linux-kernel - [PATCH RFC 4/8] sparc/jump_label: add arch_jump_label_transform

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Date:	Thu, 29 Sep 2011 16:26:34 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	"David S. Miller" <davem@...emloft.net>,
	David Daney <david.daney@...ium.com>,
	Michael Ellerman <michael@...erman.id.au>,
	Jan Glauber <jang@...ux.vnet.ibm.com>,
	Jason Baron <jbaron@...hat.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Xen Devel <xen-devel@...ts.xensource.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: [PATCH RFC 4/8] sparc/jump_label: add arch_jump_label_transform_early()

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>

This allows jump-label entries to be modified early, in a pre-SMP
environment.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Cc: David S. Miller <davem@...emloft.net>
---
 arch/sparc/kernel/jump_label.c |   24 +++++++++++++++---------
 1 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/arch/sparc/kernel/jump_label.c b/arch/sparc/kernel/jump_label.c
index ea2dafc..d3dad25 100644
--- a/arch/sparc/kernel/jump_label.c
+++ b/arch/sparc/kernel/jump_label.c
@@ -8,8 +8,8 @@
 
 #ifdef HAVE_JUMP_LABEL
 
-void arch_jump_label_transform(struct jump_entry *entry,
-			       enum jump_label_type type)
+static void __jump_label_transform(struct jump_entry *entry,
+				   enum jump_label_type type)
 {
 	u32 val;
 	u32 *insn = (u32 *) (unsigned long) entry->code;
@@ -28,20 +28,26 @@ void arch_jump_label_transform(struct jump_entry *entry,
 		val = 0x01000000;
 	}
 
-	get_online_cpus();
-	mutex_lock(&text_mutex);
 	*insn = val;
 	flushi(insn);
+}
+
+void arch_jump_label_transform(struct jump_entry *entry,
+			       enum jump_label_type type)
+{
+	get_online_cpus();
+	mutex_lock(&text_mutex);
+
+	__jump_label_transform(entry, type);
+
 	mutex_unlock(&text_mutex);
 	put_online_cpus();
 }
 
-void arch_jump_label_text_poke_early(jump_label_t addr)
+void __init arch_jump_label_transform_early(struct jump_entry *entry,
+					    enum jump_label_type type)
 {
-	u32 *insn_p = (u32 *) (unsigned long) addr;
-
-	*insn_p = 0x01000000;
-	flushi(insn_p);
+	__jump_label_transform(entry, type);
 }
 
 #endif
-- 
1.7.6.2

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