu' in the UP
case. This is problematic in the cases where this is the only place the
variable is referenced:
CC kernel/workqueue.o
kernel/workqueue.c: In function `current_is_keventd':
kernel/workqueue.c:460: warning: unused variable `cpu'
How about something like this?
diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index 5451eb1..fb8d2d2 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -38,7 +38,7 @@ extern void free_percpu(const void *);
#else /* CONFIG_SMP */
-#define per_cpu_ptr(ptr, cpu) (ptr)
+#define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); (ptr); })
static inline void *__alloc_percpu(size_t size, size_t align)
{
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