[linux-2.6-block.git] / include / linux / init.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_INIT_H
#define _LINUX_INIT_H

#include <linux/build_bug.h>
#include <linux/compiler.h>
#include <linux/stringify.h>
#include <linux/types.h>

/* Built-in __init functions needn't be compiled with retpoline */
#if defined(__noretpoline) && !defined(MODULE)
#define __noinitretpoline __noretpoline
#else
#define __noinitretpoline
#endif

/* 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 or __initconst 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.
 */

/* These are for everybody (although not all archs will actually
   discard it in modules) */
#define __init		__section(".init.text") __cold  __latent_entropy __noinitretpoline
#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.  Intended semantics is that a code or
 * data tagged __ref* can reference code or data from init section without
 * producing a warning (of course, no warning does not mean code is
 * correct, so optimally document why the __ref is needed and why it's OK).
 *
 * 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")

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

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

#ifdef CONFIG_MEMORY_HOTPLUG
#define __meminit
#define __meminitdata
#define __meminitconst
#else
#define __meminit	__init
#define __meminitdata	__initdata
#define __meminitconst	__initconst
#endif

/* 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

/* 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);

#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
typedef int initcall_entry_t;

static inline initcall_t initcall_from_entry(initcall_entry_t *entry)
{
	return offset_to_ptr(entry);
}
#else
typedef initcall_t initcall_entry_t;

static inline initcall_t initcall_from_entry(initcall_entry_t *entry)
{
	return *entry;
}
#endif

extern initcall_entry_t __con_initcall_start[], __con_initcall_end[];

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

struct file_system_type;

/* 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 saved_command_line_len;
extern unsigned int reset_devices;

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

void init_IRQ(void);
void time_init(void);
void poking_init(void);
void pgtable_cache_init(void);

extern initcall_entry_t __initcall_start[];
extern initcall_entry_t __initcall0_start[];
extern initcall_entry_t __initcall1_start[];
extern initcall_entry_t __initcall2_start[];
extern initcall_entry_t __initcall3_start[];
extern initcall_entry_t __initcall4_start[];
extern initcall_entry_t __initcall5_start[];
extern initcall_entry_t __initcall6_start[];
extern initcall_entry_t __initcall7_start[];
extern initcall_entry_t __initcall_end[];

extern struct file_system_type rootfs_fs_type;

extern bool rodata_enabled;
void mark_rodata_ro(void);

extern void (*late_time_init)(void);

extern bool initcall_debug;

#ifdef MODULE
extern struct module __this_module;
#define THIS_MODULE (&__this_module)
#else
#define THIS_MODULE ((struct module *)0)
#endif

#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.
 *
 * Initcalls are run by placing pointers in initcall sections that the
 * kernel iterates at runtime. The linker can do dead code / data elimination
 * and remove that completely, so the initcall sections have to be marked
 * as KEEP() in the linker script.
 */

/* Format: <modname>__<counter>_<line>_<fn> */
#define __initcall_id(fn)					\
	__PASTE(__KBUILD_MODNAME,				\
	__PASTE(__,						\
	__PASTE(__COUNTER__,					\
	__PASTE(_,						\
	__PASTE(__LINE__,					\
	__PASTE(_, fn))))))

/* Format: __<prefix>__<iid><id> */
#define __initcall_name(prefix, __iid, id)			\
	__PASTE(__,						\
	__PASTE(prefix,						\
	__PASTE(__,						\
	__PASTE(__iid, id))))

#ifdef CONFIG_LTO_CLANG
/*
 * With LTO, the compiler doesn't necessarily obey link order for
 * initcalls. In order to preserve the correct order, we add each
 * variable into its own section and generate a linker script (in
 * scripts/link-vmlinux.sh) to specify the order of the sections.
 */
#define __initcall_section(__sec, __iid)			\
	#__sec ".init.." #__iid

/*
 * With LTO, the compiler can rename static functions to avoid
 * global naming collisions. We use a global stub function for
 * initcalls to create a stable symbol name whose address can be
 * taken in inline assembly when PREL32 relocations are used.
 */
#define __initcall_stub(fn, __iid, id)				\
	__initcall_name(initstub, __iid, id)

