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GET /api/1.1/patches/2180676/?format=api
{ "id": 2180676, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2180676/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260107091823.68974-10-jniethe@nvidia.com/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/1.1/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/" }, "msgid": "<20260107091823.68974-10-jniethe@nvidia.com>", "date": "2026-01-07T09:18:21", "name": "[v2,09/11] mm/util: Add flag to track device private pages in page snapshots", "commit_ref": null, "pull_url": null, "state": "handled-elsewhere", "archived": false, "hash": "219de50f711c762856a3fefe0841bbb4c86143c7", "submitter": { "id": 92354, "url": "http://patchwork.ozlabs.org/api/1.1/people/92354/?format=api", "name": "Jordan Niethe", "email": "jniethe@nvidia.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260107091823.68974-10-jniethe@nvidia.com/mbox/", "series": [ { "id": 487451, "url": "http://patchwork.ozlabs.org/api/1.1/series/487451/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=487451", "date": "2026-01-07T09:18:12", "name": "Remove device private pages from physical address space", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/487451/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2180676/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2180676/checks/", "tags": {}, "headers": { "Return-Path": "\n <linuxppc-dev+bounces-15372-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linuxppc-dev@lists.ozlabs.org" 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"balbirs@nvidia.com,\n\tmatthew.brost@intel.com,\n\takpm@linux-foundation.org,\n\tlinux-kernel@vger.kernel.org,\n\tdri-devel@lists.freedesktop.org,\n\tdavid@redhat.com,\n\tziy@nvidia.com,\n\tapopple@nvidia.com,\n\tlorenzo.stoakes@oracle.com,\n\tlyude@redhat.com,\n\tdakr@kernel.org,\n\tairlied@gmail.com,\n\tsimona@ffwll.ch,\n\trcampbell@nvidia.com,\n\tmpenttil@redhat.com,\n\tjgg@nvidia.com,\n\twilly@infradead.org,\n\tlinuxppc-dev@lists.ozlabs.org,\n\tintel-xe@lists.freedesktop.org,\n\tjgg@ziepe.ca,\n\tFelix.Kuehling@amd.com", "Subject": "[PATCH v2 09/11] mm/util: Add flag to track device private pages in\n page snapshots", "Date": "Wed, 7 Jan 2026 20:18:21 +1100", "Message-Id": "<20260107091823.68974-10-jniethe@nvidia.com>", "X-Mailer": "git-send-email 2.34.1", "In-Reply-To": "<20260107091823.68974-1-jniethe@nvidia.com>", "References": "<20260107091823.68974-1-jniethe@nvidia.com>", "Content-Transfer-Encoding": "8bit", "Content-Type": "text/plain", "X-ClientProxiedBy": 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"X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org" }, "content": "A future change will remove device private pages from the physical\naddress space. This will mean that device private pages no longer have\nnormal pfns and must be handled separately.\n\nAdd a new flag PAGE_SNAPSHOT_DEVICE_PRIVATE to track when the pfn of a\npage snapshot is a device private page.\n\nSigned-off-by: Jordan Niethe <jniethe@nvidia.com>\nSigned-off-by: Alistair Popple <apopple@nvidia.com>\n---\nv1:\n - No change\nv2:\n - No change\n---\n fs/proc/page.c | 6 ++++--\n include/linux/mm.h | 7 ++++---\n mm/util.c | 3 +++\n 3 files changed, 11 insertions(+), 5 deletions(-)", "diff": "diff --git a/fs/proc/page.c b/fs/proc/page.c\nindex f9b2c2c906cd..adca0e681442 100644\n--- a/fs/proc/page.c\n+++ b/fs/proc/page.c\n@@ -191,10 +191,12 @@ u64 stable_page_flags(const struct page *page)\n \t folio_test_large_rmappable(folio)) {\n \t\t/* Note: we indicate any THPs here, not just PMD-sized ones */\n \t\tu |= 1 << KPF_THP;\n-\t} else if (is_huge_zero_pfn(ps.pfn)) {\n+\t} else if (!(ps.flags & PAGE_SNAPSHOT_DEVICE_PRIVATE) &&\n+\t\t is_huge_zero_pfn(ps.pfn)) {\n \t\tu |= 1 << KPF_ZERO_PAGE;\n \t\tu |= 1 << KPF_THP;\n-\t} else if (is_zero_pfn(ps.pfn)) {\n+\t} else if (!(ps.flags & PAGE_SNAPSHOT_DEVICE_PRIVATE)\n+\t\t && is_zero_pfn(ps.pfn)) {\n \t\tu |= 1 << KPF_ZERO_PAGE;\n \t}\n \ndiff --git a/include/linux/mm.h b/include/linux/mm.h\nindex 15076261d0c2..e65329e1969f 100644\n--- a/include/linux/mm.h\n+++ b/include/linux/mm.h\n@@ -4623,9 +4623,10 @@ static inline bool page_pool_page_is_pp(const struct page *page)\n }\n #endif\n \n-#define PAGE_SNAPSHOT_FAITHFUL (1 << 0)\n-#define PAGE_SNAPSHOT_PG_BUDDY (1 << 1)\n-#define PAGE_SNAPSHOT_PG_IDLE (1 << 2)\n+#define PAGE_SNAPSHOT_FAITHFUL\t\t(1 << 0)\n+#define PAGE_SNAPSHOT_PG_BUDDY\t\t(1 << 1)\n+#define PAGE_SNAPSHOT_PG_IDLE\t\t(1 << 2)\n+#define PAGE_SNAPSHOT_DEVICE_PRIVATE\t(1 << 3)\n \n struct page_snapshot {\n \tstruct folio folio_snapshot;\ndiff --git a/mm/util.c b/mm/util.c\nindex 97cae40c0209..65e3f1a97d76 100644\n--- a/mm/util.c\n+++ b/mm/util.c\n@@ -1218,6 +1218,9 @@ static void set_ps_flags(struct page_snapshot *ps, const struct folio *folio,\n \n \tif (folio_test_idle(folio))\n \t\tps->flags |= PAGE_SNAPSHOT_PG_IDLE;\n+\n+\tif (is_device_private_page(page))\n+\t\tps->flags |= PAGE_SNAPSHOT_DEVICE_PRIVATE;\n }\n \n /**\n", "prefixes": [ "v2", "09/11" ] }