/* 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 … #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 … #define __initdata … #define __initconst … #define __exitdata … #define __exit_call … /* * 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 … #define __refdata … #define __refconst … #ifdef MODULE #define __exitused #else #define __exitused … #endif #define __exit … #ifdef CONFIG_MEMORY_HOTPLUG #define __meminit #define __meminitdata #define __meminitconst #else #define __meminit … #define __meminitdata … #define __meminitconst … #endif /* For assembly routines */ #define __HEAD … #define __INIT … #define __FINIT … #define __INITDATA … #define __INITRODATA … #define __FINITDATA … /* silence warnings when references are OK */ #define __REF … #define __REFDATA … #define __REFCONST … #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 … #else #define THIS_MODULE … #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 … /* Format: __<prefix>__<iid><id> */ #define __initcall_name … #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 … /* * 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 … #define __define_initcall_stub … #else #define __initcall_section … #define __initcall_stub … #define __define_initcall_stub … #endif #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS #define ____define_initcall … #else #define ____define_initcall … #endif #define __unique_initcall … #define ___define_initcall … #define __define_initcall … /* * Early initcalls run before initializing SMP. * * Only for built-in code, not modules. */ #define early_initcall … /* * 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 … #define core_initcall … #define core_initcall_sync … #define postcore_initcall … #define postcore_initcall_sync … #define arch_initcall … #define arch_initcall_sync … #define subsys_initcall … #define subsys_initcall_sync … #define fs_initcall … #define fs_initcall_sync … #define rootfs_initcall … #define device_initcall … #define device_initcall_sync … #define late_initcall … #define late_initcall_sync … #define __initcall … #define __exitcall … #define console_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 … /* * 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 … /* * 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 … #define early_param_on_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 … #define __setup … #endif /* Data marked not to be saved by software suspend */ #define __nosavedata … #ifdef MODULE #define __exit_p … #else #define __exit_p(x) … #endif #endif /* _LINUX_INIT_H */
Codebase Browser
linux