#define __define_initcall_stub(__stub, fn)			\
	int __init __stub(void);				\
	int __init __stub(void)					\
	{ 							\
		return fn();					\
	}							\
	__ADDRESSABLE(__stub)
#else
#define __initcall_section(__sec, __iid)			\
	#__sec ".init"

#define __initcall_stub(fn, __iid, id)	fn

#define __define_initcall_stub(__stub, fn)			\
	__ADDRESSABLE(fn)
#endif

#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
#define ____define_initcall(fn, __stub, __name, __sec)		\
	__define_initcall_stub(__stub, fn)			\
	asm(".section	\"" __sec "\", \"a\"		\n"	\
	    __stringify(__name) ":			\n"	\
	    ".long	" __stringify(__stub) " - .	\n"	\
	    ".previous					\n");	\
	static_assert(__same_type(initcall_t, &fn));
#else
#define ____define_initcall(fn, __unused, __name, __sec)	\
	static initcall_t __name __used 			\
		__attribute__((__section__(__sec))) = fn;
#endif

#define __unique_initcall(fn, id, __sec, __iid)			\
	____define_initcall(fn,					\
		__initcall_stub(fn, __iid, id),			\
		__initcall_name(initcall, __iid, id),		\
		__initcall_section(__sec, __iid))

#define ___define_initcall(fn, id, __sec)			\
	__unique_initcall(fn, id, __sec, __initcall_id(fn))

#define __define_initcall(fn, id) ___define_initcall(fn, id, .initcall##id)

/*
 * Early initcalls run before initializing SMP.
 *
 * Only for built-in code, not modules.
 */
#define early_initcall(fn)		__define_initcall(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.
 * Keep main.c:initcall_level_names[] in sync.
 */
#define pure_initcall(fn)		__define_initcall(fn, 0)

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

#define __initcall(fn) device_initcall(fn)

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

#define console_initcall(fn)	___define_initcall(fn, con, .con_initcall)

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

extern const struct obs_kernel_param __setup_start[], __setup_end[];

/*
 * 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")				\
		__aligned(__alignof__(struct obs_kernel_param))		\
		= { __setup_str_##unique_id, fn, early }

/*
 * NOTE: __setup functions return values:
 * @fn returns 1 (or non-zero) if the option argument is "handled"
 * and returns 0 if the option argument is "not handled".
 */
#define __setup(str, fn)						\
	__setup_param(str, fn, fn, 0)

/*
 * NOTE: @fn is as per module_param, not __setup!
 * I.e., @fn returns 0 for no error or non-zero for error
 * (possibly @fn returns a -errno value, but it does not matter).
 * Emits warning if @fn returns non-zero.
 */
#define early_param(str, fn)						\
	__setup_param(str, fn, fn, 1)

#define early_param_on_off(str_on, str_off, var, config)		\
									\
	int var = IS_ENABLED(config);					\
									\
	static int __init parse_##var##_on(char *arg)			\
	{								\
		var = 1;						\
		return 0;						\
	}								\
	early_param(str_on, parse_##var##_on);				\
									\
	static int __init parse_##var##_off(char *arg)			\
	{								\
		var = 0;						\
		return 0;						\
	}								\
	early_param(str_off, parse_##var##_off)

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

#else /* MODULE */

#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")

