linux-kernel - [PATCH 08/46] static_call, lto: Mark static keys as _

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Date:   Mon, 14 Nov 2022 12:43:06 +0100
From:   "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Andi Kleen <andi@...stfloor.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Jason Baron <jbaron@...mai.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Martin Liska <mliska@...e.cz>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 08/46] static_call, lto: Mark static keys as __visible

From: Andi Kleen <andi@...stfloor.org>

Symbols referenced from assembler (either directly or e.f. from
DEFINE_STATIC_KEY()) need to be global and visible in gcc LTO because
they could end up in a different object file than the assembler. This
can lead to linker errors without this patch.

So mark static call functions as __visible, namely static keys here.

Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Josh Poimboeuf <jpoimboe@...nel.org>
Cc: Jason Baron <jbaron@...mai.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Ard Biesheuvel <ardb@...nel.org>
Signed-off-by: Andi Kleen <andi@...stfloor.org>
Signed-off-by: Martin Liska <mliska@...e.cz>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 include/linux/static_call.h | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/include/linux/static_call.h b/include/linux/static_call.h
index df53bed9d71f..e629ab0c4ca3 100644
--- a/include/linux/static_call.h
+++ b/include/linux/static_call.h
@@ -182,7 +182,7 @@ extern long __static_call_return0(void);
 
 #define DEFINE_STATIC_CALL(name, _func)					\
 	DECLARE_STATIC_CALL(name, _func);				\
-	struct static_call_key STATIC_CALL_KEY(name) = {		\
+	__visible struct static_call_key STATIC_CALL_KEY(name) = {		\
 		.func = _func,						\
 		.type = 1,						\
 	};								\
@@ -190,7 +190,7 @@ extern long __static_call_return0(void);
 
 #define DEFINE_STATIC_CALL_NULL(name, _func)				\
 	DECLARE_STATIC_CALL(name, _func);				\
-	struct static_call_key STATIC_CALL_KEY(name) = {		\
+	__visible struct static_call_key STATIC_CALL_KEY(name) = {	\
 		.func = NULL,						\
 		.type = 1,						\
 	};								\
@@ -198,7 +198,7 @@ extern long __static_call_return0(void);
 
 #define DEFINE_STATIC_CALL_RET0(name, _func)				\
 	DECLARE_STATIC_CALL(name, _func);				\
-	struct static_call_key STATIC_CALL_KEY(name) = {		\
+	__visible struct static_call_key STATIC_CALL_KEY(name) = {		\
 		.func = __static_call_return0,				\
 		.type = 1,						\
 	};								\
@@ -227,14 +227,14 @@ static inline int static_call_init(void) { return 0; }
 
 #define DEFINE_STATIC_CALL(name, _func)					\
 	DECLARE_STATIC_CALL(name, _func);				\
-	struct static_call_key STATIC_CALL_KEY(name) = {		\
+	__visible struct static_call_key STATIC_CALL_KEY(name) = {		\
 		.func = _func,						\
 	};								\
 	ARCH_DEFINE_STATIC_CALL_TRAMP(name, _func)
 
 #define DEFINE_STATIC_CALL_NULL(name, _func)				\
 	DECLARE_STATIC_CALL(name, _func);				\
-	struct static_call_key STATIC_CALL_KEY(name) = {		\
+	__visible struct static_call_key STATIC_CALL_KEY(name) = {	\
 		.func = NULL,						\
 	};								\
 	ARCH_DEFINE_STATIC_CALL_NULL_TRAMP(name)
@@ -288,7 +288,7 @@ static inline long __static_call_return0(void)
 
 #define __DEFINE_STATIC_CALL(name, _func, _func_init)			\
 	DECLARE_STATIC_CALL(name, _func);				\
-	struct static_call_key STATIC_CALL_KEY(name) = {		\
+	__visible struct static_call_key STATIC_CALL_KEY(name) = {	\
 		.func = _func_init,					\
 	}
 
-- 
2.38.1