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authorArjan van de Ven <arjan@linux.intel.com>2008-08-15 15:29:38 -0700
committerIngo Molnar <mingo@elte.hu>2008-09-10 09:08:53 +0200
commitab7476cf76e560f0efda2a631a70aabe93009025 (patch)
treed4e843760774d7099692950a6ac49ccdbc8b0d55 /kernel/extable.c
parentfb822db465bd9fd4208eef1af4490539b236c54e (diff)
downloadlinaro-lsk-ab7476cf76e560f0efda2a631a70aabe93009025.tar.gz
debug: add notifier chain debugging, v2
- unbreak ia64 (and powerpc) where function pointers dont point at code but at data (reported by Tony Luck) [ mingo@elte.hu: various cleanups ] Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/extable.c')
-rw-r--r--kernel/extable.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/kernel/extable.c b/kernel/extable.c
index a26cb2e1702..adf0cc9c02d 100644
--- 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;
+}