[deliverable/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 char linux_logo[] __initdata = { 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
#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)

/* backward compatibility note
 *  A few places hardcode the old section names:
 *  .text.init.refok
 *  .data.init.refok
 *  .exit.text.refok
 *  They should be converted to use the defines from this file
 */

/* 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"
#define __FINITDATA	.previous

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

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

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

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

#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[];

/* 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 char __setup_str_##unique_id[] __initdata __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_null_param(str, unique_id)			\
	__setup_param(str, unique_id, NULL, 0)

#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);
#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_null_param(str, unique_id) 	/* 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
#else
#define __init_or_module __init
#define __initdata_or_module __initdata
#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;
	32	* static char linux_logo[] __initdata = { 0x32, 0x36, ... };
	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) */
f3fe866d SR	43	#define __init __section(.init.text) __cold
f3fe866d SR	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
	63	/* backward compatibility note
	64	* A few places hardcode the old section names:
	65	* .text.init.refok
	66	* .data.init.refok
	67	* .exit.text.refok
	68	* They should be converted to use the defines from this file
	69	*/
	70
	71	/* compatibility defines */
	72	#define __init_refok __ref
	73	#define __initdata_refok __refdata
	74	#define __exit_refok __ref
	75
0e0d314e	76
1da177e4	77	#ifdef MODULE
eb8f6890	78	#define __exitused
1da177e4	79	#else
eb8f6890	80	#define __exitused __used
1da177e4 LT	81	#endif
1da177e4 LT	82
eb8f6890 SR	83	#define __exit __section(.exit.text) __exitused __cold
	84
	85	/* Used for HOTPLUG */
	86	#define __devinit __section(.devinit.text) __cold
	87	#define __devinitdata __section(.devinit.data)
	88	#define __devinitconst __section(.devinit.rodata)
	89	#define __devexit __section(.devexit.text) __exitused __cold
	90	#define __devexitdata __section(.devexit.data)
	91	#define __devexitconst __section(.devexit.rodata)
	92
	93	/* Used for HOTPLUG_CPU */
	94	#define __cpuinit __section(.cpuinit.text) __cold
	95	#define __cpuinitdata __section(.cpuinit.data)
	96	#define __cpuinitconst __section(.cpuinit.rodata)
	97	#define __cpuexit __section(.cpuexit.text) __exitused __cold
	98	#define __cpuexitdata __section(.cpuexit.data)
	99	#define __cpuexitconst __section(.cpuexit.rodata)
	100
	101	/* Used for MEMORY_HOTPLUG */
	102	#define __meminit __section(.meminit.text) __cold
	103	#define __meminitdata __section(.meminit.data)
	104	#define __meminitconst __section(.meminit.rodata)
	105	#define __memexit __section(.memexit.text) __exitused __cold
	106	#define __memexitdata __section(.memexit.data)
	107	#define __memexitconst __section(.memexit.rodata)
	108
1da177e4	109	/* For assembly routines */
37c514e3	110	#define __HEAD .section ".head.text","ax"
1da177e4	111	#define __INIT .section ".init.text","ax"
86c0baf1	112	#define __FINIT .previous
eb8f6890	113
838c4118	114	#define __INITDATA .section ".init.data","aw"
9f9975a5	115	#define __FINITDATA .previous
1da177e4	116
eb8f6890 SR	117	#define __DEVINIT .section ".devinit.text", "ax"
	118	#define __DEVINITDATA .section ".devinit.data", "aw"
	119
	120	#define __CPUINIT .section ".cpuinit.text", "ax"
	121	#define __CPUINITDATA .section ".cpuinit.data", "aw"
	122
	123	#define __MEMINIT .section ".meminit.text", "ax"
	124	#define __MEMINITDATA .section ".meminit.data", "aw"
