linux-kernel - [PATCH] mdio: use inline functions for to_mdio

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Date:   Mon, 26 Oct 2020 17:51:09 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Russell King <linux@...linux.org.uk>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mdio: use inline functions for to_mdio_device() etc

From: Arnd Bergmann <arnd@...db.de>

Nesting container_of() causes warnings with W=2, and doing this
in a header means we see a lot of them, like:

In file included from drivers/net/mdio/of_mdio.c:11:
drivers/net/mdio/of_mdio.c: In function 'of_phy_find_device':
include/linux/kernel.h:852:8: warning: declaration of '__mptr' shadows a previous local [-Wshadow]
  852 |  void *__mptr = (void *)(ptr);     \
      |        ^~~~~~
include/linux/phy.h:655:26: note: in expansion of macro 'container_of'
  655 | #define to_phy_device(d) container_of(to_mdio_device(d), \
      |                          ^~~~~~~~~~~~
include/linux/mdio.h:52:27: note: in expansion of macro 'container_of'
   52 | #define to_mdio_device(d) container_of(d, struct mdio_device, dev)
      |                           ^~~~~~~~~~~~
include/linux/phy.h:655:39: note: in expansion of macro 'to_mdio_device'
  655 | #define to_phy_device(d) container_of(to_mdio_device(d), \
      |                                       ^~~~~~~~~~~~~~
drivers/net/mdio/of_mdio.c:379:10: note: in expansion of macro 'to_phy_device'
  379 |   return to_phy_device(&mdiodev->dev);
      |          ^~~~~~~~~~~~~
include/linux/kernel.h:852:8: note: shadowed declaration is here
  852 |  void *__mptr = (void *)(ptr);     \
      |        ^~~~~~
include/linux/phy.h:655:26: note: in expansion of macro 'container_of'
  655 | #define to_phy_device(d) container_of(to_mdio_device(d), \
      |                          ^~~~~~~~~~~~
drivers/net/mdio/of_mdio.c:379:10: note: in expansion of macro 'to_phy_device'
  379 |   return to_phy_device(&mdiodev->dev);
      |          ^~~~~~~~~~~~~

Redefine the macros in linux/mdio.h as inline functions to avoid this
problem.

Fixes: a9049e0c513c ("mdio: Add support for mdio drivers.")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 include/linux/mdio.h | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/include/linux/mdio.h b/include/linux/mdio.h
index dbd69b3d170b..7c059cb8e069 100644
--- a/include/linux/mdio.h
+++ b/include/linux/mdio.h
@@ -49,7 +49,10 @@ struct mdio_device {
 	unsigned int reset_assert_delay;
 	unsigned int reset_deassert_delay;
 };
-#define to_mdio_device(d) container_of(d, struct mdio_device, dev)
+static inline struct mdio_device *to_mdio_device(struct device *dev)
+{
+	return container_of(dev, struct mdio_device, dev);
+}
 
 /* struct mdio_driver_common: Common to all MDIO drivers */
 struct mdio_driver_common {
@@ -57,8 +60,11 @@ struct mdio_driver_common {
 	int flags;
 };
 #define MDIO_DEVICE_FLAG_PHY		1
-#define to_mdio_common_driver(d) \
-	container_of(d, struct mdio_driver_common, driver)
+static inline struct mdio_driver_common *
+to_mdio_common_driver(struct device_driver *drv)
+{
+	return container_of(drv, struct mdio_driver_common, driver);
+}
 
 /* struct mdio_driver: Generic MDIO driver */
 struct mdio_driver {
@@ -73,8 +79,12 @@ struct mdio_driver {
 	/* Clears up any memory if needed */
 	void (*remove)(struct mdio_device *mdiodev);
 };
-#define to_mdio_driver(d)						\
-	container_of(to_mdio_common_driver(d), struct mdio_driver, mdiodrv)
+
+static inline struct mdio_driver *to_mdio_driver(struct device_driver *drv)
+{
+	struct mdio_driver_common *common = to_mdio_common_driver(drv);
+	return container_of(common, struct mdio_driver, mdiodrv);
+}
 
 /* device driver data */
 static inline void mdiodev_set_drvdata(struct mdio_device *mdio, void *data)
-- 
2.27.0