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

#endif /* _LINUX_INIT_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	#ifndef _LINUX_INIT_H
	3	#define _LINUX_INIT_H
	4
de985c10	5	#include <linux/build_bug.h>
1da177e4	6	#include <linux/compiler.h>
de985c10	7	#include <linux/stringify.h>
2329abfa	8	#include <linux/types.h>
1da177e4	9
66f79309	10	/* Built-in __init functions needn't be compiled with retpoline */
87358710 DW	11	#if defined(__noretpoline) && !defined(MODULE)
87358710 DW	12	#define __noinitretpoline __noretpoline
66f79309	13	#else
87358710	14	#define __noinitretpoline
66f79309 DW	15	#endif
66f79309 DW	16
1da177e4 LT	17	/* These macros are used to mark some functions or
	18	* initialized data (doesn't apply to uninitialized data)
	19	* as `initialization' functions. The kernel can take this
	20	* as hint that the function is used only during the initialization
	21	* phase and free up used memory resources after
	22	*
	23	* Usage:
	24	* For functions:
	25	*
	26	* You should add __init immediately before the function name, like:
	27	*
	28	* static void __init initme(int x, int y)
	29	* {
	30	* extern int z; z = x * y;
	31	* }
	32	*
	33	* If the function has a prototype somewhere, you can also add
	34	* __init between closing brace of the prototype and semicolon:
	35	*
	36	* extern int initialize_foobar_device(int, int, int) __init;
	37	*
	38	* For initialized data:
65321547 GU	39	* You should insert __initdata or __initconst between the variable name
65321547 GU	40	* and equal sign followed by value, e.g.:
1da177e4 LT	41	*
1da177e4 LT	42	* static int init_variable __initdata = 0;
ae52bb23	43	* static const char linux_logo[] __initconst = { 0x32, 0x36, ... };
1da177e4 LT	44	*
	45	* Don't forget to initialize data not at file scope, i.e. within a function,
	46	* as gcc otherwise puts the data into the bss section and not into the init
	47	* section.
1da177e4 LT	48	*/
	49
	50	/* These are for everybody (although not all archs will actually
	51	discard it in modules) */
5dbbb3ea	52	#define __init __section(".init.text") __cold __latent_entropy __noinitretpoline
33def849 JP	53	#define __initdata __section(".init.data")
	54	#define __initconst __section(".init.rodata")
	55	#define __exitdata __section(".exit.data")
	56	#define __exit_call __used __section(".exitcall.exit")
1da177e4	57
5ea08178 MN	58	/*
5ea08178 MN	59	* modpost check for section mismatches during the kernel build.
0e0d314e SR	60	* A section mismatch happens when there are references from a
	61	* code or data section to an init section (both code or data).
	62	* The init sections are (for most archs) discarded by the kernel
	63	* when early init has completed so all such references are potential bugs.
	64	* For exit sections the same issue exists.
5ea08178	65	*
0e0d314e	66	* The following markers are used for the cases where the reference to
312b1485	67	* the init / exit section (code or data) is valid and will teach
5ea08178 MN	68	* modpost not to issue a warning. Intended semantics is that a code or
	69	* data tagged __ref* can reference code or data from init section without
	70	* producing a warning (of course, no warning does not mean code is
	71	* correct, so optimally document why the __ref is needed and why it's OK).
	72	*
	73	* The markers follow same syntax rules as __init / __initdata.
	74	*/
33def849 JP	75	#define __ref __section(".ref.text") noinline
	76	#define __refdata __section(".ref.data")
	77	#define __refconst __section(".ref.rodata")
312b1485	78
1da177e4	79	#ifdef MODULE
eb8f6890	80	#define __exitused
1da177e4	81	#else
eb8f6890	82	#define __exitused __used
1da177e4 LT	83	#endif
1da177e4 LT	84
33def849	85	#define __exit __section(".exit.text") __exitused __cold notrace
eb8f6890	86
73db3abd MY	87	#ifdef CONFIG_MEMORY_HOTPLUG
	88	#define __meminit
