mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 00:48:50 +00:00
2329abfa34
module_param(bool) used to counter-intuitively take an int. In
fddd5201 (mid-2009) we allowed bool or int/unsigned int using a messy
trick.
It's time to remove the int/unsigned int option. For this version
it'll simply give a warning, but it'll break next kernel version.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
350 lines
12 KiB
C
350 lines
12 KiB
C
#ifndef _LINUX_INIT_H
|
|
#define _LINUX_INIT_H
|
|
|
|
#include <linux/compiler.h>
|
|
#include <linux/types.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 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.
|
|
*
|
|
* 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 notrace
|
|
#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)
|
|
|
|
/* 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 notrace
|
|
|
|
/* Used for HOTPLUG */
|
|
#define __devinit __section(.devinit.text) __cold notrace
|
|
#define __devinitdata __section(.devinit.data)
|
|
#define __devinitconst __section(.devinit.rodata)
|
|
#define __devexit __section(.devexit.text) __exitused __cold notrace
|
|
#define __devexitdata __section(.devexit.data)
|
|
#define __devexitconst __section(.devexit.rodata)
|
|
|
|
/* Used for HOTPLUG_CPU */
|
|
#define __cpuinit __section(.cpuinit.text) __cold notrace
|
|
#define __cpuinitdata __section(.cpuinit.data)
|
|
#define __cpuinitconst __section(.cpuinit.rodata)
|
|
#define __cpuexit __section(.cpuexit.text) __exitused __cold notrace
|
|
#define __cpuexitdata __section(.cpuexit.data)
|
|
#define __cpuexitconst __section(.cpuexit.rodata)
|
|
|
|
/* Used for MEMORY_HOTPLUG */
|
|
#define __meminit __section(.meminit.text) __cold notrace
|
|
#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 __DEVINIT .section ".devinit.text", "ax"
|
|
#define __DEVINITDATA .section ".devinit.data", "aw"
|
|
#define __DEVINITRODATA .section ".devinit.rodata", "a"
|
|
|
|
#define __CPUINIT .section ".cpuinit.text", "ax"
|
|
#define __CPUINITDATA .section ".cpuinit.data", "aw"
|
|
#define __CPUINITRODATA .section ".cpuinit.rodata", "a"
|
|
|
|
#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);
|
|
|
|
extern initcall_t __con_initcall_start[], __con_initcall_end[];
|
|
extern initcall_t __security_initcall_start[], __security_initcall_end[];
|
|
|
|
/* Used for contructor calls. */
|
|
typedef void (*ctor_fn_t)(void);
|
|
|
|
/* 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);
|
|
|
|
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.
|
|
*/
|
|
|
|
#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 const char __setup_str_##unique_id[] __initconst \
|
|
__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(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);
|
|
void __init parse_early_options(char *cmdline);
|
|
#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 early_initcall(fn) module_init(fn)
|
|
#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(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
|
|
#define __initconst_or_module
|
|
#define __INIT_OR_MODULE .text
|
|
#define __INITDATA_OR_MODULE .data
|
|
#define __INITRODATA_OR_MODULE .section ".rodata","a",%progbits
|
|
#else
|
|
#define __init_or_module __init
|
|
#define __initdata_or_module __initdata
|
|
#define __initconst_or_module __initconst
|
|
#define __INIT_OR_MODULE __INIT
|
|
#define __INITDATA_OR_MODULE __INITDATA
|
|
#define __INITRODATA_OR_MODULE __INITRODATA
|
|
#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 */
|