kernel/livepatch/core.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _LIVEPATCH_CORE_H
0003 #define _LIVEPATCH_CORE_H
0004
0005 #include <linux/livepatch.h>
0006
0007 extern struct mutex klp_mutex;
0008 extern struct list_head klp_patches;
0009
0010 #define klp_for_each_patch_safe(patch, tmp_patch)       \
0011     list_for_each_entry_safe(patch, tmp_patch, &klp_patches, list)
0012
0013 #define klp_for_each_patch(patch)   \
0014     list_for_each_entry(patch, &klp_patches, list)
0015
0016 void klp_free_patch_async(struct klp_patch *patch);
0017 void klp_free_replaced_patches_async(struct klp_patch *new_patch);
0018 void klp_unpatch_replaced_patches(struct klp_patch *new_patch);
0019 void klp_discard_nops(struct klp_patch *new_patch);
0020
0021 static inline bool klp_is_object_loaded(struct klp_object *obj)
0022 {
0023     return !obj->name || obj->mod;
0024 }
0025
0026 static inline int klp_pre_patch_callback(struct klp_object *obj)
0027 {
0028     int ret = 0;
0029
0030     if (obj->callbacks.pre_patch)
0031         ret = (*obj->callbacks.pre_patch)(obj);
0032
0033     obj->callbacks.post_unpatch_enabled = !ret;
0034
0035     return ret;
0036 }
0037
0038 static inline void klp_post_patch_callback(struct klp_object *obj)
0039 {
0040     if (obj->callbacks.post_patch)
0041         (*obj->callbacks.post_patch)(obj);
0042 }
0043
0044 static inline void klp_pre_unpatch_callback(struct klp_object *obj)
0045 {
0046     if (obj->callbacks.pre_unpatch)
0047         (*obj->callbacks.pre_unpatch)(obj);
0048 }
0049
0050 static inline void klp_post_unpatch_callback(struct klp_object *obj)
0051 {
0052     if (obj->callbacks.post_unpatch_enabled &&
0053         obj->callbacks.post_unpatch)
0054         (*obj->callbacks.post_unpatch)(obj);
0055
0056     obj->callbacks.post_unpatch_enabled = false;
0057 }
0058
0059 #endif /* _LIVEPATCH_CORE_H */