[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

/* Used for MEMORY_HOTPLUG */
#define __meminit        __section(".meminit.text") __cold notrace \
						  __latent_entropy
#define __meminitdata    __section(".meminit.data")
#define __meminitconst   __section(".meminit.rodata")
#define __memexit        __section(".memexit.text") __exitused __cold notrace
#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 __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);

#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);
extern struct file_system_type rootfs_fs_type;

#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX)
extern bool rodata_enabled;
#endif
#ifdef CONFIG_STRICT_KERNEL_RWX
void mark_rodata_ro(void);
#endif

extern void (*late_time_init)(void);

extern bool initcall_debug;

#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;
};

/*
 * 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
eb8f6890	87	/* Used for MEMORY_HOTPLUG */
33def849	88	#define __meminit __section(".meminit.text") __cold notrace \
0766f788	89	__latent_entropy
33def849 JP	90	#define __meminitdata __section(".meminit.data")
	91	#define __meminitconst __section(".meminit.rodata")
	92	#define __memexit __section(".memexit.text") __exitused __cold notrace
	93	#define __memexitdata __section(".memexit.data")
	94	#define __memexitconst __section(".memexit.rodata")
eb8f6890	95
1da177e4	96	/* For assembly routines */
7923f90f	97	#define __HEAD .section ".head.text","ax"
1da177e4	98	#define __INIT .section ".init.text","ax"
86c0baf1	99	#define __FINIT .previous
eb8f6890	100
8b5a10fc JB	101	#define __INITDATA .section ".init.data","aw",%progbits
8b5a10fc JB	102	#define __INITRODATA .section ".init.rodata","a",%progbits
9f9975a5	103	#define __FINITDATA .previous
1da177e4	104
eb8f6890 SR	105	#define __MEMINIT .section ".meminit.text", "ax"
eb8f6890 SR	106	#define __MEMINITDATA .section ".meminit.data", "aw"
3f5e26ce	107	#define __MEMINITRODATA .section ".meminit.rodata", "a"
eb8f6890	108
312b1485 SR	109	/* silence warnings when references are OK */
	110	#define __REF .section ".ref.text", "ax"
	111	#define __REFDATA .section ".ref.data", "aw"
3f5e26ce	112	#define __REFCONST .section ".ref.rodata", "a"
312b1485	113
1da177e4 LT	114	#ifndef __ASSEMBLY__
	115	/*
	116	* Used for initialization calls..
	117	*/
	118	typedef int (*initcall_t)(void);
	119	typedef void (*exitcall_t)(void);
	120
1b1eeca7 AB	121	#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
	122	typedef int initcall_entry_t;
	123
	124	static inline initcall_t initcall_from_entry(initcall_entry_t *entry)
	125	{
	126	return offset_to_ptr(entry);
	127	}
	128	#else
	129	typedef initcall_t initcall_entry_t;
	130
	131	static inline initcall_t initcall_from_entry(initcall_entry_t *entry)
	132	{
	133	return *entry;
	134	}
	135	#endif
	136
	137	extern initcall_entry_t __con_initcall_start[], __con_initcall_end[];
1da177e4	138
8f824b4a	139	/* Used for constructor calls. */
b99b87f7 PO	140	typedef void (*ctor_fn_t)(void);
b99b87f7 PO	141
fd3e007f AV	142	struct file_system_type;
fd3e007f AV	143
1da177e4	144	/* Defined in init/main.c */
59f9415f	145	extern int do_one_initcall(initcall_t fn);
30d7e0d4 ABL	146	extern char __initdata boot_command_line[];
30d7e0d4 ABL	147	extern char *saved_command_line;
941baf6f	148	extern unsigned int saved_command_line_len;
7e96287d	149	extern unsigned int reset_devices;
77d47582 AB	150
77d47582 AB	151	/* used by init/main.c */
46595390 AB	152	void setup_arch(char **);
46595390 AB	153	void prepare_namespace(void);
037f11b4	154	void __init init_rootfs(void);
fd3e007f	155	extern struct file_system_type rootfs_fs_type;
77d47582	156
0f5bf6d0	157	#if defined(CONFIG_STRICT_KERNEL_RWX) \|\| defined(CONFIG_STRICT_MODULE_RWX)
39290b38 AT	158	extern bool rodata_enabled;
39290b38 AT	159	#endif
0f5bf6d0	160	#ifdef CONFIG_STRICT_KERNEL_RWX
e267d97b KC	161	void mark_rodata_ro(void);
	162	#endif
	163
7d195a54 AB	164	extern void (*late_time_init)(void);
7d195a54 AB	165
2329abfa	166	extern bool initcall_debug;
f2511774	167
1da177e4 LT	168	#endif
