[PATCH 4.14 05/39] drm/virtio: use kvmalloc for large allocations

[Greg Kroah-Hartman]

From: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>

commit ea86f3defd55f141a44146e66cbf8ffb683d60da upstream.

We observed that some of virtio_gpu_object_shmem_init() allocations
can be rather costly - order 6 - which can be difficult to fulfill
under memory pressure conditions. Switch to kvmalloc_array() in
virtio_gpu_object_shmem_init() and let the kernel vmalloc the entries
array.

Signed-off-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Link: http://patchwork.freedesktop.org/patch/msgid/20201105014744.1662226-1-senozhatsky@xxxxxxxxxxxx
Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Signed-off-by: Doug Horn <doughorn@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/virtio/virtgpu_vq.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -865,9 +865,9 @@ int virtio_gpu_object_attach(struct virt
 	}
 
 	/* gets freed when the ring has consumed it */
-	ents = kmalloc_array(obj->pages->nents,
-			     sizeof(struct virtio_gpu_mem_entry),
-			     GFP_KERNEL);
+	ents = kvmalloc_array(obj->pages->nents,
+			      sizeof(struct virtio_gpu_mem_entry),
+			      GFP_KERNEL);
 	if (!ents) {
 		DRM_ERROR("failed to allocate ent list\n");
 		return -ENOMEM;