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b=Uws9wjJE8a6LUlC1K75cOrahSIa88MlVL/cOcGuUfmc1fIrG9KUDszDZkHNbCl0c5 7fg+sHAYKj2SjgOTbgnX0K9/5vfXssNMrRMlEuipz5giV8UMy0BiZsnKd9TrQ7yX2U 0FS7eKqnC8rVi0MtpnmgZSNg+gx/mfFft9Y/l++c= Date: Wed, 1 Apr 2026 13:27:21 -0700 From: Andrew Morton To: Mark Brown Cc: Anthony Yznaga , 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 Subject: Re: [PATCH v2 2/2] selftests/mm: verify droppable mappings cannot be locked Message-Id: <20260401132721.ef6c976eeb5e50b0cf6bb635@linux-foundation.org> In-Reply-To: References: <20260310155821.17869-1-anthony.yznaga@oracle.com> <20260310155821.17869-2-anthony.yznaga@oracle.com> <52bec9ea-5627-4ea2-8f27-f1729957fa47@sirena.org.uk> <20260331141714.b2f4e41b494060e55610a5f3@linux-foundation.org> X-Mailer: Sylpheed 3.7.0 (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-Rspamd-Queue-Id: 3D4CB20009 X-Stat-Signature: wudbzbuh9fqut5t65ubszzxc8xp6fyfr X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1775075244-481395 X-HE-Meta: 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 DcM9ye/c HTAyyMQ4BY+NcTbdmndx0M6YZf00f/vGH1ZpPSsbnhi+ee4kyesaHAtvFQYRGhA+qotprzdz2DDF7Ft5XRWDKP1DHTkUx5QAkIGmu6C5GF+PG3AZqm7qsR8uTWOIkqjPKIH4i+X/arzOOMKLl5xt1NUwv7cJORi0aFKqOsVRHPfRHkSHdxmr881FDf3VFvILTvtnoqlmv7rLOx6BI8Oszn47Kn04ZGbW/eh6RAfu1Q6wt8nJ6ecnwSBdOGMRcXBmNAy2E/l9KKe4FKOP35yeO15jKGpdqaInigT0E3Mq33X7f7esFp8qFhWlfckNqGV81dBUKoBV4DHH/H7s= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, 1 Apr 2026 12:17:30 +0100 Mark Brown wrote: > On Tue, Mar 31, 2026 at 02:17:14PM -0700, Andrew Morton wrote: > > On Tue, 31 Mar 2026 14:17:50 +0100 Mark Brown wrote: > > > > All these failures which cause the entire test program to immediately > > > die seem exceessively strong... > > > Well, is the test code incorrect, or is the patch which it's testing > > incorrect? That's 5435ba164b0d ("mm: prevent droppable mappings from > > being locked")? > > I've done no investigation on the actual failure, sorry - the comment > above is a stylistic/usability one about the test program. Thanks. Anthony believes this is a problem in the test code, not in the kernel code which is being tested. He's working on the test code so I shall drop the current test code from mm.git't mm-stable tree. That's 6235dbcce97f ("selftests/mm: verify droppable mappings cannot be locked")