	169
	170	#ifndef MODULE
	171
	172	#ifndef __ASSEMBLY__
	173
b67067f1 NP	174	/*
b67067f1 NP	175	* initcalls are now grouped by functionality into separate
1da177e4 LT	176	* subsections. Ordering inside the subsections is determined
	177	* by link order.
	178	* For backwards compatibility, initcall() puts the call in
	179	* the device init subsection.
735a7ffb AM	180	*
	181	* The `id' arg to __define_initcall() is needed so that multiple initcalls
	182	* can point at the same handler without causing duplicate-symbol build errors.
b67067f1 NP	183	*
	184	* Initcalls are run by placing pointers in initcall sections that the
	185	* kernel iterates at runtime. The linker can do dead code / data elimination
	186	* and remove that completely, so the initcall sections have to be marked
	187	* as KEEP() in the linker script.
1da177e4 LT	188	*/
1da177e4 LT	189
a8cccdd9 ST	190	/* Format: <modname>__<counter>_<line>_<fn> */
	191	#define __initcall_id(fn) \
	192	__PASTE(__KBUILD_MODNAME, \
	193	__PASTE(__, \
	194	__PASTE(__COUNTER__, \
	195	__PASTE(_, \
	196	__PASTE(__LINE__, \
	197	__PASTE(_, fn))))))
	198
	199	/* Format: __<prefix>__<iid><id> */
	200	#define __initcall_name(prefix, __iid, id) \
	201	__PASTE(__, \
	202	__PASTE(prefix, \
	203	__PASTE(__, \
	204	__PASTE(__iid, id))))
	205
	206	#ifdef CONFIG_LTO_CLANG
	207	/*
	208	* With LTO, the compiler doesn't necessarily obey link order for
	209	* initcalls. In order to preserve the correct order, we add each
	210	* variable into its own section and generate a linker script (in
	211	* scripts/link-vmlinux.sh) to specify the order of the sections.
	212	*/
	213	#define __initcall_section(__sec, __iid) \
	214	#__sec ".init.." #__iid
3578ad11 ST	215
	216	/*
	217	* With LTO, the compiler can rename static functions to avoid
	218	* global naming collisions. We use a global stub function for
	219	* initcalls to create a stable symbol name whose address can be
	220	* taken in inline assembly when PREL32 relocations are used.
	221	*/
	222	#define __initcall_stub(fn, __iid, id) \
	223	__initcall_name(initstub, __iid, id)
	224
	225	#define __define_initcall_stub(__stub, fn) \
5659b598 ST	226	int __init __stub(void); \
5659b598 ST	227	int __init __stub(void) \
3578ad11 ST	228	{ \
	229	return fn(); \
	230	} \
	231	__ADDRESSABLE(__stub)
a8cccdd9 ST	232	#else
	233	#define __initcall_section(__sec, __iid) \
	234	#__sec ".init"
3578ad11 ST	235
	236	#define __initcall_stub(fn, __iid, id) fn
	237
	238	#define __define_initcall_stub(__stub, fn) \
	239	__ADDRESSABLE(fn)
a8cccdd9 ST	240	#endif
a8cccdd9 ST	241
1b1eeca7	242	#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
3578ad11 ST	243	#define ____define_initcall(fn, __stub, __name, __sec) \
3578ad11 ST	244	__define_initcall_stub(__stub, fn) \
a8cccdd9 ST	245	asm(".section \"" __sec "\", \"a\" \n" \
a8cccdd9 ST	246	__stringify(__name) ": \n" \
3578ad11	247	".long " __stringify(__stub) " - . \n" \
1cb61759 ME	248	".previous \n"); \
1cb61759 ME	249	static_assert(__same_type(initcall_t, &fn));
1b1eeca7	250	#else
3578ad11	251	#define ____define_initcall(fn, __unused, __name, __sec) \
a8cccdd9 ST	252	static initcall_t __name __used \
a8cccdd9 ST	253	__attribute__((__section__(__sec))) = fn;
1b1eeca7 AB	254	#endif
1b1eeca7 AB	255
a8cccdd9 ST	256	#define __unique_initcall(fn, id, __sec, __iid) \
a8cccdd9 ST	257	____define_initcall(fn, \
3578ad11	258	__initcall_stub(fn, __iid, id), \
a8cccdd9 ST	259	__initcall_name(initcall, __iid, id), \
	260	__initcall_section(__sec, __iid))
	261
	262	#define ___define_initcall(fn, id, __sec) \
	263	__unique_initcall(fn, id, __sec, __initcall_id(fn))
	264
1b1eeca7	265	#define __define_initcall(fn, id) ___define_initcall(fn, id, .initcall##id)
1da177e4	266
c2147a50 EGM	267	/*
	268	* Early initcalls run before initializing SMP.
	269	*
	270	* Only for built-in code, not modules.
	271	*/
7929d407	272	#define early_initcall(fn) __define_initcall(fn, early)
c2147a50	273
b3438f82 LT	274	/*
	275	* A "pure" initcall has no dependencies on anything else, and purely
	276	* initializes variables that couldn't be statically initialized.
