linux-kernel - [PATCH v2 1/1] arm64: simplify arch_static_branch/

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Date: Thu, 25 Apr 2024 17:21:18 +0800
From: George Guo <dongtai.guo@...ux.dev>
To: mark.rutland@....com
Cc: ardb@...nel.org,
	catalin.marinas@....com,
	dongtai.guo@...ux.dev,
	guodongtai@...inos.cn,
	jbaron@...mai.com,
	jpoimboe@...nel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	peterz@...radead.org,
	rostedt@...dmis.org,
	will@...nel.org
Subject: [PATCH v2 1/1] arm64: simplify arch_static_branch/_jump function

From: George Guo <guodongtai@...inos.cn>

Extracted the jump table definition code from the arch_static_branch and
arch_static_branch_jump functions into a macro JUMP_TABLE_ENTRY to reduce
code duplication and improve readability.

Signed-off-by: George Guo <guodongtai@...inos.cn>
---
 arch/arm64/include/asm/jump_label.h | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/include/asm/jump_label.h b/arch/arm64/include/asm/jump_label.h
index 6aafbb789991..69407b70821e 100644
--- a/arch/arm64/include/asm/jump_label.h
+++ b/arch/arm64/include/asm/jump_label.h
@@ -15,16 +15,19 @@
 
 #define JUMP_LABEL_NOP_SIZE		AARCH64_INSN_SIZE
 
+#define JUMP_TABLE_ENTRY				\
+	 ".pushsection	__jump_table, \"aw\"	\n\t"	\
+	 ".align	3			\n\t"	\
+	 ".long		1b - ., %l[l_yes] - .	\n\t"	\
+	 ".quad		%c0 - .			\n\t"	\
+	 ".popsection				\n\t"
+
 static __always_inline bool arch_static_branch(struct static_key * const key,
 					       const bool branch)
 {
 	asm goto(
 		"1:	nop					\n\t"
-		 "	.pushsection	__jump_table, \"aw\"	\n\t"
-		 "	.align		3			\n\t"
-		 "	.long		1b - ., %l[l_yes] - .	\n\t"
-		 "	.quad		%c0 - .			\n\t"
-		 "	.popsection				\n\t"
+		JUMP_TABLE_ENTRY
 		 :  :  "i"(&((char *)key)[branch]) :  : l_yes);
 
 	return false;
@@ -37,11 +40,7 @@ static __always_inline bool arch_static_branch_jump(struct static_key * const ke
 {
 	asm goto(
 		"1:	b		%l[l_yes]		\n\t"
-		 "	.pushsection	__jump_table, \"aw\"	\n\t"
-		 "	.align		3			\n\t"
-		 "	.long		1b - ., %l[l_yes] - .	\n\t"
-		 "	.quad		%c0 - .			\n\t"
-		 "	.popsection				\n\t"
+		JUMP_TABLE_ENTRY
 		 :  :  "i"(&((char *)key)[branch]) :  : l_yes);
 
 	return false;
-- 
2.34.1