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Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 292a778f-20d5-40fe-754f-08ded7754a14 X-MS-Exchange-CrossTenant-AuthSource: IA0PR12MB8374.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Jul 2026 13:33:08.9199 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: IfYRhRSoHvf4zRCl1pn1yqAIeHP4XSt+GFJM9YZJk171vij2ZcM/iqjlPH+vxU3Q X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR12MB7489 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 17A4F20006 X-Rspam-User: X-Stat-Signature: iusdw4385bk6d6hiibhoz5gpb1ted4pb X-HE-Tag: 1782912795-794930 X-HE-Meta: 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RObsxdXq8Pog0tgOypNxd4FtkRL89kXkyN/ts7MsCAqcJX3AR8Aw8n6GRp0pwCfXsifxAtCyO/8yUJUhftLvu6+QcOHSKcCHuIwaKx1Hq8/AO8ZCEZznh4RAHqVki75XLAVKWw425/KWy3QkhUPfvQA4YsqpPvZF6mMtXMdZeVJsKb9kgD6JGdVxZCPNgMc34fhyVZLURxLypm5HhjPuzuf39LP2mqIVWw7UU6neOEe/yOGehQOJB8CDWuJ1mFFD62lhL/1KA/AlObU46wJ14QPqbnwj/X4/t6lr+3pgc4iEIKB3BtUBMKLO/VPuuH7EXOKXw6OwUI+56s++7LamchnxZqbNzab/6laoNjkdWhhcmbbhYn8tdJFrXQuKtJ0Cdo1Z5Rkh2xeSuXxYYWzf2zxRoYgMFVCtng0ZFePHdiyMi2TDLXkWlMf3y8t2HUgt+/1af Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed Jul 1, 2026 at 8:25 AM EDT, Lance Yang wrote: > > On Wed, Jul 01, 2026 at 10:58:21AM +0200, David Hildenbrand (Arm) wrote: >>On 6/29/26 04:56, Zi Yan wrote: >>> With the subpage->private =3D=3D 0 check added in a prior commit, any a= llocated >>> compound page should not have nonzero subpage->private. Remove the > > With Vlastimil's suggestion on patch #03, we still expect tail pages to > have 0 ->private when freed, but only check it when check_pages_enabled > is enabled :) > >>> unnecessary subpage->private initialization code in compound page >>> preparation. >>>=20 >>> Signed-off-by: Zi Yan >>> --- >>> mm/internal.h | 1 - >>> 1 file changed, 1 deletion(-) >>>=20 >>> diff --git a/mm/internal.h b/mm/internal.h >>> index 181e79f1d6a2..c96421ce9350 100644 >>> --- a/mm/internal.h >>> +++ b/mm/internal.h >>> @@ -895,7 +895,6 @@ static inline void prep_compound_tail(struct page *= tail, >>> { >>> tail->mapping =3D TAIL_MAPPING; >>> set_compound_head(tail, head, order); >>> - set_page_private(tail, 0); >> >>Do we want another safety check, maybe another VM_WARN_ON_ONCE? > > Right! I think such a check might still be useful. Same old footgun :P > > Cheers, Lance Sure. Will add a VM_WARN_ON_ONCE(tail->private). --=20 Best Regards, Yan, Zi