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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1774577777; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=+u28b+kGwOwWeo4iPTn5u1dAfo4aLeElFP2cFybYpB4=; b=nFrkNXxvndBSqppjWyV9ntkfxnDZ0DtuCQnUOY5sup4Cn3dvGfyt7wUKnT4xAdfcGQUu19 prxL9x0QtRJ7eGgfh7QoH8qmgtTOcQ/tFTBltl+w+k5V6XIa5MkQdNn/z6ZBfUXndUQ60X oH4UtoxyWYliZvg4O6754ph/DAJrixE= From: Usama Arif To: Andrew Morton , david@kernel.org, Lorenzo Stoakes , willy@infradead.org, linux-mm@kvack.org Cc: fvdl@google.com, 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, Vlastimil Babka , lance.yang@linux.dev, linux-kernel@vger.kernel.org, kernel-team@meta.com, maddy@linux.ibm.com, mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, borntraeger@linux.ibm.com, svens@linux.ibm.com, linux-s390@vger.kernel.org, Usama Arif Subject: [v3 22/24] selftests/mm: add partial_mlock test Date: Thu, 26 Mar 2026 19:09:04 -0700 Message-ID: <20260327021403.214713-23-usama.arif@linux.dev> In-Reply-To: <20260327021403.214713-1-usama.arif@linux.dev> References: <20260327021403.214713-1-usama.arif@linux.dev> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT Add test for partial mlock on THP which exercises walk_page_range() with a subset of the THP. This should trigger a PMD split since mlock operates at page granularity. Signed-off-by: Usama Arif --- .../testing/selftests/mm/thp_pmd_split_test.c | 26 +++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/tools/testing/selftests/mm/thp_pmd_split_test.c b/tools/testing/selftests/mm/thp_pmd_split_test.c index 4944a5a516da9..3c9f05457efec 100644 --- a/tools/testing/selftests/mm/thp_pmd_split_test.c +++ b/tools/testing/selftests/mm/thp_pmd_split_test.c @@ -177,4 +177,30 @@ TEST_F(thp_pmd_split, partial_mprotect) self->split_pmd_failed_before); } +/* + * Partial mlock triggering split (walk_page_range) + * + * Tests mlock on a partial THP region which should trigger a PMD split. + */ +TEST_F(thp_pmd_split, partial_mlock) +{ + int ret; + + ret = allocate_thp(self->aligned, self->pmdsize); + if (ret) + SKIP(return, "Failed to allocate THP"); + + /* Partial mlock - should trigger PMD split */ + ret = mlock((char *)self->aligned + self->pagesize, self->pagesize); + if (ret && errno == ENOMEM) + SKIP(return, "mlock failed with ENOMEM (resource limit)"); + ASSERT_EQ(ret, 0); + + /* Cleanup */ + munlock((char *)self->aligned + self->pagesize, self->pagesize); + + log_and_check_pmd_split(_metadata, self->split_pmd_before, + self->split_pmd_failed_before); +} + TEST_HARNESS_MAIN -- 2.52.0