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b=y5uKcWX8kD48kqz0cp/5ZVIWIwf5/lCY5Yp+T4vXaP15g2yMe9Vj3qPLTqkUoyvV2 XiLcCOnVhZT6oCoXdQncRVCdxKx7QqFb+7xqG2PSIvdEQm9F0M7d7IJFu1gCZczzth gxVOv1zcI6j6rUJeawSxa5WCeXllxWeYr8clXsPE= Date: Fri, 3 Apr 2026 10:37:15 -0700 From: Andrew Morton To: Anthony Yznaga 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 Subject: Re: [PATCH v2 0/2] fix MAP_DROPPABLE not supported errno Message-Id: <20260403103715.0f61fa1d0991a90d85bedaf5@linux-foundation.org> In-Reply-To: <20260402235933.10588-1-anthony.yznaga@oracle.com> References: <20260402235933.10588-1-anthony.yznaga@oracle.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Stat-Signature: aspm9umrd7zdmet754ygpqqwtqoq6ca8 X-Rspamd-Queue-Id: 1103CC0009 X-Rspam-User: X-Rspamd-Server: rspam03 X-HE-Tag: 1775237837-204282 X-HE-Meta: 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 0nrS2oOT Mc1xeUAthDZ6ueYrF1psA8qZeNMk0DqPiGZotJvYJmz1g5WTrAC9NjLRE/VaqRLogZAmVV8kBlYm5Rg/FrChytta8DnOwMd5cnM0/MU75OtCkuLLTNRO+/Y9VqtmhdoFaByucLwA5hIoKH8q+pXiVbNjtY6UGZE4+a5lYqdwG+3lpKbkvQj2PywCzg48afli7SN5gBkBLCoN5rqqx4PStEhZ2cmqqTUuq1ppbO+8VLBNXEgCDtayVf3NPCfx6sguHVFeFEoGiSy1MYfT2Ew924BDR5vED72BExnQtx1CO0NxEBFOYOmt43sQDpkjvXraEXbW5ZY5Mhe2G+gbsUXRZhx5tPXbziZ7T9EqfFq/zd1tB70QMmB0KIyM71A== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, 2 Apr 2026 16:59:31 -0700 Anthony Yznaga 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.