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authorFrederic Weisbecker <frederic@kernel.org>2021-01-18 15:12:17 +0100
committerIngo Molnar <mingo@kernel.org>2021-02-17 14:08:51 +0100
commit29fd01944b7273bb630c649a2104b7f9e4ef3fa6 (patch)
tree5ca11e02c8d27cd794d1a0d1b6e221dfb004d2ad /include
parent3f2a8fc4b15de18644e8a80a09edda168676e22c (diff)
static_call: Provide DEFINE_STATIC_CALL_RET0()
DECLARE_STATIC_CALL() must pass the original function targeted for a given static call. But DEFINE_STATIC_CALL() may want to initialize it as off. In this case we can't pass NULL (for functions without return value) or __static_call_return0 (for functions returning a value) directly to DEFINE_STATIC_CALL() as that may trigger a static call redeclaration with a different function prototype. Type casts neither can work around that as they don't get along with typeof(). The proper way to do that for functions that don't return a value is to use DEFINE_STATIC_CALL_NULL(). But functions returning a actual value don't have an equivalent yet. Provide DEFINE_STATIC_CALL_RET0() to solve this situation. Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lkml.kernel.org/r/20210118141223.123667-3-frederic@kernel.org
Diffstat (limited to 'include')
-rw-r--r--include/linux/static_call.h22
1 files changed, 14 insertions, 8 deletions
diff --git a/include/linux/static_call.h b/include/linux/static_call.h
index bd6735d10e2e..d69dd8b976ca 100644
--- a/include/linux/static_call.h
+++ b/include/linux/static_call.h
@@ -144,13 +144,13 @@ extern int static_call_text_reserved(void *start, void *end);
extern long __static_call_return0(void);
-#define DEFINE_STATIC_CALL(name, _func) \
+#define __DEFINE_STATIC_CALL(name, _func, _func_init) \
DECLARE_STATIC_CALL(name, _func); \
struct static_call_key STATIC_CALL_KEY(name) = { \
- .func = _func, \
+ .func = _func_init, \
.type = 1, \
}; \
- ARCH_DEFINE_STATIC_CALL_TRAMP(name, _func)
+ ARCH_DEFINE_STATIC_CALL_TRAMP(name, _func_init)
#define DEFINE_STATIC_CALL_NULL(name, _func) \
DECLARE_STATIC_CALL(name, _func); \
@@ -178,12 +178,12 @@ struct static_call_key {
void *func;
};
-#define DEFINE_STATIC_CALL(name, _func) \
+#define __DEFINE_STATIC_CALL(name, _func, _func_init) \
DECLARE_STATIC_CALL(name, _func); \
struct static_call_key STATIC_CALL_KEY(name) = { \
- .func = _func, \
+ .func = _func_init, \
}; \
- ARCH_DEFINE_STATIC_CALL_TRAMP(name, _func)
+ ARCH_DEFINE_STATIC_CALL_TRAMP(name, _func_init)
#define DEFINE_STATIC_CALL_NULL(name, _func) \
DECLARE_STATIC_CALL(name, _func); \
@@ -234,10 +234,10 @@ static inline long __static_call_return0(void)
return 0;
}
-#define DEFINE_STATIC_CALL(name, _func) \
+#define __DEFINE_STATIC_CALL(name, _func, _func_init) \
DECLARE_STATIC_CALL(name, _func); \
struct static_call_key STATIC_CALL_KEY(name) = { \
- .func = _func, \
+ .func = _func_init, \
}
#define DEFINE_STATIC_CALL_NULL(name, _func) \
@@ -286,4 +286,10 @@ static inline int static_call_text_reserved(void *start, void *end)
#endif /* CONFIG_HAVE_STATIC_CALL */
+#define DEFINE_STATIC_CALL(name, _func) \
+ __DEFINE_STATIC_CALL(name, _func, _func)
+
+#define DEFINE_STATIC_CALL_RET0(name, _func) \
+ __DEFINE_STATIC_CALL(name, _func, __static_call_return0)
+
#endif /* _LINUX_STATIC_CALL_H */