> But if I try to copy_from_user (using the address coming from userland, the > one passed to get_user_pages), the data has not been written and I see the > memset value. > > I manage to build a test case that fails all the time, but never at the same > offset within the buffer. > It's always in the middle (never at the start nor end), for a few pages long > (varies between runs).
Always page aligned, always cache line aligned or arbitrarily aligned ? Alan
