[linux.git] / include / linux / init.h

#ifndef _LINUX_INIT_H
#define _LINUX_INIT_H

#include <linux/compiler.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 const char linux_logo[] __initconst = { 0x32, 0x36, ... };
 *
 * Don't forget to initialize data not at file scope, i.e. within a function,
 * as gcc otherwise puts the data into the bss section and not into the init
 * section.
 * 
 * Also note, that this data cannot be "const".
 */

/* These are for everybody (although not all archs will actually
   discard it in modules) */
#define __init		__section(.init.text) __cold notrace
#define __initdata	__section(.init.data)
#define __initconst	__section(.init.rodata)
#define __exitdata	__section(.exit.data)
#define __exit_call	__used __section(.exitcall.exit)

/* modpost check for section mismatches during the kernel build.
 * A section mismatch happens when there are references from a
 * code or data section to an init section (both code or data).
 * The init sections are (for most archs) discarded by the kernel
 * when early init has completed so all such references are potential bugs.
 * For exit sections the same issue exists.
 * The following markers are used for the cases where the reference to
 * the *init / *exit section (code or data) is valid and will teach
 * modpost not to issue a warning.
 * The markers follow same syntax rules as __init / __initdata. */
#define __ref            __section(.ref.text) noinline
#define __refdata        __section(.ref.data)
#define __refconst       __section(.ref.rodata)

/* compatibility defines */
#define __init_refok     __ref
#define __initdata_refok __refdata
#define __exit_refok     __ref


#ifdef MODULE
#define __exitused
#else
#define __exitused  __used
#endif

#define __exit          __section(.exit.text) __exitused __cold

/* Used for HOTPLUG */
#define __devinit        __section(.devinit.text) __cold
#define __devinitdata    __section(.devinit.data)
#define __devinitconst   __section(.devinit.rodata)
#define __devexit        __section(.devexit.text) __exitused __cold
#define __devexitdata    __section(.devexit.data)
#define __devexitconst   __section(.devexit.rodata)

/* Used for HOTPLUG_CPU */
#define __cpuinit        __section(.cpuinit.text) __cold
#define __cpuinitdata    __section(.cpuinit.data)
#define __cpuinitconst   __section(.cpuinit.rodata)
#define __cpuexit        __section(.cpuexit.text) __exitused __cold
#define __cpuexitdata    __section(.cpuexit.data)
#define __cpuexitconst   __section(.cpuexit.rodata)

/* Used for MEMORY_HOTPLUG */
#define __meminit        __section(.meminit.text) __cold
#define __meminitdata    __section(.meminit.data)
#define __meminitconst   __section(.meminit.rodata)
#define __memexit        __section(.memexit.text) __exitused __cold
#define __memexitdata    __section(.memexit.data)
#define __memexitconst   __section(.memexit.rodata)

/* For assembly routines */
#define __HEAD		.section	".head.text","ax"
#define __INIT		.section	".init.text","ax"
#define __FINIT		.previous

#define __INITDATA	.section	".init.data","aw",%progbits
#define __INITRODATA	.section	".init.rodata","a",%progbits
#define __FINITDATA	.previous

#define __DEVINIT        .section	".devinit.text", "ax"
#define __DEVINITDATA    .section	".devinit.data", "aw"
#define __DEVINITRODATA  .section	".devinit.rodata", "a"

#define __CPUINIT        .section	".cpuinit.text", "ax"
#define __CPUINITDATA    .section	".cpuinit.data", "aw"
#define __CPUINITRODATA  .section	".cpuinit.rodata", "a"

#define __MEMINIT        .section	".meminit.text", "ax"
#define __MEMINITDATA    .section	".meminit.data", "aw"
#define __MEMINITRODATA  .section	".meminit.rodata", "a"

/* silence warnings when references are OK */
#define __REF            .section       ".ref.text", "ax"
#define __REFDATA        .section       ".ref.data", "aw"
#define __REFCONST       .section       ".ref.rodata", "a"