	277	*
	278	* This only exists for built-in code, not for modules.
96263d28	279	* Keep main.c:initcall_level_names[] in sync.
b3438f82	280	*/
7929d407 ML	281	#define pure_initcall(fn) __define_initcall(fn, 0)
	282
	283	#define core_initcall(fn) __define_initcall(fn, 1)
	284	#define core_initcall_sync(fn) __define_initcall(fn, 1s)
	285	#define postcore_initcall(fn) __define_initcall(fn, 2)
	286	#define postcore_initcall_sync(fn) __define_initcall(fn, 2s)
	287	#define arch_initcall(fn) __define_initcall(fn, 3)
	288	#define arch_initcall_sync(fn) __define_initcall(fn, 3s)
	289	#define subsys_initcall(fn) __define_initcall(fn, 4)
	290	#define subsys_initcall_sync(fn) __define_initcall(fn, 4s)
	291	#define fs_initcall(fn) __define_initcall(fn, 5)
	292	#define fs_initcall_sync(fn) __define_initcall(fn, 5s)
	293	#define rootfs_initcall(fn) __define_initcall(fn, rootfs)
	294	#define device_initcall(fn) __define_initcall(fn, 6)
	295	#define device_initcall_sync(fn) __define_initcall(fn, 6s)
	296	#define late_initcall(fn) __define_initcall(fn, 7)
	297	#define late_initcall_sync(fn) __define_initcall(fn, 7s)
1da177e4 LT	298
	299	#define __initcall(fn) device_initcall(fn)
	300
b67067f1	301	#define __exitcall(fn) \
1da177e4 LT	302	static exitcall_t __exitcall_##fn __exit_call = fn
1da177e4 LT	303
a8cccdd9	304	#define console_initcall(fn) ___define_initcall(fn, con, .con_initcall)
1da177e4 LT	305
	306	struct obs_kernel_param {
	307	const char *str;
	308	int (setup_func)(char );
	309	int early;
	310	};
	311
	312	/*
	313	* Only for really core code. See moduleparam.h for the normal way.
	314	*
	315	* Force the alignment so the compiler doesn't space elements of the
	316	* obs_kernel_param "array" too far apart in .init.setup.
	317	*/
	318	#define __setup_param(str, unique_id, fn, early) \
c281b945 IM	319	static const char __setup_str_##unique_id[] __initconst \
	320	__aligned(1) = str; \
	321	static struct obs_kernel_param __setup_##unique_id \
33def849	322	__used __section(".init.setup") \
147ad605	323	__aligned(__alignof__(struct obs_kernel_param)) \
1da177e4 LT	324	= { __setup_str_##unique_id, fn, early }
1da177e4 LT	325
abc7da58 RD	326	/*
	327	* NOTE: __setup functions return values:
	328	* @fn returns 1 (or non-zero) if the option argument is "handled"
	329	* and returns 0 if the option argument is "not handled".
	330	*/
c281b945	331	#define __setup(str, fn) \
1da177e4 LT	332	__setup_param(str, fn, fn, 0)
1da177e4 LT	333
c281b945	334	/*
abc7da58 RD	335	* NOTE: @fn is as per module_param, not __setup!
	336	* I.e., @fn returns 0 for no error or non-zero for error
	337	* (possibly @fn returns a -errno value, but it does not matter).
	338	* Emits warning if @fn returns non-zero.
c281b945 IM	339	*/
c281b945 IM	340	#define early_param(str, fn) \
1da177e4 LT	341	__setup_param(str, fn, fn, 1)
1da177e4 LT	342
c281b945 IM	343	#define early_param_on_off(str_on, str_off, var, config) \
	344	\
	345	int var = IS_ENABLED(config); \
	346	\
	347	static int __init parse_##var##_on(char *arg) \
	348	{ \
	349	var = 1; \
	350	return 0; \
	351	} \
a5a673f7	352	early_param(str_on, parse_##var##_on); \
c281b945 IM	353	\
	354	static int __init parse_##var##_off(char *arg) \
	355	{ \
	356	var = 0; \
	357	return 0; \
	358	} \
a5a673f7	359	early_param(str_off, parse_##var##_off)
bfb33bad	360
30d7e0d4	361	/* Relies on boot_command_line being set */
1da177e4	362	void __init parse_early_param(void);
13977091	363	void __init parse_early_options(char *cmdline);
1da177e4 LT	364	#endif /* __ASSEMBLY__ */
1da177e4 LT	365
1da177e4 LT	366	#else /* MODULE */
1da177e4 LT	367
1da177e4	368	#define __setup_param(str, unique_id, fn) /* nothing */
1da177e4	369	#define __setup(str, func) /* nothing */
1da177e4 LT	370	#endif
1da177e4 LT	371
ab3bfca7	372	/* Data marked not to be saved by software suspend */
33def849	373	#define __nosavedata __section(".data..nosave")
1da177e4	374
1da177e4 LT	375	#ifdef MODULE
	376	#define __exit_p(x) x
	377	#else
	378	#define __exit_p(x) NULL
	379	#endif
	380
	381	#endif /* _LINUX_INIT_H */