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Diffstat (limited to 'kernel/jump_label.c')
-rw-r--r--kernel/jump_label.c25
1 files changed, 16 insertions, 9 deletions
diff --git a/kernel/jump_label.c b/kernel/jump_label.c
index 96d8945c8bf3..85a2a0086c67 100644
--- a/kernel/jump_label.c
+++ b/kernel/jump_label.c
@@ -56,6 +56,11 @@ jump_label_sort_entries(struct jump_entry *start, struct jump_entry *stop)
static void jump_label_update(struct static_key *key, int enable);
+static inline bool static_key_type(struct static_key *key)
+{
+ return (unsigned long)key->entries & JUMP_TYPE_MASK;
+}
+
void static_key_slow_inc(struct static_key *key)
{
STATIC_KEY_CHECK_USE();
@@ -64,7 +69,7 @@ void static_key_slow_inc(struct static_key *key)
jump_label_lock();
if (atomic_read(&key->enabled) == 0) {
- if (!jump_label_get_branch_default(key))
+ if (!static_key_type(key))
jump_label_update(key, JUMP_LABEL_JMP);
else
jump_label_update(key, JUMP_LABEL_NOP);
@@ -87,7 +92,7 @@ static void __static_key_slow_dec(struct static_key *key,
atomic_inc(&key->enabled);
schedule_delayed_work(work, rate_limit);
} else {
- if (!jump_label_get_branch_default(key))
+ if (!static_key_type(key))
jump_label_update(key, JUMP_LABEL_NOP);
else
jump_label_update(key, JUMP_LABEL_JMP);
@@ -178,15 +183,17 @@ static void __jump_label_update(struct static_key *key,
}
}
-static enum jump_label_type jump_label_type(struct static_key *key)
+static inline struct jump_entry *static_key_entries(struct static_key *key)
{
- bool true_branch = jump_label_get_branch_default(key);
- bool state = static_key_enabled(key);
+ return (struct jump_entry *)((unsigned long)key->entries & ~JUMP_TYPE_MASK);
+}
- if ((!true_branch && state) || (true_branch && !state))
- return JUMP_LABEL_JMP;
+static enum jump_label_type jump_label_type(struct static_key *key)
+{
+ bool enabled = static_key_enabled(key);
+ bool type = static_key_type(key);
- return JUMP_LABEL_NOP;
+ return enabled ^ type;
}
void __init jump_label_init(void)
@@ -442,7 +449,7 @@ int jump_label_text_reserved(void *start, void *end)
static void jump_label_update(struct static_key *key, int enable)
{
struct jump_entry *stop = __stop___jump_table;
- struct jump_entry *entry = jump_label_get_entries(key);
+ struct jump_entry *entry = static_key_entries(key);
#ifdef CONFIG_MODULES
struct module *mod;