#ifndef __ASSEMBLY__
/*
 * Used for initialization calls..
 */
typedef int (*initcall_t)(void);
typedef void (*exitcall_t)(void);

extern initcall_t __con_initcall_start[], __con_initcall_end[];
extern initcall_t __security_initcall_start[], __security_initcall_end[];

/* Used for contructor calls. */
typedef void (*ctor_fn_t)(void);

/* Defined in init/main.c */
extern int do_one_initcall(initcall_t fn);
extern char __initdata boot_command_line[];
extern char *saved_command_line;
extern unsigned int reset_devices;

/* used by init/main.c */
void setup_arch(char **);
void prepare_namespace(void);

extern void (*late_time_init)(void);

#endif
  
#ifndef MODULE

#ifndef __ASSEMBLY__

/* initcalls are now grouped by functionality into separate 
 * subsections. Ordering inside the subsections is determined
 * by link order. 
 * For backwards compatibility, initcall() puts the call in 
 * the device init subsection.
 *
 * The `id' arg to __define_initcall() is needed so that multiple initcalls
 * can point at the same handler without causing duplicate-symbol build errors.
 */

#define __define_initcall(level,fn,id) \
	static initcall_t __initcall_##fn##id __used \
	__attribute__((__section__(".initcall" level ".init"))) = fn

/*
 * Early initcalls run before initializing SMP.
 *
 * Only for built-in code, not modules.
 */
#define early_initcall(fn)		__define_initcall("early",fn,early)

/*
 * A "pure" initcall has no dependencies on anything else, and purely
 * initializes variables that couldn't be statically initialized.
 *
 * This only exists for built-in code, not for modules.
 */
#define pure_initcall(fn)		__define_initcall("0",fn,0)

#define core_initcall(fn)		__define_initcall("1",fn,1)
#define core_initcall_sync(fn)		__define_initcall("1s",fn,1s)
#define postcore_initcall(fn)		__define_initcall("2",fn,2)
#define postcore_initcall_sync(fn)	__define_initcall("2s",fn,2s)
#define arch_initcall(fn)		__define_initcall("3",fn,3)
#define arch_initcall_sync(fn)		__define_initcall("3s",fn,3s)
#define subsys_initcall(fn)		__define_initcall("4",fn,4)
#define subsys_initcall_sync(fn)	__define_initcall("4s",fn,4s)
#define fs_initcall(fn)			__define_initcall("5",fn,5)
#define fs_initcall_sync(fn)		__define_initcall("5s",fn,5s)
#define rootfs_initcall(fn)		__define_initcall("rootfs",fn,rootfs)
#define device_initcall(fn)		__define_initcall("6",fn,6)
#define device_initcall_sync(fn)	__define_initcall("6s",fn,6s)
#define late_initcall(fn)		__define_initcall("7",fn,7)
#define late_initcall_sync(fn)		__define_initcall("7s",fn,7s)

#define __initcall(fn) device_initcall(fn)

#define __exitcall(fn) \
	static exitcall_t __exitcall_##fn __exit_call = fn

#define console_initcall(fn) \
	static initcall_t __initcall_##fn \
	__used __section(.con_initcall.init) = fn

#define security_initcall(fn) \
	static initcall_t __initcall_##fn \
	__used __section(.security_initcall.init) = fn

struct obs_kernel_param {
	const char *str;
	int (*setup_func)(char *);
	int early;
};

/*
 * Only for really core code.  See moduleparam.h for the normal way.
 *
 * Force the alignment so the compiler doesn't space elements of the
 * obs_kernel_param "array" too far apart in .init.setup.
 */
#define __setup_param(str, unique_id, fn, early)			\
	static const char __setup_str_##unique_id[] __initconst	\
		__aligned(1) = str; \
	static struct obs_kernel_param __setup_##unique_id	\
		__used __section(.init.setup)			\
		__attribute__((aligned((sizeof(long)))))	\
		= { __setup_str_##unique_id, fn, early }

