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[129.46.96.20]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-7d5866269a8sm4324502a34.13.2026.02.27.06.07.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 Feb 2026 06:07:01 -0800 (PST) From: Yuvraj Sakshith To: akpm@linux-foundation.org Cc: mst@redhat.com, david@kernel.org, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, longli@microsoft.com, jasowang@redhat.com, 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, linux-hyperv@vger.kernel.org, virtualization@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v1 1/4] page_reporting: add PAGE_REPORTING_DEFAULT_ORDER Date: Fri, 27 Feb 2026 06:06:52 -0800 Message-Id: <20260227140655.360696-2-yuvraj.sakshith@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260227140655.360696-1-yuvraj.sakshith@oss.qualcomm.com> References: <20260227140655.360696-1-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-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjI3MDEyNSBTYWx0ZWRfXxRkgNEW9Yq+j +zwTjnRfRj1I5IhUZ7fztD6JUZnRE3djxXCCd7cI2qnGDibYCtgg/KqDSbe9+llsdgkfNbRU0rN i428Pcho6qmJuclMHGmEcN3C+PqmZNMoORDfDNGdv3AbgRJ4AC4kjevhh0kdkmesXgtmhcuGebF mxq3A2NY4Pqw4C6TB5ls4xYfFzpd6UkUXVZFwoohyHzPMp9LXRNEGylRUCpHr+VABbIdZdFlY7Y b2cLXSOK1cjTtu7sGhHtYM9ULqKwLDgaRzaJsOBEnLCMzRqdbXzgbKQ3np1ualgLhPDNHDdW034 CSggVJOsRF4apPSarQIFjdqIRved559xEurZP+C0UyRpvzl6uHycVWtOsjCGXTpZlAB2ApaPtZW XKsxlBphvxcT22a8+Y9bhsIi9vNPA1pggU8gQmc7pRLeZcILE5AuHMq7CbUaJgguTSSoW0X6pp6 zltBLY5HIcm7zX3HiTA== X-Proofpoint-GUID: 7Bx1-ajiED0ul-CtoqIIyq0UdUxcA5Kh X-Authority-Analysis: v=2.4 cv=bIsb4f+Z c=1 sm=1 tr=0 ts=69a1a507 cx=c_pps a=z9lCQkyTxNhZyzAvolXo/A==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=HzLeVaNsDn8A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=EUspDBNiAAAA:8 a=agIWOxjPXKrzBStnBTYA:9 a=EyFUmsFV_t8cxB2kMr4A:22 X-Proofpoint-ORIG-GUID: 7Bx1-ajiED0ul-CtoqIIyq0UdUxcA5Kh 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=2026-02-27_02,2026-02-27_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 spamscore=0 phishscore=0 impostorscore=0 suspectscore=0 malwarescore=0 bulkscore=0 clxscore=1015 priorityscore=1501 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2602270125 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_DEFAULT_ORDER and check for it when the driver is being registered. Signed-off-by: Yuvraj Sakshith Acked-by: David Hildenbrand (Arm) --- include/linux/page_reporting.h | 1 + mm/page_reporting.c | 3 ++- 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/include/linux/page_reporting.h b/include/linux/page_reporting.h index fe648dfa3..a7e3e30f2 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_DEFAULT_ORDER 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..9ad4fc3f8 100644 --- a/mm/page_reporting.c +++ b/mm/page_reporting.c @@ -370,7 +370,8 @@ int page_reporting_register(struct page_reporting_dev_i= nfo *prdev) */ =20 if (page_reporting_order =3D=3D -1) { - if (prdev->order > 0 && prdev->order <=3D MAX_PAGE_ORDER) + if (prdev->order !=3D PAGE_REPORTING_DEFAULT_ORDER && + prdev->order <=3D MAX_PAGE_ORDER) page_reporting_order =3D prdev->order; 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[129.46.96.20]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-7d5866269a8sm4324502a34.13.2026.02.27.06.07.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 Feb 2026 06:07:03 -0800 (PST) From: Yuvraj Sakshith To: akpm@linux-foundation.org Cc: mst@redhat.com, david@kernel.org, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, longli@microsoft.com, jasowang@redhat.com, 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, linux-hyperv@vger.kernel.org, virtualization@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v1 2/4] virtio_balloon: set default page reporting order Date: Fri, 27 Feb 2026 06:06:53 -0800 Message-Id: <20260227140655.360696-3-yuvraj.sakshith@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260227140655.360696-1-yuvraj.sakshith@oss.qualcomm.com> References: <20260227140655.360696-1-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=IZWKmGqa c=1 sm=1 tr=0 ts=69a1a508 cx=c_pps a=z9lCQkyTxNhZyzAvolXo/A==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=HzLeVaNsDn8A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=EUspDBNiAAAA:8 