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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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Authority-Analysis: v=2.4 cv=GMMF0+NK c=1 sm=1 tr=0 ts=69a571ea cx=c_pps a=4ztaESFFfuz8Af0l9swBwA==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=EUspDBNiAAAA:8 a=DkB-CqvKoiMeaEFB2csA:9 a=TPnrazJqx2CeVZ-ItzZ-:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzAyMDA5MyBTYWx0ZWRfX8MedoSYrbY6F CLwehz7V67EPjwJP0dUvaz438eZCqK2M53ipUNzj6nZU1V+IF/X6Jh3W1+hbsVJsPJE8st7VvnR dCw0upfl+sIGU2O+f4ckYj6lbPY+4XVclk9okHQCKQzs8Yt4ydSLmgZ44kzHlabMbIY0Ljt/Rrs dbdSclseoksTyFnyvJzCMfKdZeo9BGsQTeQpGg3QQoUUfGFHQnD5hZiT7T9lzt3w5ijTyzqKZFt waIoUx3MhSCnuy8b8OFicrQ1VuLfXFzCUhPj1hd30/2y0jVUx/R2SGuUQXQu4Hjk5xxT31mE5rA TxlyRYtfRYIM7Qk1p6+9T2FVLKfLBo60Sw1fy4bavWN1d8JVplYluyzM8RgsqHesNLdO75gaFAn a623H++/TPNXpCXDVJfTH8Dwwr4H5KizAc2hJXXFZ3Yx9ugym71hBQc8Lo0JM5icSjNKUtgYpJH ED/U9d4qFf02JFyDiTg== X-Proofpoint-GUID: rDYq01ccAyZYfD2PD7FVfIlL7JO0GTk9 X-Proofpoint-ORIG-GUID: rDYq01ccAyZYfD2PD7FVfIlL7JO0GTk9 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 bulkscore=0 clxscore=1015 lowpriorityscore=0 spamscore=0 adultscore=0 priorityscore=1501 impostorscore=0 phishscore=0 malwarescore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603020093 Content-Type: text/plain; charset="utf-8" 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 @@ =20 /* This value should always be a power of 2, see page_reporting_cycle() */ #define PAGE_REPORTING_CAPACITY 32 +#define PAGE_REPORTING_ORDER_UNSPECIFIED 0 =20 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" =20 /* Initialize to an unsupported value */ -unsigned int page_reporting_order =3D -1; +unsigned int page_reporting_order =3D PAGE_REPORTING_ORDER_UNSPECIFIED; =20 static int page_order_update_notify(const char *val, const struct kernel_p= aram *kp) { @@ -25,12 +25,7 @@ static int page_order_update_notify(const char *val, con= st struct kernel_param * =20 static const struct kernel_param_ops page_reporting_param_ops =3D { .set =3D &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 =3D ¶m_get_int, + .get =3D ¶m_get_uint, }; =20 module_param_cb(page_reporting_order, &page_reporting_param_ops, @@ -369,8 +364,9 @@ int page_reporting_register(struct page_reporting_dev_i= nfo *prdev) * pageblock_order. */ =20 - if (page_reporting_order =3D=3D -1) { - if (prdev->order > 0 && prdev->order <=3D MAX_PAGE_ORDER) + if (page_reporting_order =3D=3D PAGE_REPORTING_ORDER_UNSPECIFIED) { + if (prdev->order !=3D PAGE_REPORTING_ORDER_UNSPECIFIED && + prdev->order <=3D MAX_PAGE_ORDER) page_reporting_order =3D prdev->order; else page_reporting_order =3D pageblock_order; --=20 2.34.1