#define __setup(str, fn)					\
	__setup_param(str, fn, fn, 0)

/* NOTE: fn is as per module_param, not __setup!  Emits warning if fn
 * returns non-zero. */
#define early_param(str, fn)					\
	__setup_param(str, fn, fn, 1)

/* Relies on boot_command_line being set */
void __init parse_early_param(void);
void __init parse_early_options(char *cmdline);
#endif /* __ASSEMBLY__ */

/**
 * module_init() - driver initialization entry point
 * @x: function to be run at kernel boot time or module insertion
 * 
 * module_init() will either be called during do_initcalls() (if
 * builtin) or at module insertion time (if a module).  There can only
 * be one per module.
 */
#define module_init(x)	__initcall(x);

/**
 * module_exit() - driver exit entry point
 * @x: function to be run when driver is removed
 * 
 * module_exit() will wrap the driver clean-up code
 * with cleanup_module() when used with rmmod when
 * the driver is a module.  If the driver is statically
 * compiled into the kernel, module_exit() has no effect.
 * There can only be one per module.
 */
#define module_exit(x)	__exitcall(x);

#else /* MODULE */

/* Don't use these in modules, but some people do... */
#define core_initcall(fn)		module_init(fn)
#define postcore_initcall(fn)		module_init(fn)
#define arch_initcall(fn)		module_init(fn)
#define subsys_initcall(fn)		module_init(fn)
#define fs_initcall(fn)			module_init(fn)
#define device_initcall(fn)		module_init(fn)
#define late_initcall(fn)		module_init(fn)

#define security_initcall(fn)		module_init(fn)

/* Each module must use one module_init(). */
#define module_init(initfn)					\
	static inline initcall_t __inittest(void)		\
	{ return initfn; }					\
	int init_module(void) __attribute__((alias(#initfn)));

/* This is only required if you want to be unloadable. */
#define module_exit(exitfn)					\
	static inline exitcall_t __exittest(void)		\
	{ return exitfn; }					\
	void cleanup_module(void) __attribute__((alias(#exitfn)));

#define __setup_param(str, unique_id, fn)	/* nothing */
#define __setup(str, func) 			/* nothing */
#endif

/* Data marked not to be saved by software suspend */
#define __nosavedata __section(.data.nosave)

/* This means "can be init if no module support, otherwise module load
   may call it." */
#ifdef CONFIG_MODULES
#define __init_or_module
#define __initdata_or_module
#define __initconst_or_module
#define __INIT_OR_MODULE	.text
#define __INITDATA_OR_MODULE	.data
#define __INITRODATA_OR_MODULE	.section ".rodata","a",%progbits
#else
#define __init_or_module __init
#define __initdata_or_module __initdata
#define __initconst_or_module __initconst
#define __INIT_OR_MODULE __INIT
#define __INITDATA_OR_MODULE __INITDATA
#define __INITRODATA_OR_MODULE __INITRODATA
#endif /*CONFIG_MODULES*/

/* Functions marked as __devexit may be discarded at kernel link time, depending
   on config options.  Newer versions of binutils detect references from
   retained sections to discarded sections and flag an error.  Pointers to
   __devexit functions must use __devexit_p(function_name), the wrapper will
   insert either the function_name or NULL, depending on the config options.
 */
#if defined(MODULE) || defined(CONFIG_HOTPLUG)
#define __devexit_p(x) x
#else
#define __devexit_p(x) NULL
#endif

