From: Andrew Morton <akpm@linux-foundation.org>
To: Foxie Flakey <foxieflakey@gmail.com>,
rppt@kernel.org, peterx@redhat.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] userfaultfd: reset err to be 0 when move_pages_ptes succeeded
Date: Mon, 17 Aug 2026 15:35:01 -0700 [thread overview]
Message-ID: <20260817153501.ee2ee77976e1cd5b1e1c813b@linux-foundation.org> (raw)
In-Reply-To: <20260817152605.5d2bee3fbf1a2bace4c0eff1@linux-foundation.org>
On Mon, 17 Aug 2026 15:26:05 -0700 Andrew Morton <akpm@linux-foundation.org> 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?
next prev parent reply other threads:[~2026-08-17 22:35 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-15 10:42 [PATCH] userfaultfd: reset err to be 0 when move_pages_ptes succeeded Foxie Flakey
2026-08-16 9:15 ` Mike Rapoport
2026-08-16 9:41 ` Foxie Flakey
2026-08-16 11:45 ` Mike Rapoport
2026-08-16 13:58 ` Foxie Flakey
2026-08-16 15:43 ` Suren Baghdasaryan
2026-08-16 15:58 ` Foxie Flakey
2026-08-17 22:26 ` Andrew Morton
2026-08-17 22:35 ` Andrew Morton [this message]
2026-08-18 1:29 ` Foxie Flakey
2026-08-18 1:13 ` Foxie Flakey
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