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Howlett" , "Vlastimil Babka" , "Mike Rapoport" , "Suren Baghdasaryan" , "Michal Hocko" , "Baolin Wang" , "Nico Pache" , "Ryan Roberts" , "Dev Jain" , "Barry Song" , "Lance Yang" , "Usama Arif" , "Gregory Price" , "Ying Huang" , "Alistair Popple" , "Johannes Weiner" , "Qi Zheng" , "Shakeel Butt" , "Kairui Song" X-Mailer: aerc 0.22.0 References: <20260907-remove-pg_private-v3-0-6ae22f9d9272@nvidia.com> <20260907-remove-pg_private-v3-3-6ae22f9d9272@nvidia.com> In-Reply-To: X-ClientProxiedBy: YQBPR0101CA0188.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:c01:f::31) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|DSSPR12MB999211:EE_ X-MS-Office365-Filtering-Correlation-Id: 2942c721-1277-418e-bc0f-08df0dc01d2a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue Sep 8, 2026 at 11:16 AM EDT, David Hildenbrand (Arm) wrote: > On 9/8/26 04:56, Zi Yan wrote: >> gnttab_alloc_pages() stores xen_page_foreign in page->private. On 32-bit= , a >> pointer to an allocated xen_page_foreign is stored; on 64-bit, >> xen_page_foreign is stored inline. Checking page->private !=3D NULL is e= nough >> to tell whether a xen_page_foreign needs to be freed on 32-bit and >> page->private is zeroed unconditionally on 64-bit. >>=20 >> It prepares for a future commit that remove PG_private. >>=20 >> No functional change intended. >>=20 >> Assisted-by: Claude:claude-opus-4-8 >> Assisted-by: Codex:gpt-5 >> Signed-off-by: Zi Yan >> To: Juergen Gross >> To: Stefano Stabellini >> Cc: Oleksandr Tyshchenko >> Cc: xen-devel@lists.xenproject.org >> Cc: linux-kernel@vger.kernel.org >> --- >> drivers/xen/balloon.c | 5 +++++ >> drivers/xen/grant-table.c | 11 +++++------ >> 2 files changed, 10 insertions(+), 6 deletions(-) >>=20 >> diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c >> index e7f74ea7cd5eb..fdb18348cfdfe 100644 >> --- a/drivers/xen/balloon.c >> +++ b/drivers/xen/balloon.c >> @@ -182,6 +182,11 @@ static struct page *balloon_retrieve(bool require_l= owmem) >> =20 >> __ClearPageOffline(page); >> dec_node_page_state(page, NR_BALLOON_PAGES); >> + /* >> + * clear page->private before giving it out, since it might be used to >> + * store xen_page_foreign info. >> + */ >> + set_page_private(page, 0); > > Who would have set it to !=3D 0 in the first place? No one else, except > > e.g., gnttab_free_pages() resets it to 0 now before calling > xen_free_unpopulated_pages(). After reading more, I agree with you that the above change is unnecesary and will remove it in the next version. Thanks. --=20 Best Regards, Yan, Zi