	125
312b1485 SR	126	/* silence warnings when references are OK */
	127	#define __REF .section ".ref.text", "ax"
	128	#define __REFDATA .section ".ref.data", "aw"
	129	#define __REFCONST .section ".ref.rodata", "aw"
312b1485	130
1da177e4 LT	131	#ifndef __ASSEMBLY__
	132	/*
	133	* Used for initialization calls..
	134	*/
	135	typedef int (*initcall_t)(void);
	136	typedef void (*exitcall_t)(void);
	137
	138	extern initcall_t __con_initcall_start[], __con_initcall_end[];
	139	extern initcall_t __security_initcall_start[], __security_initcall_end[];
	140
	141	/* Defined in init/main.c */
59f9415f	142	extern int do_one_initcall(initcall_t fn);
30d7e0d4 ABL	143	extern char __initdata boot_command_line[];
30d7e0d4 ABL	144	extern char *saved_command_line;
7e96287d	145	extern unsigned int reset_devices;
77d47582 AB	146
77d47582 AB	147	/* used by init/main.c */
46595390 AB	148	void setup_arch(char **);
46595390 AB	149	void prepare_namespace(void);
77d47582	150
7d195a54 AB	151	extern void (*late_time_init)(void);
7d195a54 AB	152
1da177e4 LT	153	#endif
	154
	155	#ifndef MODULE
	156
	157	#ifndef __ASSEMBLY__
	158
	159	/* initcalls are now grouped by functionality into separate
	160	* subsections. Ordering inside the subsections is determined
	161	* by link order.
	162	* For backwards compatibility, initcall() puts the call in
	163	* the device init subsection.
735a7ffb AM	164	*
	165	* The `id' arg to __define_initcall() is needed so that multiple initcalls
	166	* can point at the same handler without causing duplicate-symbol build errors.
1da177e4 LT	167	*/
1da177e4 LT	168
735a7ffb	169	#define __define_initcall(level,fn,id) \
3ff6eecc	170	static initcall_t __initcall_##fn##id __used \
1da177e4 LT	171	__attribute__((__section__(".initcall" level ".init"))) = fn
1da177e4 LT	172
c2147a50 EGM	173	/*
	174	* Early initcalls run before initializing SMP.
	175	*
	176	* Only for built-in code, not modules.
	177	*/
	178	#define early_initcall(fn) __define_initcall("early",fn,early)
	179
b3438f82 LT	180	/*
	181	* A "pure" initcall has no dependencies on anything else, and purely
	182	* initializes variables that couldn't be statically initialized.
	183	*
	184	* This only exists for built-in code, not for modules.
	185	*/
73dd1166	186	#define pure_initcall(fn) __define_initcall("0",fn,0)
b3438f82	187
735a7ffb AM	188	#define core_initcall(fn) __define_initcall("1",fn,1)
	189	#define core_initcall_sync(fn) __define_initcall("1s",fn,1s)
	190	#define postcore_initcall(fn) __define_initcall("2",fn,2)
	191	#define postcore_initcall_sync(fn) __define_initcall("2s",fn,2s)
	192	#define arch_initcall(fn) __define_initcall("3",fn,3)
	193	#define arch_initcall_sync(fn) __define_initcall("3s",fn,3s)
	194	#define subsys_initcall(fn) __define_initcall("4",fn,4)
	195	#define subsys_initcall_sync(fn) __define_initcall("4s",fn,4s)
	196	#define fs_initcall(fn) __define_initcall("5",fn,5)
	197	#define fs_initcall_sync(fn) __define_initcall("5s",fn,5s)
8d610dd5	198	#define rootfs_initcall(fn) __define_initcall("rootfs",fn,rootfs)
735a7ffb AM	199	#define device_initcall(fn) __define_initcall("6",fn,6)
	200	#define device_initcall_sync(fn) __define_initcall("6s",fn,6s)
	201	#define late_initcall(fn) __define_initcall("7",fn,7)
	202	#define late_initcall_sync(fn) __define_initcall("7s",fn,7s)
1da177e4 LT	203
	204	#define __initcall(fn) device_initcall(fn)
	205
	206	#define __exitcall(fn) \
	207	static exitcall_t __exitcall_##fn __exit_call = fn
	208
	209	#define console_initcall(fn) \
	210	static initcall_t __initcall_##fn \
3ff6eecc	211	__used __section(.con_initcall.init) = fn
1da177e4 LT	212
	213	#define security_initcall(fn) \
	214	static initcall_t __initcall_##fn \
3ff6eecc	215	__used __section(.security_initcall.init) = fn
1da177e4 LT	216
	217	struct obs_kernel_param {
	218	const char *str;
	219	int (setup_func)(char );
	220	int early;
	221	};
	222
	223	/*
	224	* Only for really core code. See moduleparam.h for the normal way.
	225	*
