debug: add notifier chain debugging, v2

[linux-2.6-block.git] / kernel / extable.c

diff --git a/kernel/extable.c b/kernel/extable.c
index a26cb2e170237d849c9f87038a6def48ee948dd6..adf0cc9c02d6873d50c48edf4c34b44a32bf48b9 100644 (file)
--- a/kernel/extable.c
+++ b/kernel/extable.c
@@ -66,3 +66,19 @@ int kernel_text_address(unsigned long addr)
                return 1;
        return module_text_address(addr) != NULL;
 }
+
+/*
+ * On some architectures (PPC64, IA64) function pointers
+ * are actually only tokens to some data that then holds the
+ * real function address. As a result, to find if a function
+ * pointer is part of the kernel text, we need to do some
+ * special dereferencing first.
+ */
+int func_ptr_is_kernel_text(void *ptr)
+{
+       unsigned long addr;
+       addr = (unsigned long) dereference_function_descriptor(ptr);
+       if (core_kernel_text(addr))
+               return 1;
+       return module_text_address(addr) != NULL;
+}