linux-kernel - [PATCH v2 1/2] jump label: Make arch_jump_label_text_poke

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Date:	Mon,  4 Oct 2010 11:56:54 -0700
From:	David Daney <ddaney@...iumnetworks.com>
To:	linux-mips@...ux-mips.org, ralf@...ux-mips.org,
	linux-kernel@...r.kernel.org, rostedt@...dmis.org,
	jbaron@...hat.com
Cc:	David Daney <ddaney@...iumnetworks.com>,
	David Miller <davem@...emloft.net>
Subject: [PATCH v2 1/2] jump label: Make arch_jump_label_text_poke_early() optional

For the forthcoming MIPS jump label support,
arch_jump_label_text_poke_early() is unneeded as the MIPS NOP
instruction is already optimal.

Supply a default implementation that does nothing.  Flag x86 and SPARC
as having arch_jump_label_text_poke_early().

Signed-off-by: David Daney <ddaney@...iumnetworks.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Jason Baron <jbaron@...hat.com>
Cc: David Miller <davem@...emloft.net>
---
 arch/sparc/include/asm/jump_label.h |    1 +
 arch/x86/include/asm/jump_label.h   |    1 +
 include/linux/jump_label.h          |    6 ++++++
 3 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/arch/sparc/include/asm/jump_label.h b/arch/sparc/include/asm/jump_label.h
index 62e66d7..9aa82d7 100644
--- a/arch/sparc/include/asm/jump_label.h
+++ b/arch/sparc/include/asm/jump_label.h
@@ -6,6 +6,7 @@
 #include <linux/types.h>
 #include <asm/system.h>
 
+#define HAVE_ARCH_JUMP_LABEL_TEXT_POKE_EARLY
 #define JUMP_LABEL_NOP_SIZE 4
 
 #define JUMP_LABEL(key, label)					\
diff --git a/arch/x86/include/asm/jump_label.h b/arch/x86/include/asm/jump_label.h
index f52d42e..169cfd8 100644
--- a/arch/x86/include/asm/jump_label.h
+++ b/arch/x86/include/asm/jump_label.h
@@ -6,6 +6,7 @@
 #include <linux/types.h>
 #include <asm/nops.h>
 
+#define HAVE_ARCH_JUMP_LABEL_TEXT_POKE_EARLY
 #define JUMP_LABEL_NOP_SIZE 5
 
 # define JUMP_LABEL_INITIAL_NOP ".byte 0xe9 \n\t .long 0\n\t"
diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
index b72cd9f..e98ad3a 100644
--- a/include/linux/jump_label.h
+++ b/include/linux/jump_label.h
@@ -20,7 +20,13 @@ extern struct jump_entry __stop___jump_table[];
 
 extern void arch_jump_label_transform(struct jump_entry *entry,
 				 enum jump_label_type type);
+
+#ifdef HAVE_ARCH_JUMP_LABEL_TEXT_POKE_EARLY
 extern void arch_jump_label_text_poke_early(jump_label_t addr);
+#else
+static inline void arch_jump_label_text_poke_early(jump_label_t addr) {}
+#endif
+
 extern void jump_label_update(unsigned long key, enum jump_label_type type);
 extern void jump_label_apply_nops(struct module *mod);
 extern int jump_label_text_reserved(void *start, void *end);
-- 
1.7.2.2

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