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

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Date:	Fri, 24 Apr 2015 13:29:17 -0700
From:	Joe Perches <joe@...ches.com>
To:	sixiao@...rosoft.com
Cc:	kys@...rosoft.com, haiyangz@...rosoft.com,
	devel@...uxdriverproject.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next,v2,1/1] hv_netvsc: introduce netif-msg into
 netvsc module

On Fri, 2015-04-24 at 11:34 -0700, sixiao@...rosoft.com wrote:
> From: Simon Xiao <sixiao@...rosoft.com>
> 
> 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);



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