linux-kernel - [PATCH v3 22/23] x86: jump_label: introduce asm macros STATIC_KEY_INIT{,_TRUE,

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Message-Id: <20181109231021.11658-23-linux@rasmusvillemoes.dk>
Date:   Sat, 10 Nov 2018 00:10:20 +0100
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Jason Baron <jbaron@...mai.com>
Cc:     linux-kernel@...r.kernel.org,
        Rasmus Villemoes <linux@...musvillemoes.dk>, x86@...nel.org,
        Ingo Molnar <mingo@...nel.org>
Subject: [PATCH v3 22/23] x86: jump_label: introduce asm macros STATIC_KEY_INIT{,_TRUE,_FALSE}

These will be useful when defining the contents of (a struct containing)
a static key in assembly.

Cc: x86@...nel.org
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Jason Baron <jbaron@...mai.com>
Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 arch/x86/include/asm/jump_label.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/x86/include/asm/jump_label.h b/arch/x86/include/asm/jump_label.h
index a5fb34fe56a4..f8b5c77ec96d 100644
--- a/arch/x86/include/asm/jump_label.h
+++ b/arch/x86/include/asm/jump_label.h
@@ -12,6 +12,7 @@
 
 #include <asm/asm.h>
 #include <asm/nops.h>
+#include <asm-generic/jump_label.h>
 
 #ifndef __ASSEMBLY__
 
@@ -64,6 +65,22 @@ static __always_inline bool arch_static_branch_jump(struct static_key *key, bool
 	.popsection
 .endm
 
+.macro STATIC_KEY_INIT enabled:req type:req
+	.long \enabled    # .enabled
+#ifdef CONFIG_X86_64
+	.long 0           # <padding>
+#endif
+	_ASM_PTR \type    # .type
+.endm
+
+.macro STATIC_KEY_INIT_TRUE
+	STATIC_KEY_INIT 1 JUMP_TYPE_TRUE
+.endm
+
+.macro STATIC_KEY_INIT_FALSE
+	STATIC_KEY_INIT 0 JUMP_TYPE_FALSE
+.endm
+
 #endif	/* __ASSEMBLY__ */
 
 #endif
-- 
2.19.1.6.gbde171bbf5