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GET /api/1.2/patches/2219939/?format=api
{ "id": 2219939, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2219939/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260405125240.2558577-15-songmuchun@bytedance.com/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/1.2/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": "<20260405125240.2558577-15-songmuchun@bytedance.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260405125240.2558577-15-songmuchun@bytedance.com/", "date": "2026-04-05T12:52:05", "name": "[14/49] mm/cma: validate hugetlb CMA range by zone at reserve time", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "51f29a2a499dea9913fc7a71bec9976497d903e1", "submitter": { "id": 78930, "url": "http://patchwork.ozlabs.org/api/1.2/people/78930/?format=api", "name": "Muchun Song", "email": "songmuchun@bytedance.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260405125240.2558577-15-songmuchun@bytedance.com/mbox/", "series": [ { "id": 498783, "url": "http://patchwork.ozlabs.org/api/1.2/series/498783/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=498783", "date": "2026-04-05T12:51:51", "name": "mm: Generalize vmemmap optimization for DAX and HugeTLB", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/498783/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2219939/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2219939/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-19344-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 (2048-bit key;\n unprotected) header.d=bytedance.com header.i=@bytedance.com\n header.a=rsa-sha256 header.s=google header.b=gfOiV+YW;\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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Howlett\" <Liam.Howlett@oracle.com>,\n\tVlastimil Babka <vbabka@kernel.org>,\n\tMike Rapoport <rppt@kernel.org>,\n\tSuren Baghdasaryan <surenb@google.com>,\n\tMichal Hocko <mhocko@suse.com>,\n\tNicholas Piggin <npiggin@gmail.com>,\n\tChristophe Leroy <chleroy@kernel.org>,\n\taneesh.kumar@linux.ibm.com,\n\tjoao.m.martins@oracle.com,\n\tlinux-mm@kvack.org,\n\tlinuxppc-dev@lists.ozlabs.org,\n\tlinux-kernel@vger.kernel.org,\n\tMuchun Song <songmuchun@bytedance.com>", "Subject": "[PATCH 14/49] mm/cma: validate hugetlb CMA range by zone at reserve\n time", "Date": "Sun, 5 Apr 2026 20:52:05 +0800", "Message-Id": "<20260405125240.2558577-15-songmuchun@bytedance.com>", "X-Mailer": "git-send-email 2.20.1", "In-Reply-To": "<20260405125240.2558577-1-songmuchun@bytedance.com>", "References": "<20260405125240.2558577-1-songmuchun@bytedance.com>", "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-Spam-Status": "No, score=-0.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tDKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,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": "During hugetlb_cma_reserve() we already have access to zone information, so we\ncan validate that the reserved CMA range does not span multiple zones.\n\nDoing this check up front allows future hugetlb allocations from CMA to assume\nzone-valid CMA areas, avoiding additional validity checks and potential\nfallback/rollback paths, greatly simplifying the code.\n\nThe pfn_valid() check is removed from cma_validate_zones() because mem_section is\nnot initialized at that stage and it can trigger false warnings; keep the\nsanity check in cma_activate_area() instead. This is preparatory work for the\nfollow-up simplification.\n\nSigned-off-by: Muchun Song <songmuchun@bytedance.com>\n---\n mm/cma.c | 3 ++-\n mm/hugetlb_cma.c | 3 ++-\n 2 files changed, 4 insertions(+), 2 deletions(-)", "diff": "diff --git a/mm/cma.c b/mm/cma.c\nindex 15cc0ae76c8e..dd046a23f467 100644\n--- a/mm/cma.c\n+++ b/mm/cma.c\n@@ -125,7 +125,6 @@ bool cma_validate_zones(struct cma *cma)\n \t\t * to be in the same zone. Simplify by forcing the entire\n \t\t * CMA resv range to be in the same zone.\n \t\t */\n-\t\tWARN_ON_ONCE(!pfn_valid(base_pfn));\n \t\tif (pfn_range_intersects_zones(cma->nid, base_pfn, cmr->count)) {\n \t\t\tset_bit(CMA_ZONES_INVALID, &cma->flags);\n \t\t\treturn false;\n@@ -164,6 +163,8 @@ static void __init cma_activate_area(struct cma *cma)\n \t\t\tbitmap_set(cmr->bitmap, 0, bitmap_count);\n \t\t}\n \n+\t\tWARN_ON_ONCE(!pfn_valid(cmr->base_pfn));\n+\n \t\tfor (pfn = early_pfn[r]; pfn < cmr->base_pfn + cmr->count;\n \t\t pfn += pageblock_nr_pages)\n \t\t\tinit_cma_reserved_pageblock(pfn_to_page(pfn));\ndiff --git a/mm/hugetlb_cma.c b/mm/hugetlb_cma.c\nindex f83ae4998990..b068e9bf6537 100644\n--- a/mm/hugetlb_cma.c\n+++ b/mm/hugetlb_cma.c\n@@ -233,9 +233,10 @@ void __init hugetlb_cma_reserve(void)\n \t\tres = cma_declare_contiguous_multi(size, PAGE_SIZE << order,\n \t\t\t\t\tHUGETLB_PAGE_ORDER, name,\n \t\t\t\t\t&hugetlb_cma[nid], nid);\n-\t\tif (res) {\n+\t\tif (res || !cma_validate_zones(hugetlb_cma[nid])) {\n \t\t\tpr_warn(\"hugetlb_cma: reservation failed: err %d, node %d\",\n \t\t\t\tres, nid);\n+\t\t\thugetlb_cma[nid] = NULL;\n \t\t\tcontinue;\n \t\t}\n \n", "prefixes": [ "14/49" ] }