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Sun, 01 Feb 2026 16:55:35 -0800 (PST) From: Usama Arif To: ziy@nvidia.com, Andrew Morton , David Hildenbrand , lorenzo.stoakes@oracle.com, linux-mm@kvack.org Cc: hannes@cmpxchg.org, riel@surriel.com, shakeel.butt@linux.dev, kas@kernel.org, baohua@kernel.org, dev.jain@arm.com, baolin.wang@linux.alibaba.com, npache@redhat.com, Liam.Howlett@oracle.com, ryan.roberts@arm.com, vbabka@suse.cz, lance.yang@linux.dev, linux-kernel@vger.kernel.org, kernel-team@meta.com, Usama Arif Subject: [RFC 07/12] selftests/mm: add PUD THP read/write access test Date: Sun, 1 Feb 2026 16:50:24 -0800 Message-ID: <20260202005451.774496-8-usamaarif642@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260202005451.774496-1-usamaarif642@gmail.com> References: <20260202005451.774496-1-usamaarif642@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add a test that verifies data integrity across a 1GB PUD THP region by writing patterns at page boundaries and reading them back. Signed-off-by: Usama Arif --- tools/testing/selftests/mm/pud_thp_test.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/tools/testing/selftests/mm/pud_thp_test.c b/tools/testing/self= tests/mm/pud_thp_test.c index 6f0c02c6afd3a..7a1f0b0f81468 100644 --- a/tools/testing/selftests/mm/pud_thp_test.c +++ b/tools/testing/selftests/mm/pud_thp_test.c @@ -158,4 +158,27 @@ TEST_F(pud_thp, basic_allocation) self->mthp_alloc_before, mthp_alloc_after); } =20 +/* + * Test: Read/write access patterns + * Verifies data integrity across the entire 1GB region + */ +TEST_F(pud_thp, read_write_access) +{ + unsigned long *ptr =3D (unsigned long *)self->aligned; + size_t i; + int errors =3D 0; + + /* Write pattern - sample every page to reduce test time */ + for (i =3D 0; i < PUD_SIZE / sizeof(unsigned long); i +=3D PAGE_SIZE / si= zeof(unsigned long)) + ptr[i] =3D i ^ 0xDEADBEEFUL; + + /* Verify pattern */ + for (i =3D 0; i < PUD_SIZE / sizeof(unsigned long); i +=3D PAGE_SIZE / si= zeof(unsigned long)) { + if (ptr[i] !=3D (i ^ 0xDEADBEEFUL)) + errors++; + } + + ASSERT_EQ(errors, 0); +} + TEST_HARNESS_MAIN --=20 2.47.3