	89	#define __meminitdata
	90	#define __meminitconst
	91	#else
	92	#define __meminit __init
	93	#define __meminitdata __initdata
	94	#define __meminitconst __initconst
	95	#endif
eb8f6890	96
1da177e4	97	/* For assembly routines */
7923f90f	98	#define __HEAD .section ".head.text","ax"
1da177e4	99	#define __INIT .section ".init.text","ax"
86c0baf1	100	#define __FINIT .previous
eb8f6890	101
8b5a10fc JB	102	#define __INITDATA .section ".init.data","aw",%progbits
8b5a10fc JB	103	#define __INITRODATA .section ".init.rodata","a",%progbits
9f9975a5	104	#define __FINITDATA .previous
1da177e4	105
312b1485 SR	106	/* silence warnings when references are OK */
	107	#define __REF .section ".ref.text", "ax"
	108	#define __REFDATA .section ".ref.data", "aw"
3f5e26ce	109	#define __REFCONST .section ".ref.rodata", "a"
312b1485	110
1da177e4 LT	111	#ifndef __ASSEMBLY__
	112	/*
	113	* Used for initialization calls..
	114	*/
	115	typedef int (*initcall_t)(void);
	116	typedef void (*exitcall_t)(void);
	117
1b1eeca7 AB	118	#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
	119	typedef int initcall_entry_t;
	120
	121	static inline initcall_t initcall_from_entry(initcall_entry_t *entry)
	122	{
	123	return offset_to_ptr(entry);
	124	}
	125	#else
	126	typedef initcall_t initcall_entry_t;
	127
	128	static inline initcall_t initcall_from_entry(initcall_entry_t *entry)
	129	{
	130	return *entry;
	131	}
	132	#endif
	133
	134	extern initcall_entry_t __con_initcall_start[], __con_initcall_end[];
1da177e4	135
8f824b4a	136	/* Used for constructor calls. */
b99b87f7 PO	137	typedef void (*ctor_fn_t)(void);
b99b87f7 PO	138
fd3e007f AV	139	struct file_system_type;
fd3e007f AV	140
1da177e4	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;
941baf6f	145	extern unsigned int saved_command_line_len;
7e96287d	146	extern unsigned int reset_devices;
77d47582 AB	147
77d47582 AB	148	/* used by init/main.c */
46595390 AB	149	void setup_arch(char **);
46595390 AB	150	void prepare_namespace(void);
037f11b4	151	void __init init_rootfs(void);
ad1a4830 AB	152
	153	void init_IRQ(void);
	154	void time_init(void);
ad1a4830 AB	155	void poking_init(void);
	156	void pgtable_cache_init(void);
	157
	158	extern initcall_entry_t __initcall_start[];
	159	extern initcall_entry_t __initcall0_start[];
	160	extern initcall_entry_t __initcall1_start[];
	161	extern initcall_entry_t __initcall2_start[];
	162	extern initcall_entry_t __initcall3_start[];
	163	extern initcall_entry_t __initcall4_start[];
	164	extern initcall_entry_t __initcall5_start[];
	165	extern initcall_entry_t __initcall6_start[];
	166	extern initcall_entry_t __initcall7_start[];
	167	extern initcall_entry_t __initcall_end[];
	168
fd3e007f	169	extern struct file_system_type rootfs_fs_type;
77d47582	170
39290b38	171	extern bool rodata_enabled;
e267d97b	172	void mark_rodata_ro(void);
e267d97b	173
7d195a54 AB	174	extern void (*late_time_init)(void);
7d195a54 AB	175
2329abfa	176	extern bool initcall_debug;
f2511774	177
5b20755b MY	178	#ifdef MODULE
	179	extern struct module __this_module;
	180	#define THIS_MODULE (&__this_module)
	181	#else
	182	#define THIS_MODULE ((struct module *)0)
	183	#endif
	184
1da177e4 LT	185	#endif
	186
	187	#ifndef MODULE
	188
	189	#ifndef __ASSEMBLY__
	190
b67067f1 NP	191	/*
b67067f1 NP	192	* initcalls are now grouped by functionality into separate
1da177e4 LT	193	* subsections. Ordering inside the subsections is determined
	194	* by link order.
	195	* For backwards compatibility, initcall() puts the call in
	196	* the device init subsection.
735a7ffb AM	197	*
	198	* The `id' arg to __define_initcall() is needed so that multiple initcalls
	199	* can point at the same handler without causing duplicate-symbol build errors.
b67067f1 NP	200	*
	201	* Initcalls are run by placing pointers in initcall sections that the
