netdev - RE: [PATCH] xfrm: optimize ipv4 selector matching

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Message-ID: <AE90C24D6B3A694183C094C60CF0A2F6D8AED9@saturn3.aculab.com>
Date:	Tue, 22 Nov 2011 15:15:25 -0000
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Eric Dumazet" <eric.dumazet@...il.com>,
	"Alexey Dobriyan" <adobriyan@...il.com>
Cc:	<davem@...emloft.net>, <netdev@...r.kernel.org>
Subject: RE: [PATCH] xfrm: optimize ipv4 selector matching

 
> Please use :
> 
> +static inline bool addr4_match(__be32 a1, __be32 a2, u8 prefixlen)
> +{
> +       /* C99 6.5.7 (3): u32 << 32 is undefined behaviour */
> +       if (prefixlen == 0)
> +               return true;
> +       return !((a1 ^ a2) & htonl(0xFFFFFFFFu << (32 - prefixlen)));
> +}

I'm not sure I'd agree about using 'u8'.
It may well cause an unnecessary mask with 0xff.

	David


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