Messages in this thread Patch in this message | | | Subject | [PATCH] kernel: create linux/unaligned.h | From | Harvey Harrison <> | Date | Thu, 20 Mar 2008 13:16:57 -0700 |
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Add helpers for the following two patterns currently found in the kernel:
le32_to_cpu(get_unaligned((__le32 *)p)); put_unaligned(cpu_to_le32(x), (__le32 *)p);
Becomes: le32_to_cpu_unaligned(p); cpu_to_le32_unaligned(x, p);
There are also some hand-rolled functions implementing this with byte-shifts that can be replaced. To avoid new indirect includes of asm/unaligned.h, create linux/unaligned.h to make it opt in for new code that wants to use these helpers.
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> --- This is a rollup of all the previous ones, added kerneldocs and have CC'd Randy.
include/linux/unaligned.h | 138 +++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 138 insertions(+), 0 deletions(-)
diff --git a/include/linux/unaligned.h b/include/linux/unaligned.h new file mode 100644 index 0000000..035c1c7 --- /dev/null +++ b/include/linux/unaligned.h @@ -0,0 +1,138 @@ +#ifndef _LINUX_UNALIGNED_H_ +#define _LINUX_UNALIGNED_H_ + +#include <linux/types.h> +#include <asm/byteorder.h> +#include <asm/unaligned.h> + +#ifdef __KERNEL__ + +/** + * le64_to_cpu_unaligned - read a le64 from a possibly unaligned pointer + * @p: pointer to read from + * + * Returns a u64 in cpu byteorder + */ +static inline u64 le64_to_cpu_unaligned(void *p) +{ + return le64_to_cpu(get_unaligned((__le64 *)p)); +} + +/** + * le32_to_cpu_unaligned - read a le32 from a possibly unaligned pointer + * @p: pointer to read from + * + * Returns a u32 in cpu byteorder + */ +static inline u32 le32_to_cpu_unaligned(void *p) +{ + return le32_to_cpu(get_unaligned((__le32 *)p)); +} + +/** + * le16_to_cpu_unaligned - read a le16 from a possibly unaligned pointer + * @p: pointer to read from + * + * Returns a u16 in cpu byteorder + */ +static inline u16 le16_to_cpu_unaligned(void *p) +{ + return le16_to_cpu(get_unaligned((__le16 *)p)); +} + +/** + * be64_to_cpu_unaligned - read a be64 from a possibly unaligned pointer + * @p: pointer to read from + * + * Returns a u64 in cpu byteorder + */ +static inline u64 be64_to_cpu_unaligned(void *p) +{ + return be64_to_cpu(get_unaligned((__be64 *)p)); +} + +/** + * be32_to_cpu_unaligned - read a be32 from a possibly unaligned pointer + * @p: pointer to read from + * + * Returns a u32 in cpu byteorder + */ +static inline u32 be32_to_cpu_unaligned(void *p) +{ + return be32_to_cpu(get_unaligned((__be32 *)p)); +} + +/** + * be16_to_cpu_unaligned - read a be16 from a possibly unaligned pointer + * @p: pointer to read from + * + * Returns a u16 in cpu byteorder + */ +static inline u16 be16_to_cpu_unaligned(void *p) +{ + return be16_to_cpu(get_unaligned((__be16 *)p)); +} + +/** + * le64_to_cpu_unaligned - write a u64 in le-byteorder to a possibly unaligned pointer + * @val: value to be written + * @p: pointer to write to + */ +static inline void cpu_to_le64_unaligned(u64 val, void *p) +{ + put_unaligned(cpu_to_le64(val), (__le64 *)p); +} + +/** + * le32_to_cpu_unaligned - write a u32 in le-byteorder to a possibly unaligned pointer + * @val: value to be written + * @p: pointer to write to + */ +static inline void cpu_to_le32_unaligned(u32 val, void *p) +{ + put_unaligned(cpu_to_le32(val), (__le32 *)p); +} + +/** + * le16_to_cpu_unaligned - write a u16 in le-byteorder to a possibly unaligned pointer + * @val: value to be written + * @p: pointer to write to + */ +static inline void cpu_to_le16_unaligned(u16 val, void *p) +{ + put_unaligned(cpu_to_le16(val), (__le16 *)p); +} + +/** + * be64_to_cpu_unaligned - write a u64 in be-byteorder to a possibly unaligned pointer + * @val: value to be written + * @p: pointer to write to + */ +static inline void cpu_to_be64_unaligned(u64 val, void *p) +{ + put_unaligned(cpu_to_be64(val), (__be64 *)p); +} + +/** + * be32_to_cpu_unaligned - write a u32 in be-byteorder to a possibly unaligned pointer + * @val: value to be written + * @p: pointer to write to + */ +static inline void cpu_to_be32_unaligned(u32 val, void *p) +{ + put_unaligned(cpu_to_be32(val), (__be32 *)p); +} + +/** + * be16_to_cpu_unaligned - write a u16 in be-byteorder to a possibly unaligned pointer + * @val: value to be written + * @p: pointer to write to + */ +static inline void cpu_to_be16_unaligned(u16 val, void *p) +{ + put_unaligned(cpu_to_be16(val), (__be16 *)p); +} + +#endif /* KERNEL */ + +#endif /* _LINUX_UNALIGNED_H */ -- 1.5.4.4.684.g0e08
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