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_start(struct klp_patch *patch);
  17 void klp_discard_replaced_patches(struct klp_patch *new_patch);
  18 void klp_discard_nops(struct klp_patch *new_patch);
  19
  20 static inline bool klp_is_object_loaded(struct klp_object *obj)
  21 {
  22         return !obj->name || obj->mod;
  23 }
  24
  25 static inline int klp_pre_patch_callback(struct klp_object *obj)
  26 {
  27         int ret = 0;
  28
  29         if (obj->callbacks.pre_patch)
  30                 ret = (*obj->callbacks.pre_patch)(obj);
  31
  32         obj->callbacks.post_unpatch_enabled = !ret;
  33
  34         return ret;
  35 }
  36
  37 static inline void klp_post_patch_callback(struct klp_object *obj)
  38 {
  39         if (obj->callbacks.post_patch)
  40                 (*obj->callbacks.post_patch)(obj);
  41 }
  42
  43 static inline void klp_pre_unpatch_callback(struct klp_object *obj)
  44 {
  45         if (obj->callbacks.pre_unpatch)
  46                 (*obj->callbacks.pre_unpatch)(obj);
  47 }
  48
  49 static inline void klp_post_unpatch_callback(struct klp_object *obj)
  50 {
  51         if (obj->callbacks.post_unpatch_enabled &&
  52             obj->callbacks.post_unpatch)
  53                 (*obj->callbacks.post_unpatch)(obj);
  54
  55         obj->callbacks.post_unpatch_enabled = false;
  56 }
  57
  58 #endif /* _LIVEPATCH_CORE_H */