kernel/livepatch/core.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LIVEPATCH_CORE_H
   3 #define _LIVEPATCH_CORE_H
   4
   5 #include <linux/livepatch.h>
   6
   7 extern struct mutex klp_mutex;
   8 extern struct list_head klp_patches;
   9
  10 #define klp_for_each_patch_safe(patch, tmp_patch)               \
  11         list_for_each_entry_safe(patch, tmp_patch, &klp_patches, list)
  12
  13 #define klp_for_each_patch(patch)       \
  14         list_for_each_entry(patch, &klp_patches, list)
  15
  16 void klp_free_patch_async(struct klp_patch *patch);
  17 void klp_free_replaced_patches_async(struct klp_patch *new_patch);
  18 void klp_unpatch_replaced_patches(struct klp_patch *new_patch);
  19 void klp_discard_nops(struct klp_patch *new_patch);
  20
  21 static inline bool klp_is_object_loaded(struct klp_object *obj)
  22 {
  23         return !obj->name || obj->mod;
  24 }
  25
  26 static inline int klp_pre_patch_callback(struct klp_object *obj)
  27 {
  28         int ret = 0;
  29
  30         if (obj->callbacks.pre_patch)
  31                 ret = (*obj->callbacks.pre_patch)(obj);
  32
  33         obj->callbacks.post_unpatch_enabled = !ret;
  34
  35         return ret;
  36 }
  37
  38 static inline void klp_post_patch_callback(struct klp_object *obj)
  39 {
  40         if (obj->callbacks.post_patch)
  41                 (*obj->callbacks.post_patch)(obj);
  42 }
  43
  44 static inline void klp_pre_unpatch_callback(struct klp_object *obj)
  45 {
  46         if (obj->callbacks.pre_unpatch)
  47                 (*obj->callbacks.pre_unpatch)(obj);
  48 }
  49
  50 static inline void klp_post_unpatch_callback(struct klp_object *obj)
  51 {
  52         if (obj->callbacks.post_unpatch_enabled &&
  53             obj->callbacks.post_unpatch)
  54                 (*obj->callbacks.post_unpatch)(obj);
  55
  56         obj->callbacks.post_unpatch_enabled = false;
  57 }
  58
  59 #endif /* _LIVEPATCH_CORE_H */