From: Balbir Singh <balbirs@nvidia.com>
To: Aboorva Devarajan <aboorvad@linux.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, Jason Gunthorpe <jgg@ziepe.ca>,
Leon Romanovsky <leon@kernel.org>,
David Hildenbrand <david@kernel.org>,
Lorenzo Stoakes <ljs@kernel.org>,
"Liam R . Howlett" <liam@infradead.org>,
Vlastimil Babka <vbabka@kernel.org>,
Mike Rapoport <rppt@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>, Shuah Khan <shuah@kernel.org>,
Ralph Campbell <rcampbell@nvidia.com>,
Matthew Brost <matthew.brost@intel.com>,
Alistair Popple <apopple@nvidia.com>,
Alex Sierra <alex.sierra@amd.com>,
Matthew Wilcox <willy@infradead.org>,
Sayali Patil <sayalip@linux.ibm.com>,
linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 1/3] selftests/mm: allow PUD-level entries in compound testcase of hmm tests
Date: Mon, 15 Jun 2026 10:16:41 +1000 [thread overview]
Message-ID: <aivB1jLODH1W_0yt@parvat> (raw)
In-Reply-To: <20260611034102.1030738-2-aboorvad@linux.ibm.com>
On Thu, Jun 11, 2026 at 09:11:00AM +0530, Aboorva Devarajan wrote:
> From: Sayali Patil <sayalip@linux.ibm.com>
>
> The HMM compound testcase currently assumes only PMD-level mappings and
> fails on systems where default_hugepagesz=1G is set, because the region
> is then reported by the device at PUD level.
>
> Determine the mapping level (PMD or PUD) the device reports for the first
> page of the range and require every page to match that level exactly via
> ASSERT_EQ(). This accepts PUD-level mappings while preserving the
> expected/observed protection values printed on failure, and rejects a
> fragmented mapping that mixes PMD- and PUD-level entries within the same
> range (which a per-page OR check would have let pass).
>
PUD is not supported with zone device private folios, the fix should
be really around default_huge_page_size(), using the default pmd size.
Balbir
next prev parent reply other threads:[~2026-06-15 0:16 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-11 3:40 [PATCH v3 0/3] selftests/mm: assorted fixes for hmm-tests Aboorva Devarajan
2026-06-11 3:41 ` [PATCH v3 1/3] selftests/mm: allow PUD-level entries in compound testcase of hmm tests Aboorva Devarajan
2026-06-15 0:16 ` Balbir Singh [this message]
2026-06-24 3:34 ` Aboorva Devarajan
2026-06-11 3:41 ` [PATCH v3 2/3] selftests/mm: remove hardcoded THP sizing assumptions in " Aboorva Devarajan
2026-06-12 8:22 ` Balbir Singh
2026-06-11 3:41 ` [PATCH v3 3/3] selftests/mm: fix exclusive_cow test fork() handling Aboorva Devarajan
2026-06-11 4:59 ` Balbir Singh
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