mod_find() uses either the modules list to find a module or a tree
lookup (CONFIG_MODULES_TREE_LOOKUP). The list and the tree can both be
iterated under RCU assumption (as well as RCU-sched).
Remove module_assert_mutex_or_preempt() from __module_address() and
entirely since __module_address() is the last user.
Update comments.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
---
kernel/module/internal.h | 11 -----------
kernel/module/main.c | 4 +---
2 files changed, 1 insertion(+), 14 deletions(-)
diff --git a/kernel/module/internal.h b/kernel/module/internal.h
index daef2be839022..030d2ed175fa8 100644
--- a/kernel/module/internal.h
+++ b/kernel/module/internal.h
@@ -122,17 +122,6 @@ char *module_next_tag_pair(char *string, unsigned long *secsize);
#define for_each_modinfo_entry(entry, info, name) \
for (entry = get_modinfo(info, name); entry; entry = get_next_modinfo(info, name, entry))
-static inline void module_assert_mutex_or_preempt(void)
-{
-#ifdef CONFIG_LOCKDEP
- if (unlikely(!debug_locks))
- return;
-
- WARN_ON_ONCE(!rcu_read_lock_sched_held() &&
- !lockdep_is_held(&module_mutex));
-#endif
-}
-
static inline unsigned long kernel_symbol_value(const struct kernel_symbol *sym)
{
#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
diff --git a/kernel/module/main.c b/kernel/module/main.c
index 126f7f05dedf8..686b74c7c17f5 100644
--- a/kernel/module/main.c
+++ b/kernel/module/main.c
@@ -3667,7 +3667,7 @@ bool is_module_address(unsigned long addr)
* __module_address() - get the module which contains an address.
* @addr: the address.
*
- * Must be called with preempt disabled or module mutex held so that
+ * Must be called within RCU read section or module mutex held so that
* module doesn't get freed during this.
*/
struct module *__module_address(unsigned long addr)
@@ -3685,8 +3685,6 @@ struct module *__module_address(unsigned long addr)
return NULL;
lookup:
- module_assert_mutex_or_preempt();
-
mod = mod_find(addr, &mod_tree);
if (mod) {
BUG_ON(!within_module(addr, mod));
--
2.45.2
