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GET /api/patches/2216656/?format=api
{ "id": 2216656, "url": "http://patchwork.ozlabs.org/api/patches/2216656/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260327021403.214713-24-usama.arif@linux.dev/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/projects/2/?format=api", "name": "Linux PPC development", "link_name": "linuxppc-dev", "list_id": "linuxppc-dev.lists.ozlabs.org", "list_email": "linuxppc-dev@lists.ozlabs.org", "web_url": "https://github.com/linuxppc/wiki/wiki", "scm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git", "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/", "list_archive_url_format": "https://lore.kernel.org/linuxppc-dev/{}/", "commit_url_format": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}" }, "msgid": "<20260327021403.214713-24-usama.arif@linux.dev>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260327021403.214713-24-usama.arif@linux.dev/", "date": "2026-03-27T02:09:05", "name": "[v3,23/24] selftests/mm: add partial_mremap test for move_page_tables", "commit_ref": null, "pull_url": null, "state": "handled-elsewhere", "archived": false, "hash": "63dd259d8a50f75e6e383fa29f0b25c98eaecb76", "submitter": { "id": 92719, "url": "http://patchwork.ozlabs.org/api/people/92719/?format=api", "name": "Usama Arif", "email": "usama.arif@linux.dev" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260327021403.214713-24-usama.arif@linux.dev/mbox/", "series": [ { "id": 497678, "url": "http://patchwork.ozlabs.org/api/series/497678/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=497678", "date": "2026-03-27T02:08:43", "name": "[v3,01/24] mm: thp: make split_huge_pmd functions return int for error propagation", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/497678/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2216656/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2216656/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-18866-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256\n header.s=key1 header.b=XE9dZB9f;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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Fri, 27 Mar 2026 13:16:42 +1100 (AEDT)" ], "ARC-Seal": "i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1774577803;\n\tcv=none;\n b=Zv+DE3cPnTDlGvFLHdE/l11lQNwAvop1fFGVGFO4zpBnibP9d5YE/NQMvSbUkKldNKJ3+56XeMBDPk2xNh1oERtBJLoRNXACMK/mYKWqpiPKhaEOn7qkzOfHSdcWlubB4q0nWrGJNPLfLmGPtffgq1rte1vfQmLiVOR+zj2rtNrTqN65uWweQebh3k545pIRmukgkgZZ9jpiZF2x4riwqH4d/PPMW5PFy6Sqz9WcAq79DJMnAC+zePVqaU6rnT2mJMmqU4KIrYEZKAFOStFVuRcoshKyRlNZ6zuOpJ1CUdnIvA2bNnX7JRLwoK/rB4ozJoBL1nO5+HLetwfIlO9GUg==", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707;\n\tt=1774577803; c=relaxed/relaxed;\n\tbh=lE7v5lDGM/JWEaWuAACCuFGk8rRw4V1pzGfx+4tEAgA=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version;\n b=LF/AYkczjBTpUS54NZZ7xUwi33hxIsv+JZxP5Wptfw91zJkhAfIYErBQF2ipnCZDz/VbZbutBRj8lDnc1Zb+YYGm96i5qw65y2o0OTMne+HG+LQY2kvnG8Fc8JwSBnW48ZLj7wJHdbUVvYG2ttJ2BVkZlrbwjJmL8ByBNVfkELGH2xbmtfowTOCa5U6qHL9pGnNCENaJ4MMCcGKiAdWd4OFr1rNawqlZQA+UKRpz3BS522+QUoOMypoo43dyUUrH7l83h4UKp4+uI/ProEHE4JiQvhJV69CYclWeV+bheYP39XKdFx9JDP1KHhB2WxaSzSfeihJy6PZHDL+lRpylcw==", "ARC-Authentication-Results": "i=1; lists.ozlabs.org;\n dmarc=pass (p=none dis=none) header.from=linux.dev; dkim=pass (1024-bit key;\n unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256\n header.s=key1 header.b=XE9dZB9f; dkim-atps=neutral;\n spf=pass (client-ip=95.215.58.183; helo=out-183.mta1.migadu.com;\n envelope-from=usama.arif@linux.dev;\n receiver=lists.ozlabs.org) smtp.mailfrom=linux.dev", "X-Report-Abuse": "Please report any abuse attempt to abuse@migadu.com and\n include these headers.", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1;\n\tt=1774577783;\n\th=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n\t to:to:cc:cc:mime-version:mime-version:\n\t content-transfer-encoding:content-transfer-encoding:\n\t in-reply-to:in-reply-to:references:references;\n\tbh=lE7v5lDGM/JWEaWuAACCuFGk8rRw4V1pzGfx+4tEAgA=;\n\tb=XE9dZB9fLZ/OArOngsedrObo//4dofSQ7egtq16n4UZmnM75/spWLYNbGNXdNBcCTBB+Fo\n\tcnGQD1gdIQDl3tgpRirkYMGiJR0/XwR2Cvg+8mZxq+a73pFDK7w6i+bpfpGytLEzfpmE/g\n\tn0aN0IQDsz7hR+A1FcsvHnMT47HCL70=", "From": "Usama Arif <usama.arif@linux.dev>", "To": "Andrew Morton <akpm@linux-foundation.org>,\n\tdavid@kernel.org,\n\tLorenzo Stoakes <ljs@kernel.org>,\n\twilly@infradead.org,\n\tlinux-mm@kvack.org", "Cc": "fvdl@google.com,\n\thannes@cmpxchg.org,\n\triel@surriel.com,\n\tshakeel.butt@linux.dev,\n\tkas@kernel.org,\n\tbaohua@kernel.org,\n\tdev.jain@arm.com,\n\tbaolin.wang@linux.alibaba.com,\n\tnpache@redhat.com,\n\tLiam.Howlett@oracle.com,\n\tryan.roberts@arm.com,\n\tVlastimil Babka <vbabka@kernel.org>,\n\tlance.yang@linux.dev,\n\tlinux-kernel@vger.kernel.org,\n\tkernel-team@meta.com,\n\tmaddy@linux.ibm.com,\n\tmpe@ellerman.id.au,\n\tlinuxppc-dev@lists.ozlabs.org,\n\thca@linux.ibm.com,\n\tgor@linux.ibm.com,\n\tagordeev@linux.ibm.com,\n\tborntraeger@linux.ibm.com,\n\tsvens@linux.ibm.com,\n\tlinux-s390@vger.kernel.org,\n\tUsama Arif <usama.arif@linux.dev>", "Subject": "[v3 23/24] selftests/mm: add partial_mremap test for move_page_tables", "Date": "Thu, 26 Mar 2026 19:09:05 -0700", "Message-ID": "<20260327021403.214713-24-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": "<linuxppc-dev.lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev+help@lists.ozlabs.org>", "List-Owner": "<mailto:linuxppc-dev+owner@lists.ozlabs.org>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Archive": "<https://lore.kernel.org/linuxppc-dev/>,\n <https://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Subscribe": "<mailto:linuxppc-dev+subscribe@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-digest@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-nomail@lists.ozlabs.org>", "List-Unsubscribe": "<mailto:linuxppc-dev+unsubscribe@lists.ozlabs.org>", "Precedence": "list", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Migadu-Flow": "FLOW_OUT", "X-Spam-Status": "No, score=-0.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tDKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_PASS,SPF_PASS autolearn=disabled\n\tversion=4.0.1 OzLabs 8", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org" }, "content": "Add test for partial mremap on THP which exercises move_page_tables().\nThis verifies that partial mremap correctly splits the PMD, moves\nonly the requested page, and preserves data integrity in both the\nmoved region and the original mapping.\n\nSigned-off-by: Usama Arif <usama.arif@linux.dev>\n---\n .../testing/selftests/mm/thp_pmd_split_test.c | 50 +++++++++++++++++++\n 1 file changed, 50 insertions(+)", "diff": "diff --git a/tools/testing/selftests/mm/thp_pmd_split_test.c b/tools/testing/selftests/mm/thp_pmd_split_test.c\nindex 3c9f05457efec..1f29296759a5b 100644\n--- a/tools/testing/selftests/mm/thp_pmd_split_test.c\n+++ b/tools/testing/selftests/mm/thp_pmd_split_test.c\n@@ -203,4 +203,54 @@ TEST_F(thp_pmd_split, partial_mlock)\n \t\tself->split_pmd_failed_before);\n }\n \n+/*\n+ * Partial mremap (move_page_tables)\n+ *\n+ * Tests that partial mremap of a THP correctly splits the PMD and\n+ * moves only the requested portion. This exercises move_page_tables()\n+ * which now handles split failures.\n+ */\n+TEST_F(thp_pmd_split, partial_mremap)\n+{\n+\tvoid *new_addr;\n+\tunsigned long *ptr = (unsigned long *)self->aligned;\n+\tunsigned long *new_ptr;\n+\tunsigned long pattern = 0xABCDUL;\n+\tint ret;\n+\n+\tret = allocate_thp(self->aligned, self->pmdsize);\n+\tif (ret)\n+\t\tSKIP(return, \"Failed to allocate THP\");\n+\n+\t/* Write pattern to the page we'll move */\n+\tptr[self->pagesize / sizeof(unsigned long)] = pattern;\n+\n+\t/* Also write to first and last page to verify they stay intact */\n+\tptr[0] = 0x1234UL;\n+\tptr[(self->pmdsize - self->pagesize) / sizeof(unsigned long)] = 0x4567UL;\n+\n+\t/* Partial mremap - move one base page from the THP */\n+\tnew_addr = mremap((char *)self->aligned + self->pagesize, self->pagesize,\n+\t\t\t self->pagesize, MREMAP_MAYMOVE);\n+\tif (new_addr == MAP_FAILED) {\n+\t\tif (errno == ENOMEM)\n+\t\t\tSKIP(return, \"mremap failed with ENOMEM\");\n+\t\tASSERT_NE(new_addr, MAP_FAILED);\n+\t}\n+\n+\t/* Verify data was moved correctly */\n+\tnew_ptr = (unsigned long *)new_addr;\n+\tASSERT_EQ(new_ptr[0], pattern);\n+\n+\t/* Verify surrounding data is intact */\n+\tASSERT_EQ(ptr[0], 0x1234UL);\n+\tASSERT_EQ(ptr[(self->pmdsize - self->pagesize) / sizeof(unsigned long)], 0x4567UL);\n+\n+\t/* Cleanup the moved page */\n+\tmunmap(new_addr, self->pagesize);\n+\n+\tlog_and_check_pmd_split(_metadata, self->split_pmd_before,\n+\t\tself->split_pmd_failed_before);\n+}\n+\n TEST_HARNESS_MAIN\n", "prefixes": [ "v3", "23/24" ] }