#ifdef MODULE
#define __exit_p(x) x
#else
#define __exit_p(x) NULL
#endif

#endif /* _LINUX_INIT_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_INIT_H
	2	#define _LINUX_INIT_H
	3
1da177e4 LT	4	#include <linux/compiler.h>
	5
	6	/* These macros are used to mark some functions or
	7	* initialized data (doesn't apply to uninitialized data)
	8	* as `initialization' functions. The kernel can take this
	9	* as hint that the function is used only during the initialization
	10	* phase and free up used memory resources after
	11	*
	12	* Usage:
	13	* For functions:
	14	*
	15	* You should add __init immediately before the function name, like:
	16	*
	17	* static void __init initme(int x, int y)
	18	* {
	19	* extern int z; z = x * y;
	20	* }
	21	*
	22	* If the function has a prototype somewhere, you can also add
	23	* __init between closing brace of the prototype and semicolon:
	24	*
	25	* extern int initialize_foobar_device(int, int, int) __init;
	26	*
	27	* For initialized data:
	28	* You should insert __initdata between the variable name and equal
	29	* sign followed by value, e.g.:
	30	*
	31	* static int init_variable __initdata = 0;
ae52bb23	32	* static const char linux_logo[] __initconst = { 0x32, 0x36, ... };
1da177e4 LT	33	*
	34	* Don't forget to initialize data not at file scope, i.e. within a function,
	35	* as gcc otherwise puts the data into the bss section and not into the init
	36	* section.
	37	*
	38	* Also note, that this data cannot be "const".
	39	*/
	40
	41	/* These are for everybody (although not all archs will actually
	42	discard it in modules) */
fed1939c	43	#define __init __section(.init.text) __cold notrace
f3fe866d	44	#define __initdata __section(.init.data)
37c514e3	45	#define __initconst __section(.init.rodata)
f3fe866d	46	#define __exitdata __section(.exit.data)
3ff6eecc	47	#define __exit_call __used __section(.exitcall.exit)
1da177e4	48
0e0d314e SR	49	/* modpost check for section mismatches during the kernel build.
	50	* A section mismatch happens when there are references from a
	51	* code or data section to an init section (both code or data).
	52	* The init sections are (for most archs) discarded by the kernel
	53	* when early init has completed so all such references are potential bugs.
	54	* For exit sections the same issue exists.
	55	* The following markers are used for the cases where the reference to
312b1485 SR	56	* the init / exit section (code or data) is valid and will teach
312b1485 SR	57	* modpost not to issue a warning.
0e0d314e	58	* The markers follow same syntax rules as __init / __initdata. */
312b1485 SR	59	#define __ref __section(.ref.text) noinline
	60	#define __refdata __section(.ref.data)
	61	#define __refconst __section(.ref.rodata)
	62
312b1485 SR	63	/* compatibility defines */
	64	#define __init_refok __ref
	65	#define __initdata_refok __refdata
	66	#define __exit_refok __ref
	67
0e0d314e	68
1da177e4	69	#ifdef MODULE
eb8f6890	70	#define __exitused
1da177e4	71	#else
eb8f6890	72	#define __exitused __used
1da177e4 LT	73	#endif
1da177e4 LT	74
eb8f6890 SR	75	#define __exit __section(.exit.text) __exitused __cold
	76
	77	/* Used for HOTPLUG */
	78	#define __devinit __section(.devinit.text) __cold
	79	#define __devinitdata __section(.devinit.data)
	80	#define __devinitconst __section(.devinit.rodata)
	81	#define __devexit __section(.devexit.text) __exitused __cold
	82	#define __devexitdata __section(.devexit.data)
	83	#define __devexitconst __section(.devexit.rodata)
