percpu: move accessors from include/linux/percpu.h to percpu-defs.h
include/linux/percpu-defs.h is gonna host all accessors and operations
so that arch headers can make use of them too without worrying about
circular dependency through include/linux/percpu.h.
This patch moves the following accessors from include/linux/percpu.h
to include/linux/percpu-defs.h.
* get/put_cpu_var()
* get/put_cpu_ptr()
* per_cpu_ptr()
This is pure reorgniazation.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Christoph Lameter <cl@linux.com>
diff --git a/include/linux/percpu-defs.h b/include/linux/percpu-defs.h
index 1a1af3e..f782f98 100644
--- a/include/linux/percpu-defs.h
+++ b/include/linux/percpu-defs.h
@@ -252,5 +252,37 @@
/* keep until we have removed all uses of __this_cpu_ptr */
#define __this_cpu_ptr(ptr) raw_cpu_ptr(ptr)
+/*
+ * Must be an lvalue. Since @var must be a simple identifier,
+ * we force a syntax error here if it isn't.
+ */
+#define get_cpu_var(var) (*({ \
+ preempt_disable(); \
+ this_cpu_ptr(&var); }))
+
+/*
+ * The weird & is necessary because sparse considers (void)(var) to be
+ * a direct dereference of percpu variable (var).
+ */
+#define put_cpu_var(var) do { \
+ (void)&(var); \
+ preempt_enable(); \
+} while (0)
+
+#define get_cpu_ptr(var) ({ \
+ preempt_disable(); \
+ this_cpu_ptr(var); })
+
+#define put_cpu_ptr(var) do { \
+ (void)(var); \
+ preempt_enable(); \
+} while (0)
+
+#ifdef CONFIG_SMP
+#define per_cpu_ptr(ptr, cpu) SHIFT_PERCPU_PTR((ptr), per_cpu_offset((cpu)))
+#else
+#define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); VERIFY_PERCPU_PTR((ptr)); })
+#endif
+
#endif /* __ASSEMBLY__ */
#endif /* _LINUX_PERCPU_DEFS_H */