[PATCH] lockdep: add is_module_address()

Add is_module_address() method - to be used by lockdep.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/kernel/module.c b/kernel/module.c
index 281172f01e9a..0351625767b1 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2159,6 +2159,29 @@ const struct exception_table_entry *search_module_extables(unsigned long addr)
         return e;
 }
 
+/*
+ * Is this a valid module address?
+ */
+int is_module_address(unsigned long addr)
+{
+        unsigned long flags;
+        struct module *mod;
+
+        spin_lock_irqsave(&modlist_lock, flags);
+
+        list_for_each_entry(mod, &modules, list) {
+                if (within(addr, mod->module_core, mod->core_size)) {
+                        spin_unlock_irqrestore(&modlist_lock, flags);
+                        return 1;
+                }
+        }
+
+        spin_unlock_irqrestore(&modlist_lock, flags);
+
+        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)
 {