linux-kernel - [PATCH] static_call: Fix return type of static_call

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Message-Id: <20200928230939.5574-1-natechancellor@gmail.com>
Date:   Mon, 28 Sep 2020 16:09:39 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH] static_call: Fix return type of static_call_init

Functions that are passed to early_initcall should be of type
initcall_t, which expects a return type of int. This is not currently an
error but a patch in the Clang LTO series could change that in the
future.

Fixes: 9183c3f9ed71 ("static_call: Add inline static call infrastructure")
Link: https://lore.kernel.org/lkml/20200904044559.GA507165@ubuntu-n2-xlarge-x86/
Link: https://lore.kernel.org/lkml/20200903203053.3411268-17-samitolvanen@google.com/
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
---
 include/linux/static_call.h | 6 +++---
 kernel/static_call.c        | 5 +++--
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/include/linux/static_call.h b/include/linux/static_call.h
index bfa2ba39be57..695da4c9b338 100644
--- a/include/linux/static_call.h
+++ b/include/linux/static_call.h
@@ -136,7 +136,7 @@ extern void arch_static_call_transform(void *site, void *tramp, void *func, bool
 
 #ifdef CONFIG_HAVE_STATIC_CALL_INLINE
 
-extern void __init static_call_init(void);
+extern int __init static_call_init(void);
 
 struct static_call_mod {
 	struct static_call_mod *next;
@@ -187,7 +187,7 @@ extern int static_call_text_reserved(void *start, void *end);
 
 #elif defined(CONFIG_HAVE_STATIC_CALL)
 
-static inline void static_call_init(void) { }
+static inline int static_call_init(void) { return 0; }
 
 struct static_call_key {
 	void *func;
@@ -234,7 +234,7 @@ static inline int static_call_text_reserved(void *start, void *end)
 
 #else /* Generic implementation */
 
-static inline void static_call_init(void) { }
+static inline int static_call_init(void) { return 0; }
 
 struct static_call_key {
 	void *func;
diff --git a/kernel/static_call.c b/kernel/static_call.c
index f8362b3f8fd5..84565c2a41b8 100644
--- a/kernel/static_call.c
+++ b/kernel/static_call.c
@@ -410,12 +410,12 @@ int static_call_text_reserved(void *start, void *end)
 	return __static_call_mod_text_reserved(start, end);
 }
 
-void __init static_call_init(void)
+int __init static_call_init(void)
 {
 	int ret;
 
 	if (static_call_initialized)
-		return;
+		return 0;
 
 	cpus_read_lock();
 	static_call_lock();
@@ -434,6 +434,7 @@ void __init static_call_init(void)
 #ifdef CONFIG_MODULES
 	register_module_notifier(&static_call_module_nb);
 #endif
+	return 0;
 }
 early_initcall(static_call_init);
 

base-commit: de394e7568ce2cdb4643ed230169f484f25f9442
-- 
2.28.0