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Message-ID: <20230713145551.2824980-3-david@redhat.com>
Date: Thu, 13 Jul 2023 16:55:49 +0200
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org, virtualization@...ts.linux-foundation.org,
David Hildenbrand <david@...hat.com>,
"Michael S. Tsirkin" <mst@...hat.com>,
Jason Wang <jasowang@...hat.com>,
Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Subject: [PATCH v1 2/4] virtio-mem: convert most offline_and_remove_memory() errors to -EBUSY
Just like we do with alloc_contig_range(), let's convert all unknown
errors to -EBUSY, but WARN so we can look into the issue. For example,
offline_pages() could fail with -EINTR, which would be unexpected in our
case.
Signed-off-by: David Hildenbrand <david@...hat.com>
---
drivers/virtio/virtio_mem.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c
index ed15d2a4bd96..1a76ba2bc118 100644
--- a/drivers/virtio/virtio_mem.c
+++ b/drivers/virtio/virtio_mem.c
@@ -741,11 +741,15 @@ static int virtio_mem_offline_and_remove_memory(struct virtio_mem *vm,
* immediately instead of waiting.
*/
virtio_mem_retry(vm);
- } else {
- dev_dbg(&vm->vdev->dev,
- "offlining and removing memory failed: %d\n", rc);
+ return 0;
}
- return rc;
+ dev_dbg(&vm->vdev->dev, "offlining and removing memory failed: %d\n", rc);
+ /*
+ * We don't really expect this to fail, because we fake-offlined all
+ * memory already. But it could fail in corner cases.
+ */
+ WARN_ON_ONCE(rc != -ENOMEM && rc != -EBUSY);
+ return rc == -ENOMEM ? -ENOMEM : -EBUSY;
}
/*
--
2.41.0
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