linux-kernel - [PATCH 5.10 004/102] drm/virtio: use kvmalloc for large allocations

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Message-Id: <20210305120903.495591839@linuxfoundation.org>
Date:   Fri,  5 Mar 2021 13:20:23 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Doug Horn <doughorn@...gle.com>
Subject: [PATCH 5.10 004/102] drm/virtio: use kvmalloc for large allocations

From: Sergey Senozhatsky <senozhatsky@...omium.org>

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@...omium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20201105014744.1662226-1-senozhatsky@chromium.org
Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
Signed-off-by: Doug Horn <doughorn@...gle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/virtio/virtgpu_object.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/virtio/virtgpu_object.c
+++ b/drivers/gpu/drm/virtio/virtgpu_object.c
@@ -172,8 +172,9 @@ static int virtio_gpu_object_shmem_init(
 		*nents = shmem->pages->orig_nents;
 	}
 
-	*ents = kmalloc_array(*nents, sizeof(struct virtio_gpu_mem_entry),
-			      GFP_KERNEL);
+	*ents = kvmalloc_array(*nents,
+			       sizeof(struct virtio_gpu_mem_entry),
+			       GFP_KERNEL);
 	if (!(*ents)) {
 		DRM_ERROR("failed to allocate ent list\n");
 		return -ENOMEM;