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GET /api/patches/2216654/?format=api
{ "id": 2216654, "url": "http://patchwork.ozlabs.org/api/patches/2216654/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260327021403.214713-22-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": "<20260327021403.214713-22-usama.arif@linux.dev>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260327021403.214713-22-usama.arif@linux.dev/", "date": "2026-03-27T02:09:03", "name": "[v3,21/24] selftests/mm: add partial_mprotect test for change_pmd_range", "commit_ref": null, "pull_url": null, "state": "handled-elsewhere", "archived": false, "hash": "7dfa9f4b3ca3b48d798d9365f4561b7b5b6887e0", "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/20260327021403.214713-22-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/2216654/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2216654/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-18864-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=YkBnJlAA;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; 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Fri, 27 Mar 2026 13:16:31 +1100 (AEDT)" ], "ARC-Seal": "i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1774577792;\n\tcv=none;\n b=Hb31EfnffRTVwJGUPKl/Oi/CEdW/RKtzn7i3lOw4d5NP8GPA3wcRXD3+F7j8wYxYsSQ0wK3+Yxwtp9F8y6K6wR6mQzMqcID2iDA9+32DDlHUWL44+i5fu++qvwPaOlKByfNCrsKpvV0yGAFQVAc+0jeMVrX88ujvqJmczXQnQqPa+b7h0F/N+A9nn/eALKB82vXCAloK/vLfBmMMk5v+6Dm+R53MJbLIRU+ecAWLBKXUlRWP1DAY0y7kWQjzS6TqhCHtDQrO4tJiHK1bc/vOXE+1DkHO/H2KYX0rDlU8S0iJuOrVHh8HM9clwuaWBq4yNmaVpZBArDhhAPPYSKofBA==", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707;\n\tt=1774577792; c=relaxed/relaxed;\n\tbh=KBHgpp/Hlt3gblMxOihtIUK/6fHGYOfso38xhE/8i5Y=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version;\n b=H//3FJMPvJD6t1kvwRy7t55upX4rbvsmtfgvqjKRA+zWulSvqTaPmG37AeDim5VJjP54mCzvaNGm0eWhDJ7ImsYiiwR2YMBK3ohwCa7LwcEgWDUAWgL6TJG18PBVApYReLz+UVGf0D5l4WblXGAm6X+DCzRaGLN/7+HsCrsExtLW+gGp8blViqCKTBFiEZ0qKGSefjslE2f4X/ixe8BCT63+jjUy7cENTU7n0Xz7Gb80op95AQ/UsJYt6rEaQXEalDVnGeN9h2LC+1Go0tm3rZQyDjr+hhbgdUyKxSKJ+TWU963Di2tj7whdxiFaZpd2LPIbbBEgeVf/PjihH9SGHQ==", "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=YkBnJlAA; dkim-atps=neutral;\n spf=pass (client-ip=91.218.175.189; helo=out-189.mta0.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=1774577772;\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=KBHgpp/Hlt3gblMxOihtIUK/6fHGYOfso38xhE/8i5Y=;\n\tb=YkBnJlAAFSpKbHZ97+87mwwuiOpaKGfMki0IODGcWo+ltRqHD5dxWBr38RHva/Za8up5uN\n\tsjKP0IWJ4LKydgafIE8LafBBavHbtcDNVR0+2IRtgtbgOEykPv1ek68+Pcb9SQy5kozeBm\n\tTXn8jzFa4saniUkUmgk+kYIpggBjy8U=", "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 21/24] selftests/mm: add partial_mprotect test for\n change_pmd_range", "Date": "Thu, 26 Mar 2026 19:09:03 -0700", "Message-ID": "<20260327021403.214713-22-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=-0.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tDKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_LOW,SPF_HELO_PASS,SPF_PASS\n\tautolearn=disabled version=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 mprotect on THP which exercises change_pmd_range().\nThis verifies that partial mprotect correctly splits the PMD, applies\nprotection only to the requested portion, and leaves the rest of the\nmapping writable.\n\nSigned-off-by: Usama Arif <usama.arif@linux.dev>\n---\n .../testing/selftests/mm/thp_pmd_split_test.c | 31 +++++++++++++++++++\n 1 file changed, 31 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 0f54ac04760d5..4944a5a516da9 100644\n--- a/tools/testing/selftests/mm/thp_pmd_split_test.c\n+++ b/tools/testing/selftests/mm/thp_pmd_split_test.c\n@@ -146,4 +146,35 @@ TEST_F(thp_pmd_split, partial_munmap)\n \t\tself->split_pmd_failed_before);\n }\n \n+/*\n+ * Partial mprotect on THP (change_pmd_range)\n+ *\n+ * Tests that partial mprotect of a THP correctly splits the PMD and\n+ * applies protection only to the requested portion. This exercises\n+ * the mprotect path which now handles split failures.\n+ */\n+TEST_F(thp_pmd_split, partial_mprotect)\n+{\n+\tvolatile unsigned char *ptr = (volatile unsigned char *)self->aligned;\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/* Partial mprotect - make middle page read-only */\n+\tret = mprotect((char *)self->aligned + self->pagesize, self->pagesize, PROT_READ);\n+\tASSERT_EQ(ret, 0);\n+\n+\t/* Verify we can still write to non-protected pages */\n+\tptr[0] = 0xDD;\n+\tptr[self->pmdsize - 1] = 0xEE;\n+\n+\tASSERT_EQ(ptr[0], (unsigned char)0xDD);\n+\tASSERT_EQ(ptr[self->pmdsize - 1], (unsigned char)0xEE);\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", "21/24" ] }