linux-kernel - [PATCH] regmap:change struct regmap's internal locks as union

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Date:	Thu, 11 Sep 2014 16:19:49 +0800
From:	"Wang, Yalin" <Yalin.Wang@...ymobile.com>
To:	"'broonie@...nel.org'" <broonie@...nel.org>,
	"'linux-driver@...gic.com'" <linux-driver@...gic.com>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"'linux-arm-kernel@...ts.infradead.org'" 
	<linux-arm-kernel@...ts.infradead.org>,
	"'linux@....linux.org.uk'" <linux@....linux.org.uk>
Subject: [PATCH] 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@...ymobile.com>
---
 drivers/base/regmap/internal.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h
index bfc90b8..0da5865 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;
-- 
2.1.0

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