linux-kernel - Re: [PATCH 1/3] virtio_console:Merge struct buffer_token into struct port

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Message-ID: <5062CD93.8090600@hitachi.com>
Date:	Wed, 26 Sep 2012 18:40:35 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Sjur BRENDELAND <sjur.brandeland@...ricsson.com>
Cc:	Amit Shah <amit.shah@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"virtualization@...ts.linux-foundation.org" 
	<virtualization@...ts.linux-foundation.org>,
	"sjurbren@...il.com" <sjurbren@...il.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	"yrl.pp-manager.tt@...achi.com" <yrl.pp-manager.tt@...achi.com>
Subject: Re: [PATCH 1/3] virtio_console:Merge struct buffer_token into struct
 port_buffer

(2012/09/26 16:48), Sjur BRENDELAND wrote:
>>> -static struct port_buffer *alloc_buf(size_t buf_size)
>>> +static struct port_buffer *alloc_buf(struct virtqueue *vq, size_t buf_size,
>>> +				     int nrbufs)
>>>  {
>>>  	struct port_buffer *buf;
>>> +	size_t alloc_size;
>>>
>>> -	buf = kmalloc(sizeof(*buf), GFP_KERNEL);
>>> +	/* Allocate buffer and the scatter list */
>>> +	alloc_size = sizeof(*buf) + sizeof(struct scatterlist) * nrbufs;
>>
>> This allocates one redundant sg entry when nrbuf > 0,
>> but I think it is OK. (just a comment)
> 
> I did this on purpose for the sake of simplicity, but I can
> change this to something like:
> 	 alloc_size = sizeof(*buf) + sizeof(buf->sg) * max(nrbufs - 1, 1);

You wouldn't need to change that. I think current code is enough simple
and reasonable. :)

Thanks!

-- 
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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