On Tue, Mar 31, 2026 at 07:00:07AM -0600, Keith Busch wrote: > On Tue, Mar 31, 2026 at 11:37:58AM +0300, Leon Romanovsky wrote: > > On Thu, Mar 26, 2026 at 04:41:11PM -0600, Keith Busch wrote: > > > > > > You're suggesting that Ziping append the new fields to the end of this > > > struct? I don't think we can modify the layout of a uapi. > > > > He needs to add before flex array. This struct is submitted by the user > > and kernel can easily calculate the position of that array. > > No, you can't just do that. Existing applications would break when they > compile against the updated kernel header. They don't know about this > new "tph" supplied flag, but they'll all accidently use the new > dma_ranges offset.
So we need to always pass TPH flag and treat 0 as do-nothing-field. Thanks
