Add div64_s64_rem() function, with 32-bit implementation that uses
div64_u64_rem() and a branchless approach to resolve the sign of the
remainder and quotient (negation in two's complement).
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Rodrigo Alencar <rodrigo.alencar@analog.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>