	84
	85	/* Used for HOTPLUG_CPU */
	86	#define __cpuinit __section(.cpuinit.text) __cold
	87	#define __cpuinitdata __section(.cpuinit.data)
	88	#define __cpuinitconst __section(.cpuinit.rodata)
	89	#define __cpuexit __section(.cpuexit.text) __exitused __cold
	90	#define __cpuexitdata __section(.cpuexit.data)
	91	#define __cpuexitconst __section(.cpuexit.rodata)
	92
	93	/* Used for MEMORY_HOTPLUG */
	94	#define __meminit __section(.meminit.text) __cold
	95	#define __meminitdata __section(.meminit.data)
	96	#define __meminitconst __section(.meminit.rodata)
	97	#define __memexit __section(.memexit.text) __exitused __cold
	98	#define __memexitdata __section(.memexit.data)
	99	#define __memexitconst __section(.memexit.rodata)
	100
1da177e4	101	/* For assembly routines */
7923f90f	102	#define __HEAD .section ".head.text","ax"
1da177e4	103	#define __INIT .section ".init.text","ax"
86c0baf1	104	#define __FINIT .previous
eb8f6890	105
8b5a10fc JB	106	#define __INITDATA .section ".init.data","aw",%progbits
8b5a10fc JB	107	#define __INITRODATA .section ".init.rodata","a",%progbits
9f9975a5	108	#define __FINITDATA .previous
1da177e4	109
eb8f6890 SR	110	#define __DEVINIT .section ".devinit.text", "ax"
eb8f6890 SR	111	#define __DEVINITDATA .section ".devinit.data", "aw"
3f5e26ce	112	#define __DEVINITRODATA .section ".devinit.rodata", "a"
eb8f6890 SR	113
	114	#define __CPUINIT .section ".cpuinit.text", "ax"
	115	#define __CPUINITDATA .section ".cpuinit.data", "aw"
3f5e26ce	116	#define __CPUINITRODATA .section ".cpuinit.rodata", "a"
eb8f6890 SR	117
	118	#define __MEMINIT .section ".meminit.text", "ax"
	119	#define __MEMINITDATA .section ".meminit.data", "aw"
3f5e26ce	120	#define __MEMINITRODATA .section ".meminit.rodata", "a"
eb8f6890	121
312b1485 SR	122	/* silence warnings when references are OK */
	123	#define __REF .section ".ref.text", "ax"
	124	#define __REFDATA .section ".ref.data", "aw"
3f5e26ce	125	#define __REFCONST .section ".ref.rodata", "a"
312b1485	126
1da177e4 LT	127	#ifndef __ASSEMBLY__
	128	/*
	129	* Used for initialization calls..
	130	*/
	131	typedef int (*initcall_t)(void);
	132	typedef void (*exitcall_t)(void);
	133
	134	extern initcall_t __con_initcall_start[], __con_initcall_end[];
	135	extern initcall_t __security_initcall_start[], __security_initcall_end[];
	136
b99b87f7 PO	137	/* Used for contructor calls. */
	138	typedef void (*ctor_fn_t)(void);
	139
1da177e4	140	/* Defined in init/main.c */
59f9415f	141	extern int do_one_initcall(initcall_t fn);
30d7e0d4 ABL	142	extern char __initdata boot_command_line[];
30d7e0d4 ABL	143	extern char *saved_command_line;
7e96287d	144	extern unsigned int reset_devices;
77d47582 AB	145
77d47582 AB	146	/* used by init/main.c */
46595390 AB	147	void setup_arch(char **);
46595390 AB	148	void prepare_namespace(void);
77d47582	149
7d195a54 AB	150	extern void (*late_time_init)(void);
7d195a54 AB	151
1da177e4 LT	152	#endif
	153
	154	#ifndef MODULE
	155
	156	#ifndef __ASSEMBLY__
	157
	158	/* initcalls are now grouped by functionality into separate
	159	* subsections. Ordering inside the subsections is determined
	160	* by link order.
	161	* For backwards compatibility, initcall() puts the call in
	162	* the device init subsection.
735a7ffb AM	163	*
	164	* The `id' arg to __define_initcall() is needed so that multiple initcalls
	165	* can point at the same handler without causing duplicate-symbol build errors.
1da177e4 LT	166	*/
1da177e4 LT	167
