[linux-2.6-block.git] / kernel / livepatch / patch.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LIVEPATCH_PATCH_H
#define _LIVEPATCH_PATCH_H

#include <linux/livepatch.h>
#include <linux/list.h>
#include <linux/ftrace.h>

/**
 * struct klp_ops - structure for tracking registered ftrace ops structs
 *
 * A single ftrace_ops is shared between all enabled replacement functions
 * (klp_func structs) which have the same old_addr.  This allows the switch
 * between function versions to happen instantaneously by updating the klp_ops
 * struct's func_stack list.  The winner is the klp_func at the top of the
 * func_stack (front of the list).
 *
 * @node:	node for the global klp_ops list
 * @func_stack:	list head for the stack of klp_func's (active func is on top)
 * @fops:	registered ftrace ops struct
 */
struct klp_ops {
	struct list_head node;
	struct list_head func_stack;
	struct ftrace_ops fops;
};

struct klp_ops *klp_find_ops(unsigned long old_addr);

int klp_patch_object(struct klp_object *obj);
void klp_unpatch_object(struct klp_object *obj);
void klp_unpatch_objects(struct klp_patch *patch);

#endif /* _LIVEPATCH_PATCH_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
c349cdca JP	2	#ifndef _LIVEPATCH_PATCH_H
	3	#define _LIVEPATCH_PATCH_H
	4
	5	#include <linux/livepatch.h>
	6	#include <linux/list.h>
	7	#include <linux/ftrace.h>
	8
	9	/**
	10	* struct klp_ops - structure for tracking registered ftrace ops structs
	11	*
	12	* A single ftrace_ops is shared between all enabled replacement functions
	13	* (klp_func structs) which have the same old_addr. This allows the switch
	14	* between function versions to happen instantaneously by updating the klp_ops
	15	* struct's func_stack list. The winner is the klp_func at the top of the
	16	* func_stack (front of the list).
	17	*
	18	* @node: node for the global klp_ops list
	19	* @func_stack: list head for the stack of klp_func's (active func is on top)
	20	* @fops: registered ftrace ops struct
	21	*/
	22	struct klp_ops {
	23	struct list_head node;
	24	struct list_head func_stack;
	25	struct ftrace_ops fops;
	26	};
	27
	28	struct klp_ops *klp_find_ops(unsigned long old_addr);
	29
	30	int klp_patch_object(struct klp_object *obj);
	31	void klp_unpatch_object(struct klp_object *obj);
d83a7cb3	32	void klp_unpatch_objects(struct klp_patch *patch);
c349cdca JP	33
c349cdca JP	34	#endif /* _LIVEPATCH_PATCH_H */