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b=BwBMXooHh/FNWX+eVvSFWRbzYe6GxMeInSjLfY6+Uh9LrW8QyR6o6r0+nH+La9maz b4H+drJ6+Gacit9buekB7BqVmjK0WJWa7BwKTcv7DOFGdtVXy8KSOZdZNjfMHdgOMB jgsKImFGNu+YneeknvNigWDwqdNFh/vSUHU/NFhc= Date: Fri, 11 Sep 2026 21:25:03 -0700 From: Andrew Morton To: Gregory Price Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@meta.com, liam@infradead.org, ljs@kernel.org, david@kernel.org, vbabka@kernel.org, jannh@google.com, ziy@nvidia.com, matthew.brost@intel.com, joshua.hahnjy@gmail.com, rakie.kim@sk.com, byungchul@sk.com, ying.huang@linux.alibaba.com, apopple@nvidia.com, peterx@redhat.com, jgg@ziepe.ca, sashiko-bot Subject: Re: [PATCH v2 0/2] mm: stop calling pmd_folio() on special PMDs Message-Id: <20260911212503.bcf8461db17ebbf51233826a@linux-foundation.org> In-Reply-To: <20260912034833.2952750-1-gourry@gourry.net> References: <20260912034833.2952750-1-gourry@gourry.net> 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-Server: rspam02 X-Rspamd-Queue-Id: D550B180002 X-Stat-Signature: tg5m1wocrcq6rhwu3bxx4y9uwyubjfih X-Rspam-User: X-HE-Tag: 1789187105-145551 X-HE-Meta: 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 a/bRgCj+ brw4CmSLGn7bkM49+t3F8pKUyMyAEjvhVwohKiuJOOaGS3pextGfvVA68lE18Pe92TVOpRpZKvQkH4YqxII5p6zNYUR8Q1D3v8Gy6MX0AA4uwJ/i1hYgX3ptv0j/l7SR/OFupqoO6oS/yCP0TAQNrFgHt9Adu9RAQGF7rAiM2KZE8Xv0dIUK5n4X6yhAJXoB4vO2HldtVrtxjT1qLGOeEh4ywF/0OUJgW2flG2mhXMFq+Q1XbRIh++18gzj1FiIL1B/GetEfq2GyAhTZUWfNThYIdOgZBqyp2L52Et5ddjY5LZe+QsJFcodE/KJfHkFH68mxUymqIBX3zvcCKykSs+r50AJRUGUjE9MiQH4w2mzdPpFsbYbjGskVN5tUUw/tCJwlRpnrRyQ5lo7jN72cJZFRbEovN9/yn3toYK9JO5afrh5l0GTuau/6Zhg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, 11 Sep 2026 23:48:31 -0400 Gregory Price wrote: > Reproducer > ========== > > No hardware needed. An out of tree module stands in for the drivers above: > three misc devices, each with a ->huge_fault calling vmf_insert_pfn_pmd(), > plus VM_HUGEPAGE so the fault path takes the PMD branch. I take it there's no known way of triggering this in current mainline?