netdev - Re: [PATCH net-next v2 3/3] net: bridge: export supported boolopts

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Message-ID: <20181124161647.GB24681@lunn.ch>
Date:   Sat, 24 Nov 2018 17:16:47 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Cc:     netdev@...r.kernel.org, roopa@...ulusnetworks.com,
        davem@...emloft.net, bridge@...ts.linux-foundation.org
Subject: Re: [PATCH net-next v2 3/3] net: bridge: export supported boolopts

On Sat, Nov 24, 2018 at 04:34:22AM +0200, Nikolay Aleksandrov wrote:
> Now that we have at least one bool option, we can export all of the
> supported bool options via optmask when dumping them.
> 
Hi Nik

That answers my question then...

I'm assuming this means there is no easy way to generate a bitmask of
0? So you waited until there was at least one bit.

(1 << 2) - 1 = 3
(1 << 1) - 1 = 1
(1 << 0) - 1 = 0

So does 

GENMASK((BR_BOOLOPT_MAX - 1), 0);

really not do the right thing when BR_BOOLOPT_MAX = 1?

       Andrew