x86/unwind: Show function name+offset in ORC error messages

x86/unwind: Show function name+offset in ORC error messages

Improve the warning messages to show the relevant function name+offset.
This makes it much easier to diagnose problems with the ORC metadata.

Before:

  WARNING: can't dereference iret registers at ffff8801c5f17fe0 for ip ffffffff95f0d94b

After:

  WARNING: can't dereference iret registers at ffff880178f5ffe0 for ip int3+0x5b/0x60

Reported-by: Andrei Vagin <[email protected]>
Signed-off-by: Josh Poimboeuf <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Fixes: ee9f8fce9964 ("x86/unwind: Add the ORC unwinder")
Link: http://lkml.kernel.org/r/6bada6b9eac86017e16bd79e1e77877935cb50bb.1508516398.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <[email protected]>