What compiler are you using - for me it builds clean here ! -Vineet On Monday 08 February 2016 07:07 PM, David Binderman wrote: > Hello there, > > [linux-4.5-rc3/arch/arc/kernel/unwind.c:629]: (warning) Invalid test for overflow 'ptr+len<ptr'. Condition is always false unless there is overflow, and overflow is Undefined Behaviour. > > Source code is > > if (ptr + len < ptr || ptr + len> end) > return -1; > > Suggest code rework. > > > Regards > > David Binderman > >