kernel/livepatch/shadow.c

14  * <obj, id> pair and a pointer value.  It is the responsibility of the
50  * @obj:	pointer to parent object
57 	void *obj;
63  * klp_shadow_match() - verify a shadow variable matches given <obj, id>
65  * @obj:	pointer to parent object
70 static inline bool klp_shadow_match(struct klp_shadow *shadow, void *obj,
73 	return shadow->obj == obj && shadow->id == id;
78  * @obj:	pointer to parent object
83 void *klp_shadow_get(void *obj, unsigned long id)
90 				   (unsigned long)obj) {
92 		if (klp_shadow_match(shadow, obj, id)) {
104 static void *__klp_shadow_get_or_alloc(void *obj, unsigned long id,
114 	shadow_data = klp_shadow_get(obj, id);
127 	/* Look for <obj, id> again under the lock */
129 	shadow_data = klp_shadow_get(obj, id);
140 	new_shadow->obj = obj;
146 		err = ctor(obj, new_shadow->data, ctor_data);
151 			       obj, id, err);
156 	/* No <obj, id> found, so attach the newly allocated one */
158 		     (unsigned long)new_shadow->obj);
165 		WARN(1, "Duplicate shadow variable <%p, %lx>\n", obj, id);
174  * @obj:	pointer to parent object
186  * If an existing <obj, id> shadow variable can be found, this routine will
196 void *klp_shadow_alloc(void *obj, unsigned long id,
200 	return __klp_shadow_get_or_alloc(obj, id, size, gfp_flags,
207  * @obj:	pointer to parent object
214  * Returns a pointer to existing shadow data if an <obj, id> shadow
219  * @id for the given @obj.  It also guarantees that the constructor function
225 void *klp_shadow_get_or_alloc(void *obj, unsigned long id,
229 	return __klp_shadow_get_or_alloc(obj, id, size, gfp_flags,
239 		dtor(shadow->obj, shadow->data);
244  * klp_shadow_free() - detach and free a <obj, id> shadow variable
245  * @obj:	pointer to parent object
250  * This function releases the memory for this <obj, id> shadow variable
253 void klp_shadow_free(void *obj, unsigned long id, klp_shadow_dtor_t dtor)
260 	/* Delete <obj, id> from hash */
262 			       (unsigned long)obj) {
264 		if (klp_shadow_match(shadow, obj, id)) {
293 		if (klp_shadow_match(shadow, shadow->obj, id))