linux-kernel - [PATCH v2 21/23] x86: jump_label: introduce ASM_STATIC_KEY_INIT

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Date:   Tue,  9 Oct 2018 13:20:11 +0200
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Jason Baron <jbaron@...mai.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Rasmus Villemoes <linux@...musvillemoes.dk>, x86@...nel.org,
        Ingo Molnar <mingo@...nel.org>
Subject: [PATCH v2 21/23] x86: jump_label: introduce ASM_STATIC_KEY_INIT_{TRUE,FALSE}

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

Cc: x86@...nel.org
Reviewed-by: Ingo Molnar <mingo@...nel.org>
Acked-by: Jason Baron <jbaron@...mai.com>
Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 arch/x86/include/asm/jump_label.h | 18 ++++++++++++++++++
 include/linux/jump_label.h        |  2 ++
 2 files changed, 20 insertions(+)

diff --git a/arch/x86/include/asm/jump_label.h b/arch/x86/include/asm/jump_label.h
index 8c0de4282659..2736f7ff6806 100644
--- a/arch/x86/include/asm/jump_label.h
+++ b/arch/x86/include/asm/jump_label.h
@@ -110,4 +110,22 @@ struct jump_entry {
 
 #endif	/* __ASSEMBLY__ */
 
+#ifdef CONFIG_X86_64
+#define ASM_STATIC_KEY_INIT_TRUE					\
+	 "\t.long 1                              \t# .enabled\n"	\
+	 "\t.long 0                              \t# <padding>\n"	\
+	 "\t.quad "__stringify(__JUMP_TYPE_TRUE)"\t# .type\n"
+#define ASM_STATIC_KEY_INIT_FALSE					\
+	 "\t.long 0                               \t# .enabled\n"	\
+	 "\t.long 0                               \t# <padding>\n"	\
+	 "\t.quad "__stringify(__JUMP_TYPE_FALSE)"\t# .type\n"
+#else
+#define ASM_STATIC_KEY_INIT_TRUE					\
+	 "\t.long 1                              \t# .enabled\n"	\
+	 "\t.long "__stringify(__JUMP_TYPE_TRUE)"\t# .type\n"
+#define ASM_STATIC_KEY_INIT_FALSE					\
+	 "\t.long 0                               \t# .enabled\n"	\
+	 "\t.long "__stringify(__JUMP_TYPE_FALSE)"\t# .type\n"
+#endif
+
 #endif
diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
index 1a0b6f17a5d6..6e98193ae708 100644
--- a/include/linux/jump_label.h
+++ b/include/linux/jump_label.h
@@ -132,6 +132,8 @@ struct module;
 
 #ifdef HAVE_JUMP_LABEL
 
+#define __JUMP_TYPE_FALSE	0
+#define __JUMP_TYPE_TRUE	1
 #define JUMP_TYPE_FALSE		0UL
 #define JUMP_TYPE_TRUE		1UL
 #define JUMP_TYPE_LINKED	2UL
-- 
2.19.1.3.g1d92a00e68