a=Jvdq4yWlxvBRgq3Xg-wA:9 a=EyFUmsFV_t8cxB2kMr4A:22 X-Proofpoint-GUID: CNzuiYvRGBz5aFwyrnKezca6ZpZSHCUD X-Proofpoint-ORIG-GUID: CNzuiYvRGBz5aFwyrnKezca6ZpZSHCUD X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjI3MDEyNSBTYWx0ZWRfX0Al726w/ICAm ZZ8S1iYpqEjzhPa6E4bf/eKJVZrE0uPn/FPvgirRP0Kkac9RwmMB3nEnARzjcE3At4qnREMVw7F eMbg8kroEQf3CPox+eIepkfJijTTZB6yTRblVl7MKhoVNrX39zNfjIgkQggIDmRgSFC41uCjmDt 35JtKK/jiw+LSarsMAWGl4TkdtLSuofGmqL+qCsG1Sb2m49oGr83+1LW5JXhoZuXCrEeZcrJTMr aWkbYObjkMbsHajYrfLrryvZ7v4kTo3xpZMzku5movEcbJCcq4IL3wnJJizNdoIZtuiAu8ib7y8 XyFjbiv1rZrpypsAvC763l1nxCpoSDmias1EJBim2UIdvjFNwvC91JGVXuhztfVFiNEQO/zBY+/ 1Bqxyszgv66NuNwla1pQXQ6be0lDC4QlNEJc+j1YQ2vm+o95Ujsrl9cY5GUjA/4BE8Am97jXvqN 3OlIrHrYNhdy5aLWOJw== 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=2026-02-27_02,2026-02-27_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 impostorscore=0 clxscore=1015 adultscore=0 lowpriorityscore=0 priorityscore=1501 suspectscore=0 malwarescore=0 spamscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2602270125 Content-Type: text/plain; charset="utf-8" virtio_balloon page reporting order is set to MAX_PAGE_ORDER implicitly as vb->prdev.order is never initialised and is auto-set to zero. Explicitly mention usage of default page order by making use of PAGE_REPORTING_DEFAULT ORDER fallback value. Signed-off-by: Yuvraj Sakshith Acked-by: David Hildenbrand (Arm) --- drivers/virtio/virtio_balloon.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloo= n.c index 74fe59f5a..0616c03b2 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -1044,6 +1044,8 @@ static int virtballoon_probe(struct virtio_device *vd= ev) goto out_unregister_oom; } =20 + vb->pr_dev_info.order =3D PAGE_REPORTING_DEFAULT_ORDER; + /* * The default page reporting order is @pageblock_order, which * corresponds to 512MB in size on ARM64 when 64KB base page --=20 2.34.1 From nobody Tue Apr 7 18:51:32 2026 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4A092423164 for ; Fri, 27 Feb 2026 14:07:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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[129.46.96.20]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-7d5866269a8sm4324502a34.13.2026.02.27.06.07.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 Feb 2026 06:07:04 -0800 (PST) From: Yuvraj Sakshith To: akpm@linux-foundation.org Cc: mst@redhat.com, david@kernel.org, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, longli@microsoft.com, jasowang@redhat.com, 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, linux-hyperv@vger.kernel.org, virtualization@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v1 3/4] hv_balloon: set default page reporting order Date: Fri, 27 Feb 2026 06:06:54 -0800 Message-Id: <20260227140655.360696-4-yuvraj.sakshith@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260227140655.360696-1-yuvraj.sakshith@oss.qualcomm.com> References: <20260227140655.360696-1-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-Proofpoint-ORIG-GUID: d5RabFMwdpzqUTVHiTBtTYvNY_6FT9tX X-Proofpoint-GUID: d5RabFMwdpzqUTVHiTBtTYvNY_6FT9tX X-Authority-Analysis: v=2.4 cv=DOqCIiNb c=1 sm=1 tr=0 ts=69a1a50a cx=c_pps a=OI0sxtj7PyCX9F1bxD/puw==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=HzLeVaNsDn8A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=eoimf2acIAo5FJnRuUoq:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=yAl3Rinrq36N4FMOn3wA:9 a=Z1Yy7GAxqfX1iEi80vsk:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjI3MDEyNSBTYWx0ZWRfX/0XrYnuKnV4U vMYgYb+57muh2pf0/0t1PDIz794iG7d/xnT+qlaHrynKoj9ZTJVocim16NCD+KUSiM2W4o+qa7J OoZpS/HkhaK3+WGftgxdRa34mkrqFBo1qJcIlZ/Yw2Wi0WIll0v5XfRLs0J1VbOjt6+essWl3QF D3u0kmDfx/h/8t9LcsMTVVZPjdjGvcPt1vUuN2RePBvCHPma4GTHItD/LCJDqmjJCUZOV3D3NNI 4imAiJzCpM/Infz8D1DOxyDnQIBjOUodDU40rEalUAfuYQF4Jz6iammcDSa8Pki7q5YoyeCPML/ IGOF5NdIdgY2stgTkvlwMLamLMfV+jSVrqyPgOPVn9MJtcI8qHaKZoag21Wk60sZ/qp4mVLlAj1 /JzAlOjpd8Ol2k/fpIIqVUVw9Gtch+0qNAI+efeO1I2yzpxC71DwwdY6bx5oiMaLdHfETh4YPOv qm1Q8x8BFJN/Bl0jDSw== 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=2026-02-27_02,2026-02-27_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 phishscore=0 malwarescore=0 adultscore=0 priorityscore=1501 clxscore=1015 suspectscore=0 impostorscore=0 lowpriorityscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2602270125 Content-Type: text/plain; charset="utf-8" Explicitly mention page reporting order to be set to default value using PAGE_REPORTING_DEFAULT_ORDER fallback value. Reviewed-by: David Hildenbrand (Arm) Signed-off-by: Yuvraj Sakshith --- drivers/hv/hv_balloon.