From: Yuvraj Sakshith <yuvraj.sakshith@oss.qualcomm.com>
Date: Tue, 3 Mar 2026 11:30:29 +0000 (-0800)
Subject: virtio_balloon: set unspecified page reporting order
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=f2325daa3a37502156a761cc5c3cc497eb3b0f4c;p=thirdparty%2Flinux.git

virtio_balloon: set unspecified page reporting order

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_ORDER_UNSPECIFIED fallback value.

Link: https://lkml.kernel.org/r/20260303113032.3008371-3-yuvraj.sakshith@oss.qualcomm.com
Signed-off-by: Yuvraj Sakshith <yuvraj.sakshith@oss.qualcomm.com>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Cc: Brendan Jackman <jackmanb@google.com>
Cc: Dexuan Cui <decui@microsoft.com>
Cc: Eugenio Pérez <eperezma@redhat.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Long Li <longli@microsoft.com>
Cc: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Wei Liu <wei.liu@kernel.org>
Cc: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index 7f15bf162e88b..f6c2dff33f8af 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -1022,6 +1022,8 @@ static int virtballoon_probe(struct virtio_device *vdev)
 			goto out_unregister_oom;
 		}
 
+		vb->pr_dev_info.order = PAGE_REPORTING_ORDER_UNSPECIFIED;
+
 		/*
 		 * The default page reporting order is @pageblock_order, which
 		 * corresponds to 512MB in size on ARM64 when 64KB base page