On 24/03/2017 19:22, Marc Zyngier wrote: > You cannot directly use a pointer to a u32 in any of the bitmap > operations. You need to copy the value to an unsigned long, and > apply the bitmap op on that. On my platform, find_first_zero_bit() resolves to int _find_first_zero_bit_le(const void * p, unsigned size); If the underlying implementation actually expects an unsigned long pointer, should the function prototype be changed? Regards.