> From: Stefan Hajnoczi <stefanha@xxxxxxxxxx> > Sent: Wednesday, August 30, 2023 2:27 AM > > u64 alignment behaves differently depending on the architecture and so > <uapi/linux/types.h> offers __aligned_u64 to achieve consistent behavior > in kernel<->userspace ABIs. > > There are structs in <uapi/linux/vfio.h> that can trivially be updated > to __aligned_u64 because the struct sizes are multiples of 8 bytes. > There is no change in memory layout on any CPU architecture and > therefore this change is safe. > > The commits that follow this one handle the trickier cases where > explanation about ABI breakage is necessary. > > Suggested-by: Jason Gunthorpe <jgg@xxxxxxxxxx> > Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx> > Signed-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx> Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
