[PATCH v2 2/4] device.h: move kobj_to_dev() to use container_of_const()

From: Greg Kroah-Hartman
Date: Mon Dec 05 2022 - 07:12:19 EST


Instead of rolling our own const-checking logic, use the newly
introduced container_of_const() to handle it all for us automatically.

Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
v2: - respin with changed container_of_const() parameters

include/linux/device.h | 21 +--------------------
1 file changed, 1 insertion(+), 20 deletions(-)

diff --git a/include/linux/device.h b/include/linux/device.h
index 84ae52de6746..8d172d06b8c1 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -680,26 +680,7 @@ struct device_link {
bool supplier_preactivated; /* Owned by consumer probe. */
};

-static inline struct device *__kobj_to_dev(struct kobject *kobj)
-{
- return container_of(kobj, struct device, kobj);
-}
-
-static inline const struct device *__kobj_to_dev_const(const struct kobject *kobj)
-{
- return container_of(kobj, const struct device, kobj);
-}
-
-/*
- * container_of() will happily take a const * and spit back a non-const * as it
- * is just doing pointer math. But we want to be a bit more careful in the
- * driver code, so manually force any const * of a kobject to also be a const *
- * to a device.
- */
-#define kobj_to_dev(kobj) \
- _Generic((kobj), \
- const struct kobject *: __kobj_to_dev_const, \
- struct kobject *: __kobj_to_dev)(kobj)
+#define kobj_to_dev(__kobj) container_of_const(__kobj, struct device, kobj)

/**
* device_iommu_mapped - Returns true when the device DMA is translated
--
2.38.1