735a7ffb	168	#define __define_initcall(level,fn,id) \
3ff6eecc	169	static initcall_t __initcall_##fn##id __used \
1da177e4 LT	170	__attribute__((__section__(".initcall" level ".init"))) = fn
1da177e4 LT	171
c2147a50 EGM	172	/*
	173	* Early initcalls run before initializing SMP.
	174	*
	175	* Only for built-in code, not modules.
	176	*/
	177	#define early_initcall(fn) __define_initcall("early",fn,early)
	178
b3438f82 LT	179	/*
	180	* A "pure" initcall has no dependencies on anything else, and purely
	181	* initializes variables that couldn't be statically initialized.
	182	*
	183	* This only exists for built-in code, not for modules.
	184	*/
73dd1166	185	#define pure_initcall(fn) __define_initcall("0",fn,0)
b3438f82	186
735a7ffb AM	187	#define core_initcall(fn) __define_initcall("1",fn,1)
	188	#define core_initcall_sync(fn) __define_initcall("1s",fn,1s)
	189	#define postcore_initcall(fn) __define_initcall("2",fn,2)
	190	#define postcore_initcall_sync(fn) __define_initcall("2s",fn,2s)
	191	#define arch_initcall(fn) __define_initcall("3",fn,3)
	192	#define arch_initcall_sync(fn) __define_initcall("3s",fn,3s)
	193	#define subsys_initcall(fn) __define_initcall("4",fn,4)
	194	#define subsys_initcall_sync(fn) __define_initcall("4s",fn,4s)
	195	#define fs_initcall(fn) __define_initcall("5",fn,5)
	196	#define fs_initcall_sync(fn) __define_initcall("5s",fn,5s)
8d610dd5	197	#define rootfs_initcall(fn) __define_initcall("rootfs",fn,rootfs)
735a7ffb AM	198	#define device_initcall(fn) __define_initcall("6",fn,6)
	199	#define device_initcall_sync(fn) __define_initcall("6s",fn,6s)
	200	#define late_initcall(fn) __define_initcall("7",fn,7)
	201	#define late_initcall_sync(fn) __define_initcall("7s",fn,7s)
1da177e4 LT	202
	203	#define __initcall(fn) device_initcall(fn)
	204
	205	#define __exitcall(fn) \
	206	static exitcall_t __exitcall_##fn __exit_call = fn
	207
	208	#define console_initcall(fn) \
	209	static initcall_t __initcall_##fn \
3ff6eecc	210	__used __section(.con_initcall.init) = fn
1da177e4 LT	211
	212	#define security_initcall(fn) \
	213	static initcall_t __initcall_##fn \
3ff6eecc	214	__used __section(.security_initcall.init) = fn
1da177e4 LT	215
	216	struct obs_kernel_param {
	217	const char *str;
	218	int (setup_func)(char );
	219	int early;
	220	};
	221
	222	/*
	223	* Only for really core code. See moduleparam.h for the normal way.
	224	*
	225	* Force the alignment so the compiler doesn't space elements of the
	226	* obs_kernel_param "array" too far apart in .init.setup.
	227	*/
	228	#define __setup_param(str, unique_id, fn, early) \
fd6c3a8d JB	229	static const char __setup_str_##unique_id[] __initconst \
fd6c3a8d JB	230	__aligned(1) = str; \
1da177e4	231	static struct obs_kernel_param __setup_##unique_id \
3ff6eecc	232	__used __section(.init.setup) \
1da177e4 LT	233	__attribute__((aligned((sizeof(long))))) \
	234	= { __setup_str_##unique_id, fn, early }
	235
1da177e4 LT	236	#define __setup(str, fn) \
	237	__setup_param(str, fn, fn, 0)
	238
1da177e4 LT	239	/* NOTE: fn is as per module_param, not __setup! Emits warning if fn
	240	* returns non-zero. */
	241	#define early_param(str, fn) \
	242	__setup_param(str, fn, fn, 1)
	243
30d7e0d4	244	/* Relies on boot_command_line being set */
1da177e4	245	void __init parse_early_param(void);
13977091	246	void __init parse_early_options(char *cmdline);
1da177e4 LT	247	#endif /* __ASSEMBLY__ */
	248
	249	/**
	250	* module_init() - driver initialization entry point
