KGDB/KDB regression fixes

   3.4: Fix an an Smatch warning that appeared in the 3.4 merge window
   3.0: Fix kgdb test suite with SMP for all archs without HW single stepping
2.6.36: Fix kgdb sw breakpoints with CONFIG_DEBUG_RODATA=y limitations on x86
2.6.26: Fix oops on kgdb test suite with CONFIG_DEBUG_RODATA
        Fix kgdb test suite with SMP for all archs with HW single stepping
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