1 files changed, 16 insertions, 0 deletions

diff --git a/kernel/extable.c b/kernel/extable.c
index feb0317cf09a..e136ed8d82ba 100644
--- a/kernel/extable.c
+++ b/kernel/extable.c
@@ -67,3 +67,19 @@ 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;
+}