Xen devel - Jun 2008 - problem with netback netif copying_receiver flag

hi,
I''m confused with  !! when setting netback rx_copy flag.
be->netif->copying_receiver = !!rx_copy
here why use !! ?

why not just
be->netif->copying_receiver = rx_copy

thanks in advance!

Zang Hongyong
zanghongyong@ncic.ac.cn
2008-06-02


_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel

Just in case rx_copy has a value other than 0 or 1. Since it''s read
from
xenstore it seemed worth sanitising it. It''s not really very important
or
strictly necessary.

 -- Keir

On 2/6/08 09:50, "Zang Hongyong" <zanghongyong@ncic.ac.cn>
wrote:
> hi,
> I''m confused with  !! when setting netback rx_copy flag.
> be->netif->copying_receiver = !!rx_copy
> here why use !! ?
> 
> why not just
> be->netif->copying_receiver = rx_copy
> 
> thanks in advance!
> 
> Zang Hongyong
> zanghongyong@ncic.ac.cn
> 2008-06-02
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel


_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel