netdev - Re: [PATCH 1/1] net/hyperv: Add flow control based on hi/low watermark

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Date:	Tue, 27 Mar 2012 15:20:45 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Haiyang Zhang <haiyangz@...rosoft.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	devel@...uxdriverproject.org, olaf@...fle.de,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] net/hyperv: Add flow control based on hi/low
 watermark

On Tue, Mar 27, 2012 at 03:23:07PM -0700, Haiyang Zhang wrote:
> --- a/include/linux/hyperv.h
> +++ b/include/linux/hyperv.h
> @@ -274,6 +274,35 @@ struct hv_ring_buffer_debug_info {
>  	u32 bytes_avail_towrite;
>  };
>  
> +/* Amount of space to write to */
> +#define BYTES_AVAIL_TO_WRITE(r, w, z) \
> +	(((w) >= (r)) ? ((z) - ((w) - (r))) : ((r) - (w)))
> +

That's a very bad #define to use in a .h file, please do not do that.

> +
> +/*
> + *
> + * hv_get_ringbuffer_availbytes()
> + *
> + * Get number of bytes available to read and to write to
> + * for the specified ring buffer
> + */
> +extern inline void
> +hv_get_ringbuffer_availbytes(struct hv_ring_buffer_info *rbi,
> +			  u32 *read, u32 *write)

What does "extern inline" mean?

Please fix.

greg k-h
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