1c349cdcaSJosh Poimboeuf #ifndef _LIVEPATCH_PATCH_H 2c349cdcaSJosh Poimboeuf #define _LIVEPATCH_PATCH_H 3c349cdcaSJosh Poimboeuf 4c349cdcaSJosh Poimboeuf #include <linux/livepatch.h> 5c349cdcaSJosh Poimboeuf #include <linux/list.h> 6c349cdcaSJosh Poimboeuf #include <linux/ftrace.h> 7c349cdcaSJosh Poimboeuf 8c349cdcaSJosh Poimboeuf /** 9c349cdcaSJosh Poimboeuf * struct klp_ops - structure for tracking registered ftrace ops structs 10c349cdcaSJosh Poimboeuf * 11c349cdcaSJosh Poimboeuf * A single ftrace_ops is shared between all enabled replacement functions 12c349cdcaSJosh Poimboeuf * (klp_func structs) which have the same old_addr. This allows the switch 13c349cdcaSJosh Poimboeuf * between function versions to happen instantaneously by updating the klp_ops 14c349cdcaSJosh Poimboeuf * struct's func_stack list. The winner is the klp_func at the top of the 15c349cdcaSJosh Poimboeuf * func_stack (front of the list). 16c349cdcaSJosh Poimboeuf * 17c349cdcaSJosh Poimboeuf * @node: node for the global klp_ops list 18c349cdcaSJosh Poimboeuf * @func_stack: list head for the stack of klp_func's (active func is on top) 19c349cdcaSJosh Poimboeuf * @fops: registered ftrace ops struct 20c349cdcaSJosh Poimboeuf */ 21c349cdcaSJosh Poimboeuf struct klp_ops { 22c349cdcaSJosh Poimboeuf struct list_head node; 23c349cdcaSJosh Poimboeuf struct list_head func_stack; 24c349cdcaSJosh Poimboeuf struct ftrace_ops fops; 25c349cdcaSJosh Poimboeuf }; 26c349cdcaSJosh Poimboeuf 27c349cdcaSJosh Poimboeuf struct klp_ops *klp_find_ops(unsigned long old_addr); 28c349cdcaSJosh Poimboeuf 29c349cdcaSJosh Poimboeuf int klp_patch_object(struct klp_object *obj); 30c349cdcaSJosh Poimboeuf void klp_unpatch_object(struct klp_object *obj); 31c349cdcaSJosh Poimboeuf 32c349cdcaSJosh Poimboeuf #endif /* _LIVEPATCH_PATCH_H */ 33