From: Andrew Morton <akpm@linux-foundation.org>
To: Anthony Yznaga <anthony.yznaga@oracle.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-kselftest@vger.kernel.org, david@kernel.org,
ljs@kernel.org, Liam.Howlett@oracle.com, vbabka@kernel.org,
rppt@kernel.org, surenb@google.com, mhocko@suse.com,
jannh@google.com, pfalcato@suse.de, Jason@zx2c4.com,
shuah@kernel.org, Mark Brown <broonie@kernel.org>
Subject: Re: [PATCH v2 0/2] fix MAP_DROPPABLE not supported errno
Date: Fri, 3 Apr 2026 10:37:15 -0700 [thread overview]
Message-ID: <20260403103715.0f61fa1d0991a90d85bedaf5@linux-foundation.org> (raw)
In-Reply-To: <20260402235933.10588-1-anthony.yznaga@oracle.com>
On Thu, 2 Apr 2026 16:59:31 -0700 Anthony Yznaga <anthony.yznaga@oracle.com> wrote:
> Mark Brown reported seeing a regression in -next on 32 bit arm with the
> mlock selftests. Before exiting and marking the tests failed, the following
> message was logged after an attempt to create a MAP_DROPPABLE mapping:
>
> Bail out! mmap error: Unknown error 524
>
> It turns out error 524 is ENOTSUPP which is an error that userspace is not
> supposed to see, but it indicates in this instance that MAP_DROPPABLE is
> not supported.
>
> The first patch changes the errno returned to EOPNOTSUPP. The second patch
> is a second version of a prior patch to introduce selftests to verify
> locking behavior with droppable mappings with the additonal change to skip
> the tests when MAP_DROPPABLE is not supported.
Thanks, I updated mm.git's mm-unstable branch to this version.
In [1/2] I added Mark's Reported.by:. We had David's Acked-by: on v1's
[1/2] patch so I reinstated that.
prev parent reply other threads:[~2026-04-03 17:37 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-02 23:59 Anthony Yznaga
2026-04-02 23:59 ` [PATCH v2 1/2] mm: fix mmap errno value when MAP_DROPPABLE is not supported Anthony Yznaga
2026-04-03 18:16 ` Vlastimil Babka (SUSE)
2026-04-06 8:35 ` Pedro Falcato
2026-04-07 10:05 ` Lorenzo Stoakes (Oracle)
2026-04-02 23:59 ` [PATCH v2 2/2] selftests/mm: verify droppable mappings cannot be locked Anthony Yznaga
2026-04-03 19:31 ` Andrew Morton
2026-04-08 20:35 ` anthony.yznaga
2026-04-08 21:02 ` Andrew Morton
2026-04-08 22:26 ` anthony.yznaga
2026-04-03 17:37 ` Andrew Morton [this message]
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