include/linux/init.h

Source file repositories/reference/linux-study-clean/include/linux/init.h

File Facts

System
Linux kernel
Corpus path
include/linux/init.h
Extension
.h
Size
12128 bytes
Lines
396
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

#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

Annotation

Implementation Notes