11.6. Quick Reference
The following symbols were introduced in this chapter:- #include <linux/types.h>
- typedef u8;
- typedef u16;
- typedef u32;
- typedef u64;
Types guaranteed to be 8-, 16-, 32-, and 64-bit unsigned integer
values. The equivalent signed types exist as well. In user space, you
can refer to the types as _ _u8, _
_u16, and so forth.
- #include <asm/page.h>
- PAGE_SIZE
- PAGE_SHIFT
Symbols
that
define the number of bytes per page for the current architecture and
the number of bits in the page offset (12 for 4-KB pages and 13 for
8-KB pages).
- #include <asm/byteorder.h>
- _ _LITTLE_ENDIAN
- _ _BIG_ENDIAN
Only one of the two symbols is defined, depending on the architecture.
- #include <asm/byteorder.h>
- u32 _ _cpu_to_le32 (u32);
- u32 _ _le32_to_cpu (u32);
Functions that convert between known
byte
orders and that of the processor. There are more than 60 such
functions; see the various files in
include/linux/byteorder/ for a full list and the
ways in which they are defined.
- #include <asm/unaligned.h>
- get_unaligned(ptr);
- put_unaligned(val, ptr);
Some architectures need to protect
unaligned data
access using these macros. The macros expand to normal pointer
dereferencing for architectures that permit you to access unaligned
data.
- #include <linux/err.h>
- void *ERR_PTR(long error);
- long PTR_ERR(const void *ptr);
- long IS_ERR(const void *ptr);
Functions allow error codes to be returned by functions that return a
pointer value.
- #include <linux/list.h>
- list_add(struct list_head *new, struct list_head *head);
- list_add_tail(struct list_head *new, struct list_head *head);
- list_del(struct list_head *entry);
- list_del_init(struct list_head *entry);
- list_empty(struct list_head *head);
- list_entry(entry, type, member);
- list_move(struct list_head *entry, struct list_head *head);
- list_move_tail(struct list_head *entry, struct list_head *head);
- list_splice(struct list_head *list, struct list_head *head);
Functions that manipulate circular, doubly linked lists.
- list_for_each(struct list_head *cursor, struct list_head *list)
- list_for_each_prev(struct list_head *cursor, struct list_head *list)
- list_for_each_safe(struct list_head *cursor, struct list_head *next, struct
- list_head *list)
- list_for_each_entry(type *cursor, struct list_head *list, member)
- list_for_each_entry_safe(type *cursor, type *next struct list_head *list,
- member)
Convenience macros for iterating through linked lists.
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