Re: [PATCH] userfaultfd: reset err to be 0 when move_pages_ptes succeeded
Andrew Morton <[email protected]>
| Newsgroups | org.kvack.linux-mm,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <[email protected]> |
On Mon, 17 Aug 2026 15:26:05 -0700 Andrew Morton <[email protected]> wrote: > > That behaviour manifested into this at userspace > > > > Source: [ .. unmapped .. ][ .. mapped ..] > > Destination: [ .. mapped .. ][ .. unmapped ..] > > ^ ^ > > \ Kernel moved this far in actuality > > What is reported to userspace on struct > > uffdio_move's move field > > > > When the previous behaviour is > > Source: [ .. unmapped .. ][ .. mapped ..] > > Destination: [ .. mapped .. ][ .. unmapped ..] > > ^ > > Reported to user space via uffdio_move's > > move field Also... I assume the above illuminates lack of coverage in the uffd selftests. Is it hard to add a case to detect this?