[patch 06/61] lock validator: add __module_address() method

[Ingo Molnar]

From: Ingo Molnar <mingo@xxxxxxx>

add __module_address() method - to be used by lockdep.

Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
---
 include/linux/module.h |    6 ++++++
 kernel/module.c        |   14 ++++++++++++++
 2 files changed, 20 insertions(+)

Index: linux/include/linux/module.h
===================================================================
--- linux.orig/include/linux/module.h
+++ linux/include/linux/module.h
@@ -371,6 +371,7 @@ static inline int module_is_live(struct 
 /* Is this address in a module? (second is with no locks, for oops) */
 struct module *module_text_address(unsigned long addr);
 struct module *__module_text_address(unsigned long addr);
+int __module_address(unsigned long addr);
 
 /* Returns module and fills in value, defined and namebuf, or NULL if
    symnum out of range. */
@@ -509,6 +510,11 @@ static inline struct module *__module_te
 	return NULL;
 }
 
+static inline int __module_address(unsigned long addr)
+{
+	return 0;
+}
+
 /* Get/put a kernel symbol (calls should be symmetric) */
 #define symbol_get(x) ({ extern typeof(x) x __attribute__((weak)); &(x); })
 #define symbol_put(x) do { } while(0)
Index: linux/kernel/module.c
===================================================================
--- linux.orig/kernel/module.c
+++ linux/kernel/module.c
@@ -2222,6 +2222,20 @@ const struct exception_table_entry *sear
 	return e;
 }
 
+/*
+ * Is this a valid module address? We don't grab the lock.
+ */
+int __module_address(unsigned long addr)
+{
+	struct module *mod;
+
+	list_for_each_entry(mod, &modules, list)
+		if (within(addr, mod->module_core, mod->core_size))
+			return 1;
+	return 0;
+}
+
+
 /* Is this a valid kernel address?  We don't grab the lock: we are oopsing. */
 struct module *__module_text_address(unsigned long addr)
 {
-
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