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-rw-r--r--include/linux/jump_label.h11
-rw-r--r--init/main.c1
-rw-r--r--kernel/jump_label.c48
3 files changed, 18 insertions, 42 deletions
diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
index 2768a925bafa..5df6a621e464 100644
--- a/include/linux/jump_label.h
+++ b/include/linux/jump_label.h
@@ -141,7 +141,7 @@ static inline unsigned long jump_entry_target(const struct jump_entry *entry)
static inline struct static_key *jump_entry_key(const struct jump_entry *entry)
{
- long offset = entry->key & ~1L;
+ long offset = entry->key & ~3L;
return (struct static_key *)((unsigned long)&entry->key + offset);
}
@@ -160,7 +160,7 @@ static inline unsigned long jump_entry_target(const struct jump_entry *entry)
static inline struct static_key *jump_entry_key(const struct jump_entry *entry)
{
- return (struct static_key *)((unsigned long)entry->key & ~1UL);
+ return (struct static_key *)((unsigned long)entry->key & ~3UL);
}
#endif
@@ -172,12 +172,12 @@ static inline bool jump_entry_is_branch(const struct jump_entry *entry)
static inline bool jump_entry_is_init(const struct jump_entry *entry)
{
- return entry->code == 0;
+ return (unsigned long)entry->key & 2UL;
}
static inline void jump_entry_set_init(struct jump_entry *entry)
{
- entry->code = 0;
+ entry->key |= 2;
}
#endif
@@ -213,7 +213,6 @@ extern struct jump_entry __start___jump_table[];
extern struct jump_entry __stop___jump_table[];
extern void jump_label_init(void);
-extern void jump_label_invalidate_initmem(void);
extern void jump_label_lock(void);
extern void jump_label_unlock(void);
extern void arch_jump_label_transform(struct jump_entry *entry,
@@ -261,8 +260,6 @@ static __always_inline void jump_label_init(void)
static_key_initialized = true;
}
-static inline void jump_label_invalidate_initmem(void) {}
-
static __always_inline bool static_key_false(struct static_key *key)
{
if (unlikely(static_key_count(key) > 0))
diff --git a/init/main.c b/init/main.c
index 18f8f0140fa0..a664246450d1 100644
--- a/init/main.c
+++ b/init/main.c
@@ -1064,7 +1064,6 @@ static int __ref kernel_init(void *unused)
/* need to finish all async __init code before freeing the memory */
async_synchronize_full();
ftrace_free_init_mem();
- jump_label_invalidate_initmem();
free_initmem();
mark_readonly();
diff --git a/kernel/jump_label.c b/kernel/jump_label.c
index 898a1d0c38dc..e8cf3ff3149c 100644
--- a/kernel/jump_label.c
+++ b/kernel/jump_label.c
@@ -373,14 +373,15 @@ static enum jump_label_type jump_label_type(struct jump_entry *entry)
static void __jump_label_update(struct static_key *key,
struct jump_entry *entry,
- struct jump_entry *stop)
+ struct jump_entry *stop,
+ bool init)
{
for (; (entry < stop) && (jump_entry_key(entry) == key); entry++) {
/*
* An entry->code of 0 indicates an entry which has been
* disabled because it was in an init text area.
*/
- if (!jump_entry_is_init(entry)) {
+ if (init || !jump_entry_is_init(entry)) {
if (kernel_text_address(jump_entry_code(entry)))
arch_jump_label_transform(entry, jump_label_type(entry));
else
@@ -420,6 +421,9 @@ void __init jump_label_init(void)
if (jump_label_type(iter) == JUMP_LABEL_NOP)
arch_jump_label_transform_static(iter, JUMP_LABEL_NOP);
+ if (init_section_contains((void *)jump_entry_code(iter), 1))
+ jump_entry_set_init(iter);
+
iterk = jump_entry_key(iter);
if (iterk == key)
continue;
@@ -432,19 +436,6 @@ void __init jump_label_init(void)
cpus_read_unlock();
}
-/* Disable any jump label entries in __init/__exit code */
-void __init jump_label_invalidate_initmem(void)
-{
- struct jump_entry *iter_start = __start___jump_table;
- struct jump_entry *iter_stop = __stop___jump_table;
- struct jump_entry *iter;
-
- for (iter = iter_start; iter < iter_stop; iter++) {
- if (init_section_contains((void *)jump_entry_code(iter), 1))
- jump_entry_set_init(iter);
- }
-}
-
#ifdef CONFIG_MODULES
static enum jump_label_type jump_label_init_type(struct jump_entry *entry)
@@ -524,7 +515,8 @@ static void __jump_label_mod_update(struct static_key *key)
stop = __stop___jump_table;
else
stop = m->jump_entries + m->num_jump_entries;
- __jump_label_update(key, mod->entries, stop);
+ __jump_label_update(key, mod->entries, stop,
+ m->state == MODULE_STATE_COMING);
}
}
@@ -570,6 +562,9 @@ static int jump_label_add_module(struct module *mod)
for (iter = iter_start; iter < iter_stop; iter++) {
struct static_key *iterk;
+ if (within_module_init(jump_entry_code(iter), mod))
+ jump_entry_set_init(iter);
+
iterk = jump_entry_key(iter);
if (iterk == key)
continue;
@@ -605,7 +600,7 @@ static int jump_label_add_module(struct module *mod)
/* Only update if we've changed from our initial state */
if (jump_label_type(iter) != jump_label_init_type(iter))
- __jump_label_update(key, iter, iter_stop);
+ __jump_label_update(key, iter, iter_stop, true);
}
return 0;
@@ -661,19 +656,6 @@ static void jump_label_del_module(struct module *mod)
}
}
-/* Disable any jump label entries in module init code */
-static void jump_label_invalidate_module_init(struct module *mod)
-{
- struct jump_entry *iter_start = mod->jump_entries;
- struct jump_entry *iter_stop = iter_start + mod->num_jump_entries;
- struct jump_entry *iter;
-
- for (iter = iter_start; iter < iter_stop; iter++) {
- if (within_module_init(jump_entry_code(iter), mod))
- jump_entry_set_init(iter);
- }
-}
-
static int
jump_label_module_notify(struct notifier_block *self, unsigned long val,
void *data)
@@ -695,9 +677,6 @@ jump_label_module_notify(struct notifier_block *self, unsigned long val,
case MODULE_STATE_GOING:
jump_label_del_module(mod);
break;
- case MODULE_STATE_LIVE:
- jump_label_invalidate_module_init(mod);
- break;
}
jump_label_unlock();
@@ -767,7 +746,8 @@ static void jump_label_update(struct static_key *key)
entry = static_key_entries(key);
/* if there are no users, entry can be NULL */
if (entry)
- __jump_label_update(key, entry, stop);
+ __jump_label_update(key, entry, stop,
+ system_state < SYSTEM_RUNNING);
}
#ifdef CONFIG_STATIC_KEYS_SELFTEST
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-29 05:15:14 +0300