linux-kernel - Re: [PATCH 46/62] usb: Use static const

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Date:	Sun, 21 Nov 2010 17:06:53 +0300
From:	Sergei Shtylyov <sshtylyov@...sta.com>
To:	Joe Perches <joe@...ches.com>
CC:	Jan Dumon <j.dumon@...ion.com>,
	Greg Kroah-Hartman <gregkh@...e.de>, linux-usb@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 46/62] usb: Use static const

Hello.

On 21-11-2010 5:38, Joe Perches wrote:

> Using static const generally increases object text and decreases data size.
> It also generally decreases overall object size.

>     text	   data	    bss	    dec	    hex	filename
>    36120	    312	   9000	  45432	   b178	drivers/net/usb/hso.o.old
>    36043	    312	   9008	  45363	   b133	drivers/net/usb/hso.o.new

> Consolidate duplicated code into new fix_crc_bug function
> and declare data in that function static const.

> Signed-off-by: Joe Perches<joe@...ches.com>
[...]

> diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
> index be8cc2a..c77d0ea 100644
> --- a/drivers/net/usb/hso.c
> +++ b/drivers/net/usb/hso.c
> @@ -1001,6 +1001,18 @@ static void packetizeRx(struct hso_net *odev, unsigned char *ip_pkt,
>   	}
>   }
>
> +static void fix_crc_bug(struct urb *urb, __le16 max_packet_size)
> +{
> +	static const u8 crc_check[4] = { 0xDE, 0xAD, 0xBE, 0xEF };
> +	u32 rest = urb->actual_length % le16_to_cpu(max_packet_size);
> +
> +	if (((rest == 5) || (rest == 6)) &&
> +	    !memcmp(((u8 *)urb->transfer_buffer) + urb->actual_length - 4,

    Parens around '(u8 *)urb->transfer_buffer' not needed. Could get rid of 
them, while at it...

> +		    crc_check, 4)) {
> +		urb->actual_length -= 4;
> +	}
> +}
> +
>   /* Moving data from usb to kernel (in interrupt state) */
>   static void read_bulk_callback(struct urb *urb)
>   {

WBR, Sergei
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