	251	* @x: function to be run at kernel boot time or module insertion
	252	*
72fd4a35	253	* module_init() will either be called during do_initcalls() (if
1da177e4 LT	254	* builtin) or at module insertion time (if a module). There can only
	255	* be one per module.
	256	*/
	257	#define module_init(x) __initcall(x);
	258
	259	/**
	260	* module_exit() - driver exit entry point
	261	* @x: function to be run when driver is removed
	262	*
	263	* module_exit() will wrap the driver clean-up code
	264	* with cleanup_module() when used with rmmod when
	265	* the driver is a module. If the driver is statically
	266	* compiled into the kernel, module_exit() has no effect.
	267	* There can only be one per module.
	268	*/
	269	#define module_exit(x) __exitcall(x);
	270
	271	#else /* MODULE */
	272
	273	/* Don't use these in modules, but some people do... */
	274	#define core_initcall(fn) module_init(fn)
	275	#define postcore_initcall(fn) module_init(fn)
	276	#define arch_initcall(fn) module_init(fn)
	277	#define subsys_initcall(fn) module_init(fn)
	278	#define fs_initcall(fn) module_init(fn)
	279	#define device_initcall(fn) module_init(fn)
	280	#define late_initcall(fn) module_init(fn)
	281
	282	#define security_initcall(fn) module_init(fn)
	283
4500d067	284	/* Each module must use one module_init(). */
1da177e4 LT	285	#define module_init(initfn) \
	286	static inline initcall_t __inittest(void) \
	287	{ return initfn; } \
	288	int init_module(void) __attribute__((alias(#initfn)));
	289
	290	/* This is only required if you want to be unloadable. */
	291	#define module_exit(exitfn) \
	292	static inline exitcall_t __exittest(void) \
	293	{ return exitfn; } \
	294	void cleanup_module(void) __attribute__((alias(#exitfn)));
	295
	296	#define __setup_param(str, unique_id, fn) /* nothing */
1da177e4	297	#define __setup(str, func) /* nothing */
1da177e4 LT	298	#endif
1da177e4 LT	299
ab3bfca7	300	/* Data marked not to be saved by software suspend */
f3fe866d	301	#define __nosavedata __section(.data.nosave)
1da177e4 LT	302
	303	/* This means "can be init if no module support, otherwise module load
	304	may call it." */
	305	#ifdef CONFIG_MODULES
	306	#define __init_or_module
	307	#define __initdata_or_module
8b5a10fc JB	308	#define __initconst_or_module
	309	#define __INIT_OR_MODULE .text
	310	#define __INITDATA_OR_MODULE .data
	311	#define __INITRODATA_OR_MODULE .section ".rodata","a",%progbits
1da177e4 LT	312	#else
	313	#define __init_or_module __init
	314	#define __initdata_or_module __initdata
8b5a10fc JB	315	#define __initconst_or_module __initconst
	316	#define __INIT_OR_MODULE __INIT
	317	#define __INITDATA_OR_MODULE __INITDATA
	318	#define __INITRODATA_OR_MODULE __INITRODATA
1da177e4 LT	319	#endif /CONFIG_MODULES/
1da177e4 LT	320
1da177e4 LT	321	/* Functions marked as __devexit may be discarded at kernel link time, depending
	322	on config options. Newer versions of binutils detect references from
	323	retained sections to discarded sections and flag an error. Pointers to
	324	__devexit functions must use __devexit_p(function_name), the wrapper will
	325	insert either the function_name or NULL, depending on the config options.
	326	*/
	327	#if defined(MODULE) \|\| defined(CONFIG_HOTPLUG)
	328	#define __devexit_p(x) x
	329	#else
	330	#define __devexit_p(x) NULL
	331	#endif
	332
	333	#ifdef MODULE
	334	#define __exit_p(x) x
	335	#else
	336	#define __exit_p(x) NULL
	337	#endif
	338
	339	#endif /* _LINUX_INIT_H */