kernel/livepatch/patch.h

   1 #ifndef _LIVEPATCH_PATCH_H
   2 #define _LIVEPATCH_PATCH_H
   3
   4 #include <linux/livepatch.h>
   5 #include <linux/list.h>
   6 #include <linux/ftrace.h>
   7
   8 /**
   9  * struct klp_ops - structure for tracking registered ftrace ops structs
  10  *
  11  * A single ftrace_ops is shared between all enabled replacement functions
  12  * (klp_func structs) which have the same old_addr.  This allows the switch
  13  * between function versions to happen instantaneously by updating the klp_ops
  14  * struct's func_stack list.  The winner is the klp_func at the top of the
  15  * func_stack (front of the list).
  16  *
  17  * @node:       node for the global klp_ops list
  18  * @func_stack: list head for the stack of klp_func's (active func is on top)
  19  * @fops:       registered ftrace ops struct
  20  */
  21 struct klp_ops {
  22         struct list_head node;
  23         struct list_head func_stack;
  24         struct ftrace_ops fops;
  25 };
  26
  27 struct klp_ops *klp_find_ops(unsigned long old_addr);
  28
  29 int klp_patch_object(struct klp_object *obj);
  30 void klp_unpatch_object(struct klp_object *obj);
  31 void klp_unpatch_objects(struct klp_patch *patch);
  32
  33 #endif /* _LIVEPATCH_PATCH_H */