On Tue, Jun 24, 2014 at 07:27:15PM +0530, Varun Sethi wrote: > /* window size is 2^(WSE+1) bytes */ > - return __ffs(addrspace_size) - 1; > + return fls64(addrspace_size) - 2; This looks bogus, why do you replace ffs (find-first-bit) by fls (find-last-bit)? Joerg