[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>
diff --git a/include/linux/module.h b/include/linux/module.h
index 9e9dc7c..d06c74f 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -358,6 +358,7 @@
/* 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 is_module_address(unsigned long addr);
/* Returns module and fills in value, defined and namebuf, or NULL if
symnum out of range. */
@@ -496,6 +497,11 @@
return NULL;
}
+static inline int is_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)
diff --git a/kernel/module.c b/kernel/module.c
index 281172f..0351625 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2159,6 +2159,29 @@
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)
{