Merge branch '2023-05-31-cleanup-unaligned-access-macros' into next

To quote the author:

There are two versions of get/set_unaligned, get_unaligned_be64,
put_unaligned_le64 etc in U-Boot causing confusion (and bugs).

In this patch-set, I'm trying to fix that with a single unified version of
the access macros to be used across all archs. This work is inspired by
similar changes in this Linux kernel by Arnd Bergman,
https://lore.kernel.org/lkml/[email protected]/

2 files changed, 73 insertions, 82 deletions

diff --git a/include/asm-generic/unaligned.h b/include/asm-generic/unaligned.h
index 3d33a5a063e..9e5d93ec304 100644
--- a/include/asm-generic/unaligned.h
+++ b/include/asm-generic/unaligned.h
@@ -1,24 +1,81 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _GENERIC_UNALIGNED_H
 #define _GENERIC_UNALIGNED_H
 
 #include <asm/byteorder.h>
 
-#include <linux/unaligned/le_byteshift.h>
-#include <linux/unaligned/be_byteshift.h>
-#include <linux/unaligned/generic.h>
-
-/*
- * Select endianness
- */
-#if defined(__LITTLE_ENDIAN)
-#define get_unaligned	__get_unaligned_le
-#define put_unaligned	__put_unaligned_le
-#elif defined(__BIG_ENDIAN)
-#define get_unaligned	__get_unaligned_be
-#define put_unaligned	__put_unaligned_be
-#else
-#error invalid endian
-#endif
+#define __get_unaligned_t(type, ptr) ({						\
+	const struct { type x; } __packed * __pptr = (typeof(__pptr))(ptr);	\
+	__pptr->x;								\
+})
+
+#define __put_unaligned_t(type, val, ptr) do {					\
+	struct { type x; } __packed * __pptr = (typeof(__pptr))(ptr);		\
+	__pptr->x = (val);							\
+} while (0)
+
+#define get_unaligned(ptr)	__get_unaligned_t(typeof(*(ptr)), (ptr))
+#define put_unaligned(val, ptr) __put_unaligned_t(typeof(*(ptr)), (val), (ptr))
+
+static inline u16 get_unaligned_le16(const void *p)
+{
+	return le16_to_cpu(__get_unaligned_t(__le16, p));
+}
+
+static inline u32 get_unaligned_le32(const void *p)
+{
+	return le32_to_cpu(__get_unaligned_t(__le32, p));
+}
+
+static inline u64 get_unaligned_le64(const void *p)
+{
+	return le64_to_cpu(__get_unaligned_t(__le64, p));
+}
+
+static inline void put_unaligned_le16(u16 val, void *p)
+{
+	__put_unaligned_t(__le16, cpu_to_le16(val), p);
+}
+
+static inline void put_unaligned_le32(u32 val, void *p)
+{
+	__put_unaligned_t(__le32, cpu_to_le32(val), p);
+}
+
+static inline void put_unaligned_le64(u64 val, void *p)
+{
+	__put_unaligned_t(__le64, cpu_to_le64(val), p);
+}
+
+static inline u16 get_unaligned_be16(const void *p)
+{
+	return be16_to_cpu(__get_unaligned_t(__be16, p));
+}
+
+static inline u32 get_unaligned_be32(const void *p)
+{
+	return be32_to_cpu(__get_unaligned_t(__be32, p));
+}
+
+static inline u64 get_unaligned_be64(const void *p)
+{
+	return be64_to_cpu(__get_unaligned_t(__be64, p));
+}
+
+static inline void put_unaligned_be16(u16 val, void *p)
+{
+	__put_unaligned_t(__be16, cpu_to_be16(val), p);
+}
+
+static inline void put_unaligned_be32(u32 val, void *p)
+{
+	__put_unaligned_t(__be32, cpu_to_be32(val), p);
+}
+
+static inline void put_unaligned_be64(u64 val, void *p)
+{
+	__put_unaligned_t(__be64, cpu_to_be64(val), p);
+}
 
 /* Allow unaligned memory access */
 void allow_unaligned(void);
diff --git a/include/linux/unaligned/access_ok.h b/include/linux/unaligned/access_ok.h
deleted file mode 100644
index 5f46eee23c3..00000000000
--- a/include/linux/unaligned/access_ok.h
+++ /dev/null
@@ -1,66 +0,0 @@
-#ifndef _LINUX_UNALIGNED_ACCESS_OK_H
-#define _LINUX_UNALIGNED_ACCESS_OK_H
-
-#include <asm/byteorder.h>
-
-static inline u16 get_unaligned_le16(const void *p)
-{
-	return le16_to_cpup((__le16 *)p);
-}
-
-static inline u32 get_unaligned_le32(const void *p)
-{
-	return le32_to_cpup((__le32 *)p);
-}
-
-static inline u64 get_unaligned_le64(const void *p)
-{
-	return le64_to_cpup((__le64 *)p);
-}
-
-static inline u16 get_unaligned_be16(const void *p)
-{
-	return be16_to_cpup((__be16 *)p);
-}
-
-static inline u32 get_unaligned_be32(const void *p)
-{
-	return be32_to_cpup((__be32 *)p);
-}
-
-static inline u64 get_unaligned_be64(const void *p)
-{
-	return be64_to_cpup((__be64 *)p);
-}
-
-static inline void put_unaligned_le16(u16 val, void *p)
-{
-	*((__le16 *)p) = cpu_to_le16(val);
-}
-
-static inline void put_unaligned_le32(u32 val, void *p)
-{
-	*((__le32 *)p) = cpu_to_le32(val);
-}
-
-static inline void put_unaligned_le64(u64 val, void *p)
-{
-	*((__le64 *)p) = cpu_to_le64(val);
-}
-
-static inline void put_unaligned_be16(u16 val, void *p)
-{
-	*((__be16 *)p) = cpu_to_be16(val);
-}
-
-static inline void put_unaligned_be32(u32 val, void *p)
-{
-	*((__be32 *)p) = cpu_to_be32(val);
-}
-
-static inline void put_unaligned_be64(u64 val, void *p)
-{
-	*((__be64 *)p) = cpu_to_be64(val);
-}
-
-#endif /* _LINUX_UNALIGNED_ACCESS_OK_H */