Re: [Question] Missing data after DMA read transfer

[One Thousand Gnomes]

> 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