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From: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org, ralf@linux-mips.org,
	linux-kernel@vger.kernel.org, rostedt@goodmis.org,
	jbaron@redhat.com
Cc: David Daney <ddaney@caviumnetworks.com>,
	David Miller <davem@davemloft.net>
Subject: [PATCH v2 1/2] jump label: Make arch_jump_label_text_poke_early() optional
Date: Mon,  4 Oct 2010 11:56:54 -0700	[thread overview]
Message-ID: <1286218615-24011-2-git-send-email-ddaney@caviumnetworks.com> (raw)
In-Reply-To: <1286218615-24011-1-git-send-email-ddaney@caviumnetworks.com>

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@caviumnetworks.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Jason Baron <jbaron@redhat.com>
Cc: David Miller <davem@davemloft.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


  reply	other threads:[~2010-10-04 18:57 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-10-04 18:56 [PATCH v2 0/2] jump label: Add MIPS architecture support David Daney
2010-10-04 18:56 ` David Daney [this message]
2010-10-04 18:56 ` [PATCH v2 2/2] jump label: Add MIPS support David Daney
2010-10-06 23:00   ` Ralf Baechle
2010-10-07  1:26     ` David Daney
2010-10-15 20:09 [PATCH 0/9] [GIT PULL] jump label: various updates Steven Rostedt
2010-10-15 20:09 ` [PATCH 1/9] jump label/x86: Move arch_init_ideal_nop5 later Steven Rostedt
2010-10-15 20:09 ` [PATCH 2/9] tracing/x86: No need to disable interrupts when calling arch_init_ideal_nop5 Steven Rostedt
2010-10-15 20:09 ` [PATCH 3/9] jump label: Fix module __init section race Steven Rostedt
2010-10-16  2:09   ` Steven Rostedt
2010-10-16  6:23     ` Ingo Molnar
2010-10-16 16:23       ` Steven Rostedt
2010-10-18 14:14         ` Jason Baron
2010-10-15 20:09 ` [PATCH 4/9] jump label: Fix deadlock b/w jump_label_mutex vs. text_mutex Steven Rostedt
2010-10-15 20:55   ` Peter Zijlstra
2010-10-16  2:16     ` Steven Rostedt
2010-10-16  2:25     ` Steven Rostedt
2010-10-16  4:21       ` Steven Rostedt
2010-10-15 20:09 ` [PATCH 5/9] jump label: Add register_jump_label_key/unregister_jump_label_key Steven Rostedt
2010-10-15 20:58   ` Peter Zijlstra
2010-10-16  2:11     ` Steven Rostedt
2010-10-15 21:03   ` Peter Zijlstra
2010-10-15 21:09     ` Steven Rostedt
2010-10-15 21:13       ` Peter Zijlstra
2010-10-18 12:05         ` Peter Zijlstra
2010-10-18 14:03           ` Jason Baron
2010-10-18 14:07             ` Peter Zijlstra
2010-10-15 20:09 ` [PATCH 6/9] jump label: Move jump table to r/w section Steven Rostedt
2010-10-15 20:09 ` [PATCH 7/9] jump label: Add docs Steven Rostedt
2010-10-15 20:09 ` [PATCH 8/9] jump label: Make arch_jump_label_text_poke_early() optional Steven Rostedt
2010-10-15 21:06   ` Peter Zijlstra
2010-10-15 21:08     ` Steven Rostedt
2010-10-15 21:22       ` David Daney
2010-10-15 21:35         ` Steven Rostedt
2010-10-15 21:38           ` David Daney
2010-10-16  1:08             ` Steven Rostedt
2010-10-30 10:40   ` [tip:perf/urgent] " tip-bot for Steven Rostedt
2010-10-15 20:09 ` [PATCH 9/9] jump label: Add MIPS support Steven Rostedt
2010-10-15 20:17 ` [PATCH 0/9] [GIT PULL] jump label: various updates Steven Rostedt
2010-10-16  1:10 ` Steven Rostedt

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