WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

[Xen-devel] [PATCH RFC 4/8] sparc/jump_label: add arch_jump_label_transf

To: Steven Rostedt <rostedt@xxxxxxxxxxx>
Subject: [Xen-devel] [PATCH RFC 4/8] sparc/jump_label: add arch_jump_label_transform_early()
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Thu, 29 Sep 2011 16:26:34 -0700
Cc: Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Jan Glauber <jang@xxxxxxxxxxxxxxxxxx>, Jason Baron <jbaron@xxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, David Daney <david.daney@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Michael Ellerman <michael@xxxxxxxxxxxxxx>, Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>
Delivery-date: Thu, 29 Sep 2011 16:36:07 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <cover.1317338254.git.jeremy.fitzhardinge@xxxxxxxxxx>
In-reply-to: <cover.1317338254.git.jeremy.fitzhardinge@xxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <cover.1317338254.git.jeremy.fitzhardinge@xxxxxxxxxx>
References: <cover.1317338254.git.jeremy.fitzhardinge@xxxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
From: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>

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

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
---
 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


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

<Prev in Thread] Current Thread [Next in Thread>