From: Guohua Zhong > Sent: 24 August 2020 14:26 > > >> >In generic version in lib/math/div64.c, there is no checking of 'base' > >> >either. > >> >Do we really want to add this check in the powerpc version only ? > >> > >> >The only user of __div64_32() is do_div() in > >> >include/asm-generic/div64.h. Wouldn't it be better to do the check there ? > >> > >> >Christophe > >> > >> Yet, I have noticed that there is no checking of 'base' in these functions. > >> But I am not sure how to check is better.As we know that the result is > >> undefined when divisor is zero. It maybe good to print error and dump > >> stack.
I thought that the onus was put on the caller to avoid divide by zero. On x86 divide by zero causes an exception which (I'm pretty sure) leads to a oops/panic. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)