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Commit 1fed17df authored by Dexuan Cui's avatar Dexuan Cui Committed by Sasha Levin
Browse files

hv_balloon: Use a static page for the balloon_up send buffer 



It's unnecessary to dynamically allocate the buffer.

Signed-off-by: default avatarDexuan Cui <decui@microsoft.com>
Reviewed-by: default avatarMichael Kelley <mikelley@microsoft.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 5f9e832c

drivers/hv/hv_balloon.c

+4 −15
Original line number Diff line number Diff line
@@ -494,7 +494,7 @@ enum hv_dm_state { 




static __u8 recv_buffer[PAGE_SIZE];

static __u8 *send_buffer;

static __u8 balloon_up_send_buffer[PAGE_SIZE];

#define PAGES_IN_2M	512

#define HA_CHUNK (32 * 1024)
@@ -1292,8 +1292,8 @@ static void balloon_up(struct work_struct *dummy) 
	}



	while (!done) {

		bl_resp = (struct dm_balloon_response *)send_buffer;

		memset(send_buffer, 0, PAGE_SIZE);

		memset(balloon_up_send_buffer, 0, PAGE_SIZE);

		bl_resp = (struct dm_balloon_response *)balloon_up_send_buffer;

		bl_resp->hdr.type = DM_BALLOON_RESPONSE;

		bl_resp->hdr.size = sizeof(struct dm_balloon_response);

		bl_resp->more_pages = 1;
@@ -1578,19 +1578,11 @@ static int balloon_probe(struct hv_device *dev, 
	do_hot_add = false;

#endif



	/*

	 * First allocate a send buffer.

	 */



	send_buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);

	if (!send_buffer)

		return -ENOMEM;



	ret = vmbus_open(dev->channel, dm_ring_size, dm_ring_size, NULL, 0,

			balloon_onchannelcallback, dev);



	if (ret)

		goto probe_error0;

		return ret;



	dm_device.dev = dev;

	dm_device.state = DM_INITIALIZING;
@@ -1716,8 +1708,6 @@ static int balloon_probe(struct hv_device *dev, 


probe_error1:

	vmbus_close(dev->channel);

probe_error0:

	kfree(send_buffer);

	return ret;

}
@@ -1736,7 +1726,6 @@ static int balloon_remove(struct hv_device *dev) 


	vmbus_close(dev->channel);

	kthread_stop(dm->thread);

	kfree(send_buffer);

#ifdef CONFIG_MEMORY_HOTPLUG

	restore_online_page_callback(&hv_online_page);

	unregister_memory_notifier(&hv_memory_nb);