include/linux/static_call.h

17  *   DECLARE_STATIC_CALL(name, func);
18  *   DEFINE_STATIC_CALL(name, func);
19  *   DEFINE_STATIC_CALL_NULL(name, typename);
20  *   DEFINE_STATIC_CALL_RET0(name, typename);
24  *   static_call(name)(args...);
25  *   static_call_cond(name)(args...);
26  *   static_call_update(name, func);
27  *   static_call_query(name);
55  *   Each static_call() site calls into a trampoline associated with the name.
57  *   name will modify the trampoline's branch destination.
97  *     static_call_cond(name)(arg1);
104  *   func = static_call_query(name);
146 #define STATIC_CALL_TRAMP_ADDR(name) &STATIC_CALL_TRAMP(name)
149 #define STATIC_CALL_TRAMP_ADDR(name) NULL
152 #define static_call_update(name, func)					\
154 	typeof(&STATIC_CALL_TRAMP(name)) __F = (func);			\
155 	__static_call_update(&STATIC_CALL_KEY(name),			\
156 			     STATIC_CALL_TRAMP_ADDR(name), __F);	\
159 #define static_call_query(name) (READ_ONCE(STATIC_CALL_KEY(name).func))
185 #define DEFINE_STATIC_CALL(name, _func)					\
186 	DECLARE_STATIC_CALL(name, _func);				\
187 	struct static_call_key STATIC_CALL_KEY(name) = {		\
191 	ARCH_DEFINE_STATIC_CALL_TRAMP(name, _func)
193 #define DEFINE_STATIC_CALL_NULL(name, _func)				\
194 	DECLARE_STATIC_CALL(name, _func);				\
195 	struct static_call_key STATIC_CALL_KEY(name) = {		\
199 	ARCH_DEFINE_STATIC_CALL_NULL_TRAMP(name)
201 #define DEFINE_STATIC_CALL_RET0(name, _func)				\
202 	DECLARE_STATIC_CALL(name, _func);				\
203 	struct static_call_key STATIC_CALL_KEY(name) = {		\
207 	ARCH_DEFINE_STATIC_CALL_RET0_TRAMP(name)
209 #define static_call_cond(name)	(void)__static_call(name)
211 #define EXPORT_STATIC_CALL(name)					\
212 	EXPORT_SYMBOL(STATIC_CALL_KEY(name));				\
213 	EXPORT_SYMBOL(STATIC_CALL_TRAMP(name))
214 #define EXPORT_STATIC_CALL_GPL(name)					\
215 	EXPORT_SYMBOL_GPL(STATIC_CALL_KEY(name));			\
216 	EXPORT_SYMBOL_GPL(STATIC_CALL_TRAMP(name))
219 #define EXPORT_STATIC_CALL_TRAMP(name)					\
220 	EXPORT_SYMBOL(STATIC_CALL_TRAMP(name));				\
221 	ARCH_ADD_TRAMP_KEY(name)
222 #define EXPORT_STATIC_CALL_TRAMP_GPL(name)				\
223 	EXPORT_SYMBOL_GPL(STATIC_CALL_TRAMP(name));			\
224 	ARCH_ADD_TRAMP_KEY(name)
230 #define DEFINE_STATIC_CALL(name, _func)					\
231 	DECLARE_STATIC_CALL(name, _func);				\
232 	struct static_call_key STATIC_CALL_KEY(name) = {		\
235 	ARCH_DEFINE_STATIC_CALL_TRAMP(name, _func)
237 #define DEFINE_STATIC_CALL_NULL(name, _func)				\
238 	DECLARE_STATIC_CALL(name, _func);				\
239 	struct static_call_key STATIC_CALL_KEY(name) = {		\
242 	ARCH_DEFINE_STATIC_CALL_NULL_TRAMP(name)
244 #define DEFINE_STATIC_CALL_RET0(name, _func)				\
245 	DECLARE_STATIC_CALL(name, _func);				\
246 	struct static_call_key STATIC_CALL_KEY(name) = {		\
249 	ARCH_DEFINE_STATIC_CALL_RET0_TRAMP(name)
251 #define static_call_cond(name)	(void)__static_call(name)
269 #define EXPORT_STATIC_CALL(name)					\
270 	EXPORT_SYMBOL(STATIC_CALL_KEY(name));				\
271 	EXPORT_SYMBOL(STATIC_CALL_TRAMP(name))
272 #define EXPORT_STATIC_CALL_GPL(name)					\
273 	EXPORT_SYMBOL_GPL(STATIC_CALL_KEY(name));			\
274 	EXPORT_SYMBOL_GPL(STATIC_CALL_TRAMP(name))
277 #define EXPORT_STATIC_CALL_TRAMP(name)					\
278 	EXPORT_SYMBOL(STATIC_CALL_TRAMP(name))
279 #define EXPORT_STATIC_CALL_TRAMP_GPL(name)				\
280 	EXPORT_SYMBOL_GPL(STATIC_CALL_TRAMP(name))
291 #define __DEFINE_STATIC_CALL(name, _func, _func_init)			\
292 	DECLARE_STATIC_CALL(name, _func);				\
293 	struct static_call_key STATIC_CALL_KEY(name) = {		\
297 #define DEFINE_STATIC_CALL(name, _func)					\
298 	__DEFINE_STATIC_CALL(name, _func, _func)
300 #define DEFINE_STATIC_CALL_NULL(name, _func)				\
301 	__DEFINE_STATIC_CALL(name, _func, NULL)
303 #define DEFINE_STATIC_CALL_RET0(name, _func)				\
304 	__DEFINE_STATIC_CALL(name, _func, __static_call_return0)
320 #define __static_call_cond(name)					\
322 	void *func = READ_ONCE(STATIC_CALL_KEY(name).func);		\
325 	(typeof(STATIC_CALL_TRAMP(name))*)func;				\
328 #define static_call_cond(name)	(void)__static_call_cond(name)
341 #define EXPORT_STATIC_CALL(name)	EXPORT_SYMBOL(STATIC_CALL_KEY(name))
342 #define EXPORT_STATIC_CALL_GPL(name)	EXPORT_SYMBOL_GPL(STATIC_CALL_KEY(name))