	202	* kernel iterates at runtime. The linker can do dead code / data elimination
	203	* and remove that completely, so the initcall sections have to be marked
	204	* as KEEP() in the linker script.
1da177e4 LT	205	*/
1da177e4 LT	206
a8cccdd9 ST	207	/* Format: <modname>__<counter>_<line>_<fn> */
	208	#define __initcall_id(fn) \
	209	__PASTE(__KBUILD_MODNAME, \
	210	__PASTE(__, \
	211	__PASTE(__COUNTER__, \
	212	__PASTE(_, \
	213	__PASTE(__LINE__, \
	214	__PASTE(_, fn))))))
	215
	216	/* Format: __<prefix>__<iid><id> */
	217	#define __initcall_name(prefix, __iid, id) \
	218	__PASTE(__, \
	219	__PASTE(prefix, \
	220	__PASTE(__, \
	221	__PASTE(__iid, id))))
	222
	223	#ifdef CONFIG_LTO_CLANG
	224	/*
	225	* With LTO, the compiler doesn't necessarily obey link order for
	226	* initcalls. In order to preserve the correct order, we add each
	227	* variable into its own section and generate a linker script (in
	228	* scripts/link-vmlinux.sh) to specify the order of the sections.
	229	*/
	230	#define __initcall_section(__sec, __iid) \
	231	#__sec ".init.." #__iid
3578ad11 ST	232
	233	/*
	234	* With LTO, the compiler can rename static functions to avoid
	235	* global naming collisions. We use a global stub function for
	236	* initcalls to create a stable symbol name whose address can be
	237	* taken in inline assembly when PREL32 relocations are used.
	238	*/
	239	#define __initcall_stub(fn, __iid, id) \
	240	__initcall_name(initstub, __iid, id)
	241
	242	#define __define_initcall_stub(__stub, fn) \
5659b598 ST	243	int __init __stub(void); \
5659b598 ST	244	int __init __stub(void) \
3578ad11 ST	245	{ \
	246	return fn(); \
	247	} \
	248	__ADDRESSABLE(__stub)
a8cccdd9 ST	249	#else
	250	#define __initcall_section(__sec, __iid) \
	251	#__sec ".init"
3578ad11 ST	252
	253	#define __initcall_stub(fn, __iid, id) fn
	254
	255	#define __define_initcall_stub(__stub, fn) \
	256	__ADDRESSABLE(fn)
a8cccdd9 ST	257	#endif
a8cccdd9 ST	258
1b1eeca7	259	#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
3578ad11 ST	260	#define ____define_initcall(fn, __stub, __name, __sec) \
3578ad11 ST	261	__define_initcall_stub(__stub, fn) \
a8cccdd9 ST	262	asm(".section \"" __sec "\", \"a\" \n" \
a8cccdd9 ST	263	__stringify(__name) ": \n" \
3578ad11	264	".long " __stringify(__stub) " - . \n" \
1cb61759 ME	265	".previous \n"); \
1cb61759 ME	266	static_assert(__same_type(initcall_t, &fn));
1b1eeca7	267	#else
3578ad11	268	#define ____define_initcall(fn, __unused, __name, __sec) \
a8cccdd9 ST	269	static initcall_t __name __used \
a8cccdd9 ST	270	__attribute__((__section__(__sec))) = fn;
1b1eeca7 AB	271	#endif
1b1eeca7 AB	272
a8cccdd9 ST	273	#define __unique_initcall(fn, id, __sec, __iid) \
a8cccdd9 ST	274	____define_initcall(fn, \
3578ad11	275	__initcall_stub(fn, __iid, id), \
a8cccdd9 ST	276	__initcall_name(initcall, __iid, id), \
	277	__initcall_section(__sec, __iid))
	278
	279	#define ___define_initcall(fn, id, __sec) \
	280	__unique_initcall(fn, id, __sec, __initcall_id(fn))
	281
1b1eeca7	282	#define __define_initcall(fn, id) ___define_initcall(fn, id, .initcall##id)
1da177e4	283
c2147a50 EGM	284	/*
	285	* Early initcalls run before initializing SMP.
	286	*
	287	* Only for built-in code, not modules.
	288	*/
7929d407	289	#define early_initcall(fn) __define_initcall(fn, early)
c2147a50	290
b3438f82 LT	291	/*
	292	* A "pure" initcall has no dependencies on anything else, and purely
	293	* initializes variables that couldn't be statically initialized.
	294	*
	295	* This only exists for built-in code, not for modules.
96263d28	296	* Keep main.c:initcall_level_names[] in sync.
b3438f82	297	*/
7929d407 ML	298	#define pure_initcall(fn) __define_initcall(fn, 0)
	299
	300	#define core_initcall(fn) __define_initcall(fn, 1)
	301	#define core_initcall_sync(fn) __define_initcall(fn, 1s)
