Subject: Re: [PATCH net-next,v2,1/1] hv_netvsc: introduce netif-msg into netvsc module

From: Joe Perches <[email-masked]>
Date: Fri, 24 Apr 2015 13:29:17 -0700

On Fri, 2015-04-24 at 11:34 -0700, [email-masked] wrote:
> From: Simon Xiao <[email-masked]>
> 
> 1. Introduce netif-msg to netvsc to control debug logging output
> and keep msg_enable in netvsc_device_context so that it is
> kept persistently.
> 2. Only call dump_rndis_message() when NETIF_MSG_RX_ERR or above
> is specified in netvsc module debug param.
> In non-debug mode, in current code, dump_rndis_message() will not
> dump anything but it still initialize some local variables and
> process the switch logic which is unnecessary, especially in
> high network throughput situation.

[]

> diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
[]
> @@ -888,6 +891,11 @@ static int netvsc_probe(struct hv_device *dev,
>  
>  	net_device_ctx = netdev_priv(net);
>  	net_device_ctx->device_ctx = dev;
> +	net_device_ctx->msg_enable = netif_msg_init(debug, default_msg);
> +	if (netif_msg_probe(net_device_ctx))
> +		netdev_dbg(net, "netvsc msg_enable: %d",
> +			   net_device_ctx->msg_enable);

Please use newlines to terminate formats.

It helps prevent log content interleaving when multiple processes
are emitting output at the same time.

This could be shortened to use netif_<level> like:

	netif_dbg(net_device_ctx, probe, net, "netvsc_msg_enable: %d\n",
		  net_device_ctx->msg_enable);