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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 | #ifndef _LINUX_INIT_H
#define _LINUX_INIT_H
/* These macros are used to mark some functions or
* initialized data (doesn't apply to uninitialized data)
* as `initialization' functions. The kernel can take this
* as hint that the function is used only during the initialization
* phase and free up used memory resources after
*
* Usage:
* For functions:
*
* You should add __init immediately before the function name, like:
*
* static void __init initme(int x, int y)
* {
* extern int z; z = x * y;
* }
*
* If the function has a prototype somewhere, you can also add
* __init between closing brace of the prototype and semicolon:
*
* extern int initialize_foobar_device(int, int, int) __init;
*
* For initialized data:
* You should insert __initdata between the variable name and equal
* sign followed by value, e.g.:
*
* static int init_variable __initdata = 0;
* static char linux_logo[] __initdata = { 0x32, 0x36, ... };
*
* For initialized data not at file scope, i.e. within a function,
* you should use __initlocaldata instead, due to a bug in GCC 2.7.
*/
#ifndef MODULE
#ifndef __ASSEMBLY__
/*
* Used for initialization calls..
*/
typedef int (*initcall_t)(void);
extern initcall_t __initcall_start, __initcall_end;
#define __initcall(fn) \
static initcall_t __initcall_##fn __init_call = fn
/*
* Used for kernel command line parameter setup
*/
struct kernel_param {
const char *str;
int (*setup_func)(char *);
};
extern struct kernel_param __setup_start, __setup_end;
#define __setup(str, fn) \
static char __setup_str_##fn[] __initdata = str; \
static struct kernel_param __setup_##fn __initsetup = { __setup_str_##fn, fn }
#endif /* __ASSEMBLY__ */
/*
* Mark functions and data as being only used at initialization
* or exit time.
*/
#define __init __attribute__ ((__section__ (".text.init")))
#define __exit __attribute__ ((unused, __section__(".text.init")))
#define __initdata __attribute__ ((__section__ (".data.init")))
#define __exitdata __attribute__ ((unused, __section__ (".data.init")))
#define __initsetup __attribute__ ((unused,__section__ (".setup.init")))
#define __init_call __attribute__ ((unused,__section__ (".initcall.init")))
/* For assembly routines */
#define __INIT .section ".text.init","ax"
#define __FINIT .previous
#define __INITDATA .section ".data.init","aw"
#define module_init(x) __initcall(x);
#define module_exit(x) /* nothing */
#else
#define __init
#define __exit
#define __initdata
#define __exitdata
#define __initcall
/* For assembly routines */
#define __INIT
#define __FINIT
#define __INITDATA
/* Not sure what version aliases were introduced in, but certainly in 2.95. */
#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)
#define module_init(x) int init_module(void) __attribute__((alias(#x)));
#define module_exit(x) void cleanup_module(void) __attribute__((alias(#x)));
#else
#define module_init(x) int init_module(void) { return x(); }
#define module_exit(x) void cleanup_module(void) { x(); }
#endif
#endif
#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8)
#define __initlocaldata __initdata
#else
#define __initlocaldata
#endif
#endif
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