[PATCH 1/2] Add for_each_module iterator function v2

[Andi Kleen <andi@firstfloor.org>]

From: Andi Kleen <ak@linux.intel.com>

This is a generic function to iterate over all modules.
To be used in the next patch.

v2: Use module_mutex instead of preempt disabling

Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 include/linux/module.h |    1 +
 kernel/module.c        |   10 ++++++++++
 2 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/include/linux/module.h b/include/linux/module.h
index 403ac26..809b6db 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -410,6 +410,7 @@ struct module *__module_address(unsigned long addr);
 bool is_module_address(unsigned long addr);
 bool is_module_percpu_address(unsigned long addr);
 bool is_module_text_address(unsigned long addr);
+void for_each_module(void (*op)(struct module *, void *arg), void *arg);
 
 static inline int within_module_core(unsigned long addr, struct module *mod)
 {
diff --git a/kernel/module.c b/kernel/module.c
index eba1341..9e2a561 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -384,6 +384,16 @@ struct module *find_module(const char *name)
 }
 EXPORT_SYMBOL_GPL(find_module);
 
+void for_each_module(void (*op)(struct module *, void *arg), void *arg)
+{
+	struct module *mod;
+
+	mutex_lock(&module_mutex);
+	list_for_each_entry_rcu(mod, &modules, list)
+		op(mod, arg);
+	mutex_unlock(&module_mutex);
+}
+
 #ifdef CONFIG_SMP
 
 static inline void __percpu *mod_percpu(struct module *mod)
-- 
1.7.1