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>

diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h
index 7d13269..f82e8fa 100644 (file)
--- 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;