linux-kernel - [PATCH 1/9] serdev: Convert to_serdev_device() and to_serdev

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Message-Id: <20251112-pci-m2-e-v1-1-97413d6bf824@oss.qualcomm.com>
Date: Wed, 12 Nov 2025 20:15:13 +0530
From: Manivannan Sadhasivam via B4 Relay <devnull+manivannan.sadhasivam.oss.qualcomm.com@...nel.org>
To: Rob Herring <robh@...nel.org>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Jiri Slaby <jirislaby@...nel.org>, Nathan Chancellor <nathan@...nel.org>, 
 Nicolas Schier <nicolas.schier@...ux.dev>, Hans de Goede <hansg@...nel.org>, 
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, 
 Mark Pearson <mpearson-lenovo@...ebb.ca>, 
 "Derek J. Clark" <derekjohn.clark@...il.com>, 
 Manivannan Sadhasivam <mani@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Marcel Holtmann <marcel@...tmann.org>, 
 Luiz Augusto von Dentz <luiz.dentz@...il.com>, 
 Bartosz Golaszewski <brgl@...ev.pl>
Cc: linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-kbuild@...r.kernel.org, platform-driver-x86@...r.kernel.org, 
 linux-pci@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org, linux-bluetooth@...r.kernel.org, 
 linux-pm@...r.kernel.org, Stephan Gerhold <stephan.gerhold@...aro.org>, 
 Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>, 
 Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
Subject: [PATCH 1/9] serdev: Convert to_serdev_device() and
 to_serdev_controller() helpers to macros

From: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>

If these helpers receive the 'const struct device' pointer, then the const
qualifier will get dropped, leading to below warning:

warning: passing argument 1 of ‘to_serdev_device_driver’ discards 'const'
qualifier from pointer target type [-Wdiscarded-qualifiers]

This is not an issue as of now, but with the future commits adding serdev
device based driver matching, this warning will get triggered. Hence,
convert these helpers to macros so that the qualifier get preserved.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
---
 include/linux/serdev.h | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/include/linux/serdev.h b/include/linux/serdev.h
index 34562eb99931d808e885ce5022b8aa4577566885..ab185cac556380dfa3cdf94b7af6ee168b677587 100644
--- a/include/linux/serdev.h
+++ b/include/linux/serdev.h
@@ -49,10 +49,7 @@ struct serdev_device {
 	struct mutex write_lock;
 };

-static inline struct serdev_device *to_serdev_device(struct device *d)
-{
-	return container_of(d, struct serdev_device, dev);
-}
+#define to_serdev_device(d) container_of(d, struct serdev_device, dev)

 /**
  * struct serdev_device_driver - serdev slave device driver
@@ -67,10 +64,7 @@ struct serdev_device_driver {
 	void	(*remove)(struct serdev_device *);
 };

-static inline struct serdev_device_driver *to_serdev_device_driver(struct device_driver *d)
-{
-	return container_of(d, struct serdev_device_driver, driver);
-}
+#define to_serdev_device_driver(d) container_of(d, struct serdev_device_driver, driver)

 enum serdev_parity {
 	SERDEV_PARITY_NONE,

-- 
2.48.1