linux-kernel - Re: [PATCH] net:Kconfig: drop no sense dependence entry for BONDING

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Date:	Thu, 12 Mar 2015 16:14:15 +0100
From:	Martin Walch <walch.martin@....de>
To:	Wang YanQing <udknight@...il.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
	j.vosburgh@...il.com, vfalico@...il.com, gospo@...ulusnetworks.com,
	Erik Hugne <erik.hugne@...csson.com>
Subject: Re: [PATCH] net:Kconfig: drop no sense dependence entry for BONDING

On Thursday 12 March 2015 21:59:33 Wang YanQing wrote:
> "IPV6 || IPV6=n" means no dependence!

IPV6 and BONDING are both tristate symbols and therefore this is not the same
as no dependency. When setting IPV6 to m, the expression evaluates to

"IPV6 || IPV6=n" 
"m || m=n"
"m || n"
"m"

So, if IPV6=m, then BONDING can only be n or m, but not y.

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