	302	#define postcore_initcall(fn) __define_initcall(fn, 2)
	303	#define postcore_initcall_sync(fn) __define_initcall(fn, 2s)
	304	#define arch_initcall(fn) __define_initcall(fn, 3)
	305	#define arch_initcall_sync(fn) __define_initcall(fn, 3s)
	306	#define subsys_initcall(fn) __define_initcall(fn, 4)
	307	#define subsys_initcall_sync(fn) __define_initcall(fn, 4s)
	308	#define fs_initcall(fn) __define_initcall(fn, 5)
	309	#define fs_initcall_sync(fn) __define_initcall(fn, 5s)
	310	#define rootfs_initcall(fn) __define_initcall(fn, rootfs)
	311	#define device_initcall(fn) __define_initcall(fn, 6)
	312	#define device_initcall_sync(fn) __define_initcall(fn, 6s)
	313	#define late_initcall(fn) __define_initcall(fn, 7)
	314	#define late_initcall_sync(fn) __define_initcall(fn, 7s)
1da177e4 LT	315
	316	#define __initcall(fn) device_initcall(fn)
	317
b67067f1	318	#define __exitcall(fn) \
1da177e4 LT	319	static exitcall_t __exitcall_##fn __exit_call = fn
1da177e4 LT	320
a8cccdd9	321	#define console_initcall(fn) ___define_initcall(fn, con, .con_initcall)
1da177e4 LT	322
	323	struct obs_kernel_param {
	324	const char *str;
	325	int (setup_func)(char );
	326	int early;
	327	};
	328
ad1a4830 AB	329	extern const struct obs_kernel_param __setup_start[], __setup_end[];
ad1a4830 AB	330
1da177e4 LT	331	/*
	332	* Only for really core code. See moduleparam.h for the normal way.
	333	*
	334	* Force the alignment so the compiler doesn't space elements of the
	335	* obs_kernel_param "array" too far apart in .init.setup.
	336	*/
	337	#define __setup_param(str, unique_id, fn, early) \
c281b945 IM	338	static const char __setup_str_##unique_id[] __initconst \
	339	__aligned(1) = str; \
	340	static struct obs_kernel_param __setup_##unique_id \
33def849	341	__used __section(".init.setup") \
147ad605	342	__aligned(__alignof__(struct obs_kernel_param)) \
1da177e4 LT	343	= { __setup_str_##unique_id, fn, early }
1da177e4 LT	344
abc7da58 RD	345	/*
	346	* NOTE: __setup functions return values:
	347	* @fn returns 1 (or non-zero) if the option argument is "handled"
	348	* and returns 0 if the option argument is "not handled".
	349	*/
c281b945	350	#define __setup(str, fn) \
1da177e4 LT	351	__setup_param(str, fn, fn, 0)
1da177e4 LT	352
c281b945	353	/*
abc7da58 RD	354	* NOTE: @fn is as per module_param, not __setup!
	355	* I.e., @fn returns 0 for no error or non-zero for error
	356	* (possibly @fn returns a -errno value, but it does not matter).
	357	* Emits warning if @fn returns non-zero.
c281b945 IM	358	*/
c281b945 IM	359	#define early_param(str, fn) \
1da177e4 LT	360	__setup_param(str, fn, fn, 1)
1da177e4 LT	361
c281b945 IM	362	#define early_param_on_off(str_on, str_off, var, config) \
	363	\
	364	int var = IS_ENABLED(config); \
	365	\
	366	static int __init parse_##var##_on(char *arg) \
	367	{ \
	368	var = 1; \
	369	return 0; \
	370	} \
a5a673f7	371	early_param(str_on, parse_##var##_on); \
c281b945 IM	372	\
	373	static int __init parse_##var##_off(char *arg) \
	374	{ \
	375	var = 0; \
	376	return 0; \
	377	} \
a5a673f7	378	early_param(str_off, parse_##var##_off)
bfb33bad	379
30d7e0d4	380	/* Relies on boot_command_line being set */
1da177e4	381	void __init parse_early_param(void);
13977091	382	void __init parse_early_options(char *cmdline);
1da177e4 LT	383	#endif /* __ASSEMBLY__ */
1da177e4 LT	384
1da177e4 LT	385	#else /* MODULE */
1da177e4 LT	386
1da177e4	387	#define __setup_param(str, unique_id, fn) /* nothing */
1da177e4	388	#define __setup(str, func) /* nothing */
1da177e4 LT	389	#endif
1da177e4 LT	390
ab3bfca7	391	/* Data marked not to be saved by software suspend */
33def849	392	#define __nosavedata __section(".data..nosave")
1da177e4	393
1da177e4 LT	394	#ifdef MODULE
	395	#define __exit_p(x) x
	396	#else
	397	#define __exit_p(x) NULL
	398	#endif
	399
	400	#endif /* _LINUX_INIT_H */