jump_label: if a key has already been initialized, don't nop it out
Jeremy Fitzhardinge [Thu, 29 Sep 2011 18:10:05 +0000 (11:10 -0700)]
If a key has been enabled before jump_label_init() is called, don't
nop it out.

This removes arch_jump_label_text_poke_early() (which can only nop
out a site) and uses arch_jump_label_transform() instead.

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>

include/linux/jump_label.h
kernel/jump_label.c

index 1213e9d..12e804e 100644 (file)
@@ -44,8 +44,7 @@ extern struct jump_entry __stop___jump_table[];
 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_text_poke_early(jump_label_t addr);
+                                     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);
index a8ce450..059202d 100644 (file)
@@ -121,13 +121,6 @@ static void __jump_label_update(struct jump_label_key *key,
        }
 }
 
-/*
- * Not all archs need this.
- */
-void __weak arch_jump_label_text_poke_early(jump_label_t addr)
-{
-}
-
 static __init int jump_label_init(void)
 {
        struct jump_entry *iter_start = __start___jump_table;
@@ -139,12 +132,15 @@ static __init int jump_label_init(void)
        jump_label_sort_entries(iter_start, iter_stop);
 
        for (iter = iter_start; iter < iter_stop; iter++) {
-               arch_jump_label_text_poke_early(iter->code);
-               if (iter->key == (jump_label_t)(unsigned long)key)
+               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);
+               if (iterk == key)
                        continue;
 
-               key = (struct jump_label_key *)(unsigned long)iter->key;
-               atomic_set(&key->enabled, 0);
+               key = iterk;
                key->entries = iter;
 #ifdef CONFIG_MODULES
                key->next = NULL;
@@ -212,7 +208,7 @@ void jump_label_apply_nops(struct module *mod)
                return;
 
        for (iter = iter_start; iter < iter_stop; iter++)
-               arch_jump_label_text_poke_early(iter->code);
+               arch_jump_label_transform(iter, JUMP_LABEL_DISABLE);
 }
 
 static int jump_label_add_module(struct module *mod)