	226	* Force the alignment so the compiler doesn't space elements of the
	227	* obs_kernel_param "array" too far apart in .init.setup.
	228	*/
	229	#define __setup_param(str, unique_id, fn, early) \
d5aa0daf	230	static char __setup_str_##unique_id[] __initdata __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
	236	#define __setup_null_param(str, unique_id) \
	237	__setup_param(str, unique_id, NULL, 0)
	238
	239	#define __setup(str, fn) \
	240	__setup_param(str, fn, fn, 0)
	241
1da177e4 LT	242	/* NOTE: fn is as per module_param, not __setup! Emits warning if fn
	243	* returns non-zero. */
	244	#define early_param(str, fn) \
	245	__setup_param(str, fn, fn, 1)
	246
30d7e0d4	247	/* Relies on boot_command_line being set */
1da177e4 LT	248	void __init parse_early_param(void);
	249	#endif /* __ASSEMBLY__ */
	250
	251	/**
	252	* module_init() - driver initialization entry point
	253	* @x: function to be run at kernel boot time or module insertion
	254	*
72fd4a35	255	* module_init() will either be called during do_initcalls() (if
1da177e4 LT	256	* builtin) or at module insertion time (if a module). There can only
	257	* be one per module.
	258	*/
	259	#define module_init(x) __initcall(x);
	260
	261	/**
	262	* module_exit() - driver exit entry point
	263	* @x: function to be run when driver is removed
	264	*
	265	* module_exit() will wrap the driver clean-up code
	266	* with cleanup_module() when used with rmmod when
	267	* the driver is a module. If the driver is statically
	268	* compiled into the kernel, module_exit() has no effect.
	269	* There can only be one per module.
	270	*/
	271	#define module_exit(x) __exitcall(x);
	272
	273	#else /* MODULE */
	274
	275	/* Don't use these in modules, but some people do... */
	276	#define core_initcall(fn) module_init(fn)
	277	#define postcore_initcall(fn) module_init(fn)
	278	#define arch_initcall(fn) module_init(fn)
	279	#define subsys_initcall(fn) module_init(fn)
	280	#define fs_initcall(fn) module_init(fn)
	281	#define device_initcall(fn) module_init(fn)
	282	#define late_initcall(fn) module_init(fn)
	283
	284	#define security_initcall(fn) module_init(fn)
	285
4500d067	286	/* Each module must use one module_init(). */
1da177e4 LT	287	#define module_init(initfn) \
	288	static inline initcall_t __inittest(void) \
	289	{ return initfn; } \
	290	int init_module(void) __attribute__((alias(#initfn)));
	291
	292	/* This is only required if you want to be unloadable. */
	293	#define module_exit(exitfn) \
	294	static inline exitcall_t __exittest(void) \
	295	{ return exitfn; } \
	296	void cleanup_module(void) __attribute__((alias(#exitfn)));
	297
	298	#define __setup_param(str, unique_id, fn) /* nothing */
	299	#define __setup_null_param(str, unique_id) /* nothing */
	300	#define __setup(str, func) /* nothing */
1da177e4 LT	301	#endif
1da177e4 LT	302
ab3bfca7	303	/* Data marked not to be saved by software suspend */
f3fe866d	304	#define __nosavedata __section(.data.nosave)
1da177e4 LT	305
	306	/* This means "can be init if no module support, otherwise module load
	307	may call it." */
	308	#ifdef CONFIG_MODULES
	309	#define __init_or_module
	310	#define __initdata_or_module
	311	#else
	312	#define __init_or_module __init
	313	#define __initdata_or_module __initdata
	314	#endif /CONFIG_MODULES/
	315
1da177e4 LT	316	/* Functions marked as __devexit may be discarded at kernel link time, depending
	317	on config options. Newer versions of binutils detect references from
	318	retained sections to discarded sections and flag an error. Pointers to
	319	__devexit functions must use __devexit_p(function_name), the wrapper will
	320	insert either the function_name or NULL, depending on the config options.
	321	*/
	322	#if defined(MODULE) \|\| defined(CONFIG_HOTPLUG)
	323	#define __devexit_p(x) x
	324	#else
	325	#define __devexit_p(x) NULL
	326	#endif
	327
	328	#ifdef MODULE
	329	#define __exit_p(x) x
	330	#else
	331	#define __exit_p(x) NULL
	332	#endif
	333
	334	#endif /* _LINUX_INIT_H */