netdev - Re: [PATCH RFC net-next 18/18] net/ipv4: Optimization for fib

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Message-ID: <20180901134334.5fc199fb@xeon-e3>
Date:   Sat, 1 Sep 2018 13:43:34 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     dsahern@...nel.org
Cc:     netdev@...r.kernel.org, roopa@...ulusnetworks.com,
        sharpd@...ulusnetworks.com, idosch@...lanox.com,
        davem@...emloft.net, David Ahern <dsahern@...il.com>
Subject: Re: [PATCH RFC net-next 18/18] net/ipv4: Optimization for fib_info
 lookup

On Fri, 31 Aug 2018 17:49:53 -0700
dsahern@...nel.org wrote:

> +static inline unsigned int fib_info_hashfn_cfg(const struct fib_config *cfg)
> +{
> +	unsigned int mask = (fib_info_hash_size - 1);
> +	unsigned int val = 0;
> +
> +	val ^= (cfg->fc_protocol << 8) | cfg->fc_scope;

Why do assignment to 0 than do initial xor?
Why not instead just do assignment in the first statement which would be clearer.