jump_label: add arch_jump_label_transform_static() to optimise non-live code updates

When updating a newly loaded module, the code is definitely not yet
executing on any processor, so it can be updated with no need for any
heavyweight synchronization.

This patch adds arch_jump_label_static() which is implemented as
arch_jump_label_transform() by default, but architectures can override
it if it avoids, say, a call to stop_machine().

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: Jason Baron <jbaron@redhat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>

2 files changed, 17 insertions, 3 deletions

diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
index 12e804ea32ab..56594e45b011 100644
--- a/include/linux/jump_label.h
+++ b/include/linux/jump_label.h
@@ -45,6 +45,8 @@ extern void jump_label_lock(void);
 extern void jump_label_unlock(void);
 extern void arch_jump_label_transform(struct jump_entry *entry,
                                       enum jump_label_type type);
+extern void arch_jump_label_transform_static(struct jump_entry *entry,
+                                             enum jump_label_type type);
 extern int jump_label_text_reserved(void *start, void *end);
 extern void jump_label_inc(struct jump_label_key *key);
 extern void jump_label_dec(struct jump_label_key *key);
diff --git a/kernel/jump_label.c b/kernel/jump_label.c
index 059202d5b77a..ff2028f35aa8 100644
--- a/kernel/jump_label.c
+++ b/kernel/jump_label.c
@@ -104,6 +104,18 @@ static int __jump_label_text_reserved(struct jump_entry *iter_start,
         return 0;
 }
 
+/* 
+ * Update code which is definitely not currently executing.
+ * Architectures which need heavyweight synchronization to modify
+ * running code can override this to make the non-live update case
+ * cheaper.
+ */
+void __weak arch_jump_label_transform_static(struct jump_entry *entry,
+                                            enum jump_label_type type)
+{
+        arch_jump_label_transform(entry, type); 
+}
+
 static void __jump_label_update(struct jump_label_key *key,
                                 struct jump_entry *entry,
                                 struct jump_entry *stop, int enable)
@@ -135,8 +147,8 @@ static __init int jump_label_init(void)
                 struct jump_label_key *iterk;
 
                 iterk = (struct jump_label_key *)(unsigned long)iter->key;
-                arch_jump_label_transform(iter, jump_label_enabled(iterk) ?
-                                          JUMP_LABEL_ENABLE : JUMP_LABEL_DISABLE);
+                arch_jump_label_transform_static(iter, jump_label_enabled(iterk) ?
+                                                 JUMP_LABEL_ENABLE : JUMP_LABEL_DISABLE);
                 if (iterk == key)
                         continue;
 
@@ -208,7 +220,7 @@ void jump_label_apply_nops(struct module *mod)
                 return;
 
         for (iter = iter_start; iter < iter_stop; iter++)
-                arch_jump_label_transform(iter, JUMP_LABEL_DISABLE);
+                arch_jump_label_transform_static(iter, JUMP_LABEL_DISABLE);
 }
 
 static int jump_label_add_module(struct module *mod)