linux-kernel - [PATCH v2 1/2] device property: Get rid of __PROPERTY_ENTRY_ARRAY

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Date:   Fri, 11 Nov 2022 14:15:17 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH v2 1/2] device property: Get rid of __PROPERTY_ENTRY_ARRAY_EL*SIZE*()

First of all, _ELEMENT_SIZE() repeats existing sizeof_field() macro.
Second, usage of _ARRAY_ELSIZE_LEN() adds unnecessary indirection
to the data layout. It's more understandable when the data structure
is placed explicitly. That said, get rid of those macros by replacing
them with the existing helper and explicit data structure layout.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
v2: rebased on latest Linux Next, fixed anon union assignment
 include/linux/property.h | 34 ++++++++++++++--------------------
 1 file changed, 14 insertions(+), 20 deletions(-)

diff --git a/include/linux/property.h b/include/linux/property.h
index 5d840299146d..aa58d4e8a21c 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -12,6 +12,7 @@
 
 #include <linux/bits.h>
 #include <linux/fwnode.h>
+#include <linux/stddef.h>
 #include <linux/types.h>
 
 struct device;
@@ -311,24 +312,14 @@ struct property_entry {
  * crafted to avoid gcc-4.4.4's problems with initialization of anon unions
  * and structs.
  */
-
-#define __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_)				\
-	sizeof(((struct property_entry *)NULL)->value._elem_[0])
-
-#define __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, _elsize_, _Type_,	\
-					  _val_, _len_)			\
-(struct property_entry) {						\
-	.name = _name_,							\
-	.length = (_len_) * (_elsize_),					\
-	.type = DEV_PROP_##_Type_,					\
-	{ .pointer = _val_ },						\
+#define __PROPERTY_ENTRY_ARRAY_LEN(_name_, _elem_, _Type_, _val_, _len_)		\
+(struct property_entry) {								\
+	.name = _name_,									\
+	.length = (_len_) * sizeof_field(struct property_entry, value._elem_[0]),	\
+	.type = DEV_PROP_##_Type_,							\
+	{ .pointer = _val_ },								\
 }
 
-#define __PROPERTY_ENTRY_ARRAY_LEN(_name_, _elem_, _Type_, _val_, _len_)\
-	__PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_,			\
-				__PROPERTY_ENTRY_ELEMENT_SIZE(_elem_),	\
-				_Type_, _val_, _len_)
-
 #define PROPERTY_ENTRY_U8_ARRAY_LEN(_name_, _val_, _len_)		\
 	__PROPERTY_ENTRY_ARRAY_LEN(_name_, u8_data, U8, _val_, _len_)
 #define PROPERTY_ENTRY_U16_ARRAY_LEN(_name_, _val_, _len_)		\
@@ -340,9 +331,12 @@ struct property_entry {
 #define PROPERTY_ENTRY_STRING_ARRAY_LEN(_name_, _val_, _len_)		\
 	__PROPERTY_ENTRY_ARRAY_LEN(_name_, str, STRING, _val_, _len_)
 #define PROPERTY_ENTRY_REF_ARRAY_LEN(_name_, _val_, _len_)		\
-	__PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_,			\
-				sizeof(struct software_node_ref_args),	\
-				REF, _val_, _len_)
+(struct property_entry) {						\
+	.name = _name_,							\
+	.length = (_len_) * sizeof(struct software_node_ref_args),	\
+	.type = DEV_PROP_##_Type_,					\
+	{ .pointer = _val_ },						\
+}
 
 #define PROPERTY_ENTRY_U8_ARRAY(_name_, _val_)				\
 	PROPERTY_ENTRY_U8_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
@@ -360,7 +354,7 @@ struct property_entry {
 #define __PROPERTY_ENTRY_ELEMENT(_name_, _elem_, _Type_, _val_)		\
 (struct property_entry) {						\
 	.name = _name_,							\
-	.length = __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_),		\
+	.length = sizeof_field(struct property_entry, value._elem_[0]),	\
 	.is_inline = true,						\
 	.type = DEV_PROP_##_Type_,					\
 	{ .value = { ._elem_[0] = _val_ } },				\
-- 
2.35.1