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c index 2b4080e51..3d6bd9936 100644 --- a/drivers/hv/hv_balloon.c +++ b/drivers/hv/hv_balloon.c @@ -1663,7 +1663,7 @@ static void enable_page_reporting(void) * We let the page_reporting_order parameter decide the order * in the page_reporting code */ - dm_device.pr_dev_info.order =3D 0; + dm_device.pr_dev_info.order =3D PAGE_REPORTING_DEFAULT_ORDER; ret =3D page_reporting_register(&dm_device.pr_dev_info); if (ret < 0) { dm_device.pr_dev_info.report =3D NULL; --=20 2.34.1 From nobody Tue Apr 7 18:51:32 2026 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1FDE6423A8B for ; Fri, 27 Feb 2026 14:07:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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[129.46.96.20]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-7d5866269a8sm4324502a34.13.2026.02.27.06.07.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 Feb 2026 06:07:06 -0800 (PST) From: Yuvraj Sakshith To: akpm@linux-foundation.org Cc: mst@redhat.com, david@kernel.org, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, longli@microsoft.com, jasowang@redhat.com, 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, linux-hyperv@vger.kernel.org, virtualization@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v1 4/4] page_reporting: change PAGE_REPORTING_DEFAULT_ORDER to -1 Date: Fri, 27 Feb 2026 06:06:55 -0800 Message-Id: <20260227140655.360696-5-yuvraj.sakshith@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260227140655.360696-1-yuvraj.sakshith@oss.qualcomm.com> References: <20260227140655.360696-1-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-Proofpoint-ORIG-GUID: zFKLYg6ZTISr_M4_YRRtwDsUWTMfv_iC X-Authority-Analysis: v=2.4 cv=Vtouwu2n c=1 sm=1 tr=0 ts=69a1a50c cx=c_pps a=+3WqYijBVYhDct2f5Fivkw==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=HzLeVaNsDn8A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_K5XuSEh1TEqbUxoQ0s3:22 a=EUspDBNiAAAA:8 a=6q7Fjfde3VlTRWJJNBIA:9 a=eYe2g0i6gJ5uXG_o6N4q:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjI3MDEyNSBTYWx0ZWRfX0wPIKAV8wDpt yn1nJ0zdR5DBxYhtZBr24w+I5/m09LHjoR9MK73+YU4ofiPOs+l3l7q3tiWB2euUNMsZNXjWgYE uEuwPy+z3+9EuGj/ASEH79X+qE9ue3pKtX4QVB5tpzAxzhdknwfkwjZqSiVdY1PlsbKIwHcLuvW +IacMUAmLa331GUMiK/dpxh3B5CD9xaoINzyKcGlVjdIa9bHhhct3S9JozSI2WpAcgi1cXzC9S/ jXKeWDzeQgw6TMS4TyzDZybaw538LbENd7qPW7OH/gUA0wUv6dslm+T9E5QrY4lkaEgwdxEIdfe INQwu/EMnKrr1O9CwMlq8YeZaU12OluEEKN51ECd0r5iwDopNB3xHiREaf5OXG+DfPgb53Gls+w xZkEKwhHo9NkpIio4Dw23+vKkCQiAyQE6wO8WOstGDnZmNw/YOLiymwEapqbKfft8kB1nK6gX48 Tdec2jr8iLL67lf3eMQ== X-Proofpoint-GUID: zFKLYg6ZTISr_M4_YRRtwDsUWTMfv_iC 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=2026-02-27_02,2026-02-27_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 clxscore=1015 phishscore=0 bulkscore=0 spamscore=0 impostorscore=0 suspectscore=0 adultscore=0 malwarescore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2602270125 Content-Type: text/plain; charset="utf-8" PAGE_REPORTING_DEFAULT_ORDER is now set to zero. This means, pages of order zero cannot be reported to a client/driver -- as zero is used to signal a fallback to MAX_PAGE_ORDER. Change PAGE_REPORTING_DEFAULT_ORDER to (-1), so that zero can be used as a valid order with which pages can be reported. Signed-off-by: Yuvraj Sakshith --- include/linux/page_reporting.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/page_reporting.h b/include/linux/page_reporting.h index a7e3e30f2..3eb3e26d8 100644 --- a/include/linux/page_reporting.h +++ b/include/linux/page_reporting.h @@ -7,7 +7,7 @@ =20 /* This value should always be a power of 2, see page_reporting_cycle() */ #define PAGE_REPORTING_CAPACITY 32 -#define PAGE_REPORTING_DEFAULT_ORDER 0 +#define PAGE_REPORTING_DEFAULT_ORDER (-1) =20 struct page_reporting_dev_info { /* function that alters pages to make them "reported" */ --=20 2.34.1