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| author | Thomas Weißschuh <linux@weissschuh.net> | 2026-07-07 18:56:34 +0200 |
|---|---|---|
| committer | Danilo Krummrich <dakr@kernel.org> | 2026-07-11 20:38:01 +0200 |
| commit | ed96337a5baeae5eec8ed16f8c614dc316640680 (patch) | |
| tree | ea5b232f97d0e78137a805afad113ad05dbac6e4 /include/linux | |
| parent | a3a9c7453fd512e1700d63563fcd316b7795148d (diff) | |
| download | linux-next-ed96337a5baeae5eec8ed16f8c614dc316640680.tar.gz linux-next-ed96337a5baeae5eec8ed16f8c614dc316640680.zip | |
kobject: Allow the constification of kobject attributes
Allow kobject attribute to reside in read-only memory.
Both const and non-const attributes are handled by the utility macros
and attributes can be migrated one-by-one.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://patch.msgid.link/20260707-sysfs-const-attr-kobj-attr-prep-v2-3-35ae1bc0f9ef@weissschuh.net
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/kobject.h | 57 |
1 files changed, 51 insertions, 6 deletions
diff --git a/include/linux/kobject.h b/include/linux/kobject.h index 13bd0e87af7b..55e37a5d405e 100644 --- a/include/linux/kobject.h +++ b/include/linux/kobject.h @@ -138,17 +138,62 @@ struct kset_uevent_ops { struct kobj_attribute { struct attribute attr; - ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr, - char *buf); - ssize_t (*store)(struct kobject *kobj, struct kobj_attribute *attr, - const char *buf, size_t count); + __SYSFS_FUNCTION_ALTERNATIVE( + ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr, char *buf); + ssize_t (*show_const)(struct kobject *kobj, const struct kobj_attribute *attr, + char *buf); + ); + __SYSFS_FUNCTION_ALTERNATIVE( + ssize_t (*store)(struct kobject *kobj, struct kobj_attribute *attr, + const char *buf, size_t count); + ssize_t (*store_const)(struct kobject *kobj, const struct kobj_attribute *attr, + const char *buf, size_t count); + ); }; +typedef ssize_t __kobj_show_handler_const(struct kobject *kobj, const struct kobj_attribute *attr, + char *buf); +typedef ssize_t __kobj_store_handler_const(struct kobject *kobj, const struct kobj_attribute *attr, + const char *buf, size_t count); + +#ifdef CONFIG_CFI + +#define __KOBJ_ATTR_SHOW_STORE(_show, _store) \ + .show = _Generic(_show, \ + __kobj_show_handler_const * : NULL, \ + default : _show \ + ), \ + .show_const = _Generic(_show, \ + __kobj_show_handler_const * : _show, \ + default : NULL \ + ), \ + .store = _Generic(_store, \ + __kobj_store_handler_const * : NULL, \ + default : _store \ + ), \ + .store_const = _Generic(_store, \ + __kobj_store_handler_const * : _store, \ + default : NULL \ + ), + +#else + +#define __KOBJ_ATTR_SHOW_STORE(_show, _store) \ + .show = _Generic(_show, \ + __kobj_show_handler_const * : (void *)_show, \ + default : _show \ + ), \ + .store = _Generic(_store, \ + __kobj_store_handler_const * : (void *)_store, \ + default : _store \ + ), \ + +#endif + #define __KOBJ_ATTR(_name, _mode, _show, _store) { \ .attr = { .name = __stringify(_name), \ .mode = VERIFY_OCTAL_PERMISSIONS(_mode) }, \ - .show = _show, \ - .store = _store, \ + __KOBJ_ATTR_SHOW_STORE(_show, _store) \ } #define __KOBJ_ATTR_RO_MODE(_name, _mode) \ |