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module: Constify 'struct module_attribute'

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These structs are never modified, move them to read-only memory.
This makes the API clearer and also prepares for the constification of
'struct attribute' itself.

While at it, also constify 'modinfo_attrs_count'.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Petr Pavlu <petr.pavlu@suse.com>
Link: https://lore.kernel.org/r/20241216-sysfs-const-attr-module-v1-3-3790b53e0abf@weissschuh.net
Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>
This commit is contained in:
Thomas Weißschuh 2024-12-16 18:25:10 +01:00 committed by Petr Pavlu
parent cb80af8451
commit 25aa761160
5 changed files with 34 additions and 34 deletions
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8
include/linux/module.h
View File

@ -52,9 +52,9 @@ struct module_kobject {
struct module_attribute {
struct attribute attr;
ssize_t (*show)(struct module_attribute *, struct module_kobject *,
ssize_t (*show)(const struct module_attribute *, struct module_kobject *,
char *);
ssize_t (*store)(struct module_attribute *, struct module_kobject *,
ssize_t (*store)(const struct module_attribute *, struct module_kobject *,
const char *, size_t count);
void (*setup)(struct module *, const char *);
int (*test)(struct module *);
@ -67,10 +67,10 @@ struct module_version_attribute {
const char *version;
};
extern ssize_t __modver_version_show(struct module_attribute *,
extern ssize_t __modver_version_show(const struct module_attribute *,
struct module_kobject *, char *);
extern struct module_attribute module_uevent;
extern const struct module_attribute module_uevent;
/* These are either module local, or the kernel's dummy ones. */
extern int init_module(void);

4
kernel/module/internal.h
View File

@ -47,8 +47,8 @@ struct kernel_symbol {
extern struct mutex module_mutex;
extern struct list_head modules;
extern struct module_attribute *modinfo_attrs[];
extern size_t modinfo_attrs_count;
extern const struct module_attribute *const modinfo_attrs[];
extern const size_t modinfo_attrs_count;
/* Provided by the linker */
extern const struct kernel_symbol __start___ksymtab[];

40
kernel/module/main.c
View File

@ -538,7 +538,7 @@ static void setup_modinfo_##field(struct module *mod, const char *s) \
{ \
mod->field = kstrdup(s, GFP_KERNEL); \
} \
static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
static ssize_t show_modinfo_##field(const struct module_attribute *mattr, \
struct module_kobject *mk, char *buffer) \
{ \
return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \
@ -552,7 +552,7 @@ static void free_modinfo_##field(struct module *mod) \
kfree(mod->field); \
mod->field = NULL; \
} \
static struct module_attribute modinfo_##field = { \
static const struct module_attribute modinfo_##field = { \
.attr = { .name = __stringify(field), .mode = 0444 }, \
.show = show_modinfo_##field, \
.setup = setup_modinfo_##field, \
@ -842,13 +842,13 @@ void symbol_put_addr(void *addr)
}
EXPORT_SYMBOL_GPL(symbol_put_addr);
static ssize_t show_refcnt(struct module_attribute *mattr,
static ssize_t show_refcnt(const struct module_attribute *mattr,
struct module_kobject *mk, char *buffer)
{
return sprintf(buffer, "%i\n", module_refcount(mk->mod));
}
static struct module_attribute modinfo_refcnt =
static const struct module_attribute modinfo_refcnt =
__ATTR(refcnt, 0444, show_refcnt, NULL);
void __module_get(struct module *module)
@ -917,7 +917,7 @@ size_t module_flags_taint(unsigned long taints, char *buf)
return l;
}
static ssize_t show_initstate(struct module_attribute *mattr,
static ssize_t show_initstate(const struct module_attribute *mattr,
struct module_kobject *mk, char *buffer)
{
const char *state = "unknown";
@ -938,10 +938,10 @@ static ssize_t show_initstate(struct module_attribute *mattr,
return sprintf(buffer, "%s\n", state);
}
static struct module_attribute modinfo_initstate =
static const struct module_attribute modinfo_initstate =
__ATTR(initstate, 0444, show_initstate, NULL);
static ssize_t store_uevent(struct module_attribute *mattr,
static ssize_t store_uevent(const struct module_attribute *mattr,
struct module_kobject *mk,
const char *buffer, size_t count)
{
@ -951,10 +951,10 @@ static ssize_t store_uevent(struct module_attribute *mattr,
return rc ? rc : count;
}
struct module_attribute module_uevent =
const struct module_attribute module_uevent =
__ATTR(uevent, 0200, NULL, store_uevent);
static ssize_t show_coresize(struct module_attribute *mattr,
static ssize_t show_coresize(const struct module_attribute *mattr,
struct module_kobject *mk, char *buffer)
{
unsigned int size = mk->mod->mem[MOD_TEXT].size;
@ -966,11 +966,11 @@ static ssize_t show_coresize(struct module_attribute *mattr,
return sprintf(buffer, "%u\n", size);
}
static struct module_attribute modinfo_coresize =
static const struct module_attribute modinfo_coresize =
__ATTR(coresize, 0444, show_coresize, NULL);
#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
static ssize_t show_datasize(struct module_attribute *mattr,
static ssize_t show_datasize(const struct module_attribute *mattr,
struct module_kobject *mk, char *buffer)
{
unsigned int size = 0;
@ -980,11 +980,11 @@ static ssize_t show_datasize(struct module_attribute *mattr,
return sprintf(buffer, "%u\n", size);
}
static struct module_attribute modinfo_datasize =
static const struct module_attribute modinfo_datasize =
__ATTR(datasize, 0444, show_datasize, NULL);
#endif
static ssize_t show_initsize(struct module_attribute *mattr,
static ssize_t show_initsize(const struct module_attribute *mattr,
struct module_kobject *mk, char *buffer)
{
unsigned int size = 0;
@ -994,10 +994,10 @@ static ssize_t show_initsize(struct module_attribute *mattr,
return sprintf(buffer, "%u\n", size);
}
static struct module_attribute modinfo_initsize =
static const struct module_attribute modinfo_initsize =
__ATTR(initsize, 0444, show_initsize, NULL);
static ssize_t show_taint(struct module_attribute *mattr,
static ssize_t show_taint(const struct module_attribute *mattr,
struct module_kobject *mk, char *buffer)
{
size_t l;
@ -1007,10 +1007,10 @@ static ssize_t show_taint(struct module_attribute *mattr,
return l;
}
static struct module_attribute modinfo_taint =
static const struct module_attribute modinfo_taint =
__ATTR(taint, 0444, show_taint, NULL);
struct module_attribute *modinfo_attrs[] = {
const struct module_attribute *const modinfo_attrs[] = {
&module_uevent,
&modinfo_version,
&modinfo_srcversion,
@ -1027,7 +1027,7 @@ struct module_attribute *modinfo_attrs[] = {
NULL,
};
size_t modinfo_attrs_count = ARRAY_SIZE(modinfo_attrs);
const size_t modinfo_attrs_count = ARRAY_SIZE(modinfo_attrs);
static const char vermagic[] = VERMAGIC_STRING;
@ -1681,7 +1681,7 @@ static void module_license_taint_check(struct module *mod, const char *license)
static void setup_modinfo(struct module *mod, struct load_info *info)
{
struct module_attribute *attr;
const struct module_attribute *attr;
int i;
for (i = 0; (attr = modinfo_attrs[i]); i++) {
@ -1692,7 +1692,7 @@ static void setup_modinfo(struct module *mod, struct load_info *info)
static void free_modinfo(struct module *mod)
{
struct module_attribute *attr;
const struct module_attribute *attr;
int i;
for (i = 0; (attr = modinfo_attrs[i]); i++) {

