regmap: change struct regmap's internal locks as union

this patch change struct regmap->mutex and struct regmap->spinlock
as an union, because these 2 members are only used one of them,
we change it to shrink the struct size.

Signed-off-by: Yalin Wang <yalin.wang@sonymobile.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h
index 7d1326985bee..f82e8faa5d93 100644
--- a/drivers/base/regmap/internal.h
+++ b/drivers/base/regmap/internal.h
@@ -49,8 +49,10 @@ struct regmap_async {
 };
 
 struct regmap {
-        struct mutex mutex;
-        spinlock_t spinlock;
+        union {
+                struct mutex mutex;
+                spinlock_t spinlock;
+        };
         unsigned long spinlock_flags;
         regmap_lock lock;
         regmap_unlock unlock;