linux-kernel - [PATCH RFC 5/8] mips/jump_label: add arch_jump_label_transform

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Date:	Thu, 29 Sep 2011 16:26:35 -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 5/8] mips/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.

XXX TODO: make sure idling CPUs flush their icaches before continuing
in case this modifies something that's adjacent to their init-idle loops.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Cc: David Daney <david.daney@...ium.com>
---
 arch/mips/kernel/jump_label.c |   21 +++++++++++++++++----
 1 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/arch/mips/kernel/jump_label.c b/arch/mips/kernel/jump_label.c
index 6001610..ddc9a65 100644
--- a/arch/mips/kernel/jump_label.c
+++ b/arch/mips/kernel/jump_label.c
@@ -20,8 +20,8 @@
 
 #define J_RANGE_MASK ((1ul << 28) - 1)
 
-void arch_jump_label_transform(struct jump_entry *e,
-			       enum jump_label_type type)
+static void __jump_label_transform(struct jump_entry *e,
+				   enum jump_label_type type)
 {
 	union mips_instruction insn;
 	union mips_instruction *insn_p =
@@ -40,15 +40,28 @@ void arch_jump_label_transform(struct jump_entry *e,
 		insn.word = 0; /* nop */
 	}
 
-	get_online_cpus();
-	mutex_lock(&text_mutex);
 	*insn_p = insn;
 
 	flush_icache_range((unsigned long)insn_p,
 			   (unsigned long)insn_p + sizeof(*insn_p));
+}
+
+void arch_jump_label_transform(struct jump_entry *e,
+			       enum jump_label_type type)
+{
+	get_online_cpus();
+	mutex_lock(&text_mutex);
+
+	__jump_label_tranform(e, type);
 
 	mutex_unlock(&text_mutex);
 	put_online_cpus();
 }
 
+void __init arch_jump_label_transform_early(struct jump_entry *e,
+					    enum jump_label_type type)
+{
+	__jump_label_tranform(e, type);
+}
+
 #endif /* HAVE_JUMP_LABEL */
-- 
1.7.6.2

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