4
kernel/module/sysfs.c
View File

@ -275,7 +275,7 @@ static int add_usage_links(struct module *mod)
static void module_remove_modinfo_attrs(struct module *mod, int end)
{
struct module_attribute *attr;
const struct module_attribute *attr;
int i;
for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
@ -293,7 +293,7 @@ static void module_remove_modinfo_attrs(struct module *mod, int end)
static int module_add_modinfo_attrs(struct module *mod)
{
struct module_attribute *attr;
const struct module_attribute *attr;
struct module_attribute *temp_attr;
int error = 0;
int i;

12
kernel/params.c
View File

@ -538,7 +538,7 @@ const struct kernel_param_ops param_ops_string = {
EXPORT_SYMBOL(param_ops_string);
/* sysfs output in /sys/modules/XYZ/parameters/ */
#define to_module_attr(n) container_of(n, struct module_attribute, attr)
#define to_module_attr(n) container_of_const(n, struct module_attribute, attr)
#define to_module_kobject(n) container_of(n, struct module_kobject, kobj)
struct param_attribute
@ -557,7 +557,7 @@ struct module_param_attrs
#ifdef CONFIG_SYSFS
#define to_param_attr(n) container_of_const(n, struct param_attribute, mattr)
static ssize_t param_attr_show(struct module_attribute *mattr,
static ssize_t param_attr_show(const struct module_attribute *mattr,
struct module_kobject *mk, char *buf)
{
int count;
@ -573,7 +573,7 @@ static ssize_t param_attr_show(struct module_attribute *mattr,
}
/* sysfs always hands a nul-terminated string in buf. We rely on that. */
static ssize_t param_attr_store(struct module_attribute *mattr,
static ssize_t param_attr_store(const struct module_attribute *mattr,
struct module_kobject *mk,
const char *buf, size_t len)
{
@ -857,7 +857,7 @@ static void __init param_sysfs_builtin(void)
}
}
ssize_t __modver_version_show(struct module_attribute *mattr,
ssize_t __modver_version_show(const struct module_attribute *mattr,
struct module_kobject *mk, char *buf)
{
const struct module_version_attribute *vattr =
@ -892,7 +892,7 @@ static ssize_t module_attr_show(struct kobject *kobj,
struct attribute *attr,
char *buf)
{
struct module_attribute *attribute;
const struct module_attribute *attribute;
struct module_kobject *mk;
int ret;
@ -911,7 +911,7 @@ static ssize_t module_attr_store(struct kobject *kobj,
struct attribute *attr,
const char *buf, size_t len)
{
struct module_attribute *attribute;
const struct module_attribute *attribute;
struct module_kobject *mk;
int ret;