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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> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 9860918000D X-Stat-Signature: 4habpxy4n4rkwsyk4skgipho4t5nbcq1 X-Rspam-User: X-HE-Tag: 1769993737-771449 X-HE-Meta: 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 N3EnB8oN 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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/selftests/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); } +/* + * Test: Read/write access patterns + * Verifies data integrity across the entire 1GB region + */ +TEST_F(pud_thp, read_write_access) +{ + unsigned long *ptr = (unsigned long *)self->aligned; + size_t i; + int errors = 0; + + /* Write pattern - sample every page to reduce test time */ + for (i = 0; i < PUD_SIZE / sizeof(unsigned long); i += PAGE_SIZE / sizeof(unsigned long)) + ptr[i] = i ^ 0xDEADBEEFUL; + + /* Verify pattern */ + for (i = 0; i < PUD_SIZE / sizeof(unsigned long); i += PAGE_SIZE / sizeof(unsigned long)) { + if (ptr[i] != (i ^ 0xDEADBEEFUL)) + errors++; + } + + ASSERT_EQ(errors, 0); +} + TEST_HARNESS_MAIN -- 2.47.3