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[129.46.96.20]) by smtp.gmail.com with ESMTPSA id 5614622812f47-464bb59b66fsm7354528b6e.10.2026.03.02.03.17.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Mar 2026 03:18:00 -0800 (PST) From: Yuvraj Sakshith To: akpm@linux-foundation.org, mst@redhat.com, david@kernel.org, jasowang@redhat.com, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com Cc: linux-mm@kvack.org, virtualization@lists.linux.dev, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, xuanzhuo@linux.alibaba.com, eperezma@redhat.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, jackmanb@google.com, hannes@cmpxchg.org, ziy@nvidia.com Subject: [PATCH v2 1/4] mm/page_reporting: add PAGE_REPORTING_ORDER_UNSPECIFIED Date: Mon, 2 Mar 2026 03:17:54 -0800 Message-Id: <20260302111757.2191056-2-yuvraj.sakshith@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260302111757.2191056-1-yuvraj.sakshith@oss.qualcomm.com> References: <20260302111757.2191056-1-yuvraj.sakshith@oss.qualcomm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Authority-Analysis: v=2.4 cv=BI++bVQG c=1 sm=1 tr=0 ts=69a571ea cx=c_pps a=yymyAM/LQ7lj/HqAiIiKTw==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=EUspDBNiAAAA:8 a=DkB-CqvKoiMeaEFB2csA:9 a=efpaJB4zofY2dbm2aIRb:22 X-Proofpoint-GUID: Ln8UwMEBvSpO86pvdnJS2_OSKSCJDwvV X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzAyMDA5MyBTYWx0ZWRfX2W0kldFzHZjW kHPkfL1H7jiO0+Me7sLeX8tUFNl3By+v57xYcWyFeVb5zT59taaLwASGevhSZwxdla/8d+p1MZP CiSzzQeDt/rBSiMQ2iZOEelUsSpVXdoXMLXB3LXiL4S9Wjw8iD3xD2wroFZg/+QMWAZT54hu2OQ GqCfkAaPy/QHs2vEhIUsXEN9r41Q+niMuOdkPmASiWtBmCxDj/FR0CX4TyRpsRQFRlEhqO+ud4O EycNCYNyNMPa95X/PYrpK6qgEX3VylairlZaJaB1TwTIWIG0xXODp35Kqq8kg4Y1IrMG3Yrd0Qo mdtwW6u99HSj3MaMaCAoxZ35v1GiB7tvWovWtgV+/JiClOZc1JyyhuuNC+as1x9wECmllC6eTZ4 X/jjKkDW8ZIxQ01rPj8KjPRfOk7yUb3+GRmTrqnTEKxnuLDnVa56cFK6IKGVYC9f1QIDoecQHj1 pPm8RHSskfjddSS2s8w== X-Proofpoint-ORIG-GUID: Ln8UwMEBvSpO86pvdnJS2_OSKSCJDwvV X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-02_03,2026-02-27_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 clxscore=1015 lowpriorityscore=0 bulkscore=0 phishscore=0 spamscore=0 adultscore=0 impostorscore=0 priorityscore=1501 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603020093 X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: BD389100015 X-Stat-Signature: cadpd38dxwz3htkjcbe1gmw7k8nong8q X-HE-Tag: 1772450283-13071 X-HE-Meta: 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 OlE0IMPP 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Drivers can pass order of pages to be reported while registering itself. Today, this is a magic number, 0. Label this with PAGE_REPORTING_ORDER_UNSPECIFIED and check for it when the driver is being registered. This macro will be used in relevant drivers next. Signed-off-by: Yuvraj Sakshith --- include/linux/page_reporting.h | 1 + mm/page_reporting.c | 14 +++++--------- 2 files changed, 6 insertions(+), 9 deletions(-) diff --git a/include/linux/page_reporting.h b/include/linux/page_reporting.h index fe648dfa3..d1886c657 100644 --- a/include/linux/page_reporting.h +++ b/include/linux/page_reporting.h @@ -7,6 +7,7 @@ /* This value should always be a power of 2, see page_reporting_cycle() */ #define PAGE_REPORTING_CAPACITY 32 +#define PAGE_REPORTING_ORDER_UNSPECIFIED 0 struct page_reporting_dev_info { /* function that alters pages to make them "reported" */ diff --git a/mm/page_reporting.c b/mm/page_reporting.c index e4c428e61..51cd88faf 100644 --- a/mm/page_reporting.c +++ b/mm/page_reporting.c @@ -12,7 +12,7 @@ #include "internal.h" /* Initialize to an unsupported value */ -unsigned int page_reporting_order = -1; +unsigned int page_reporting_order = PAGE_REPORTING_ORDER_UNSPECIFIED; static int page_order_update_notify(const char *val, const struct kernel_param *kp) { @@ -25,12 +25,7 @@ static int page_order_update_notify(const char *val, const struct kernel_param * static const struct kernel_param_ops page_reporting_param_ops = { .set = &page_order_update_notify, - /* - * For the get op, use param_get_int instead of param_get_uint. - * This is to make sure that when unset the initialized value of - * -1 is shown correctly - */ - .get = ¶m_get_int, + .get = ¶m_get_uint, }; module_param_cb(page_reporting_order, &page_reporting_param_ops, @@ -369,8 +364,9 @@ int page_reporting_register(struct page_reporting_dev_info *prdev) * pageblock_order. */ - if (page_reporting_order == -1) { - if (prdev->order > 0 && prdev->order <= MAX_PAGE_ORDER) + if (page_reporting_order == PAGE_REPORTING_ORDER_UNSPECIFIED) { + if (prdev->order != PAGE_REPORTING_ORDER_UNSPECIFIED && + prdev->order <= MAX_PAGE_ORDER) page_reporting_order = prdev->order; else page_reporting_order = pageblock_order; -- 2.34.1