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b=gXIXNSNMmkoVNor9lok/efYhi7AraY/lYzc+w0MPepa2npDYVjVfV8csr2TCIpBNv ThjAsNgNiorsLVCRlHHDsuw8K29CLmiv0sUibMV/QXcEEd0zDdYklj3Ia+z9xrqBa4 ebjQqsweArLhapmphHovf+Za9Br/fDeMRTOyH6hw= Date: Tue, 31 Mar 2026 14:17:14 -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: <20260331141714.b2f4e41b494060e55610a5f3@linux-foundation.org> In-Reply-To: <52bec9ea-5627-4ea2-8f27-f1729957fa47@sirena.org.uk> References: <20260310155821.17869-1-anthony.yznaga@oracle.com> <20260310155821.17869-2-anthony.yznaga@oracle.com> <52bec9ea-5627-4ea2-8f27-f1729957fa47@sirena.org.uk> 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-Rspamd-Queue-Id: D994C14000A X-Stat-Signature: hc8ymp6ikkdq11zqor7gh1bxierukec3 X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1774991836-955184 X-HE-Meta: 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 RqtgvGKK 7d3ddAmiUDfrPe0ieqVAGLkcLXG2ARL8LpnSj8ft5R3WNTzuC6ZixpExiZB8XH4qVK29UJE2QwAEcDpLc3IiGqi24bRGoz7g1QH7oBRZVqCtMoQ4CgsoIOD3B/9eJ3IpN48j15cPpFyPIpGSo+vznqE2nPh/aOvDVka27L14i1ZIFKWc/fe+FEw0A6aRSQXFoYpbSwM8X5qBM3SrfrcgbntKT1D+LAe89h9PKnjLeWJ4cHw8SIxXSbY5tGoJXnznFxOpA61sgY9cJy6EGf3ZkHMY0fi0AdZWQoZLCJhT1cPBswPSLdbv937ONZi8x6zzcCBFZ Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, 31 Mar 2026 14:17:50 +0100 Mark Brown wrote: > On Tue, Mar 10, 2026 at 08:58:21AM -0700, Anthony Yznaga wrote: > > > Verify that a mapping created with MAP_DROPPABLE cannot be locked > > via mlock(), and that it will not be locked if it's created after > > mlockall(MCL_FUTURE). > > I'm seeing a regression in -next on 32 bit arm which bisects to this > patch: Cool, thanks. > ... > > 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")? 5435ba164b0d is presently in mm-stable, cc:stable@vger.kernel.org.