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Subject: Re: [PATCH v2 3/6] mm/page_owner: hoist CONFIG_MEMCG to function level for print_page_owner_memcg() Cc: "Suren Baghdasaryan" , "Michal Hocko" , "Brendan Jackman" , "Johannes Weiner" , , To: "Ye Liu" , "Andrew Morton" , "Vlastimil Babka" X-Mailer: aerc 0.21.0 References: <20260626024550.25677-1-ye.liu@linux.dev> <20260626024550.25677-4-ye.liu@linux.dev> In-Reply-To: <20260626024550.25677-4-ye.liu@linux.dev> X-ClientProxiedBy: BLAPR03CA0097.namprd03.prod.outlook.com (2603:10b6:208:32a::12) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|CH3PR12MB7666:EE_ X-MS-Office365-Filtering-Correlation-Id: ed4007ed-9976-4c6c-6e12-08ded3b40661 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|1800799024|23010399003|22082099003|18002099003|4143699003|11063799006|56012099006; X-Microsoft-Antispam-Message-Info: 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Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: ed4007ed-9976-4c6c-6e12-08ded3b40661 X-MS-Exchange-CrossTenant-AuthSource: IA0PR12MB8374.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Jun 2026 18:52:08.9546 (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: nw6TUzCsS/TsFUjladMZvZMuNbIZ3cw7cxGGT4z4SgeUu/l6wpSA1CPng8IEndlV X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB7666 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 1ABEB40004 X-Rspam-User: X-Stat-Signature: h1ocissz1wnaqdaqfwgjy5w6dpzgygx1 X-HE-Tag: 1782499938-170965 X-HE-Meta: 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mjcDAM/1wfAP6PvyGpZXBOtpgdBQXDGNSvvKBmoF+40owHbqpyQqnbHafsQGc+CFMicxEmSl54V98D2zJzoW4EgQILKr8Du/RSW4qoHQRgZxux134YJ8Y6M/ed/ChjeHyC6kn9n/N8zR6wxQ7meC1n9PIFI/Xq45DpWAJtJD9dl4rB01zIvSlOeX4X7cBFEygbGIoe4B7JjkupQlkvDLcCKfGacbtnT5js9ykUcsANr9X8eRJ+1SUQGjPCPBlUL1ZZme3fA2246X2+Mb/IBMIdZhz4qKj8wxz4R9Hh8aRC1/14YsVA2Ig5W6sbiqWswuGiPXEIIGRnxyBz7Z7sRgWsYhZ6H9cImz7Zch0zLLHwlsP4qqvERaE7A2sfUcyFbr3n19hpbdDJkEgqaolmh5jWeXCkD/Ukl4ElnDGw4a8nCDdyLlqMH2xcfSQoxc+fzKFJ0Io Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu Jun 25, 2026 at 10:45 PM EDT, Ye Liu wrote: > The print_page_owner_memcg() function has CONFIG_MEMCG guarding its > entire body via #ifdef inside the function, which leaves a no-op no-op might not be accurate, since the purpose is not to change scnprintf() return values from prior invocations. Maybe just remove "no-op" in the commit message to avoid confusion. > { return ret; } when the config is disabled. Hoist the #ifdef to the > top level so the real implementation and the empty stub are two clearly > separated definitions. > > No functional change. > > Signed-off-by: Ye Liu > --- > mm/page_owner.c | 10 ++++++++-- > 1 file changed, 8 insertions(+), 2 deletions(-) > > +#else > +static inline int print_page_owner_memcg(char *kbuf, size_t count, int r= et, > + struct page *page) > +{ > + return ret; It is not obvious why we need to return ret here, until I find that ret cumulates scnprintf() return values. > +} > +#endif > =20 > static ssize_t > print_page_owner(char __user *buf, size_t count, unsigned long pfn, LGTM. Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi