netdev - Re: [PATCH RFC] ipv6: use stronger hash for reassembly queue hash table

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Date:	Wed, 13 Mar 2013 21:36:52 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org,
	yoshfuji@...ux-ipv6.org, brouer@...hat.com
Subject: Re: [PATCH RFC] ipv6: use stronger hash for reassembly queue hash table

> +#define INET_FRAG_FIND_CHECK(val)                                      \
> +       ({                                                              \
> +               static const char ___mem[] =                            \
> +                       KERN_ERR pr_fmt(                                \
> +                               "inet_frag_find: No memory left."       \
> +                               " Dropping fragment.\n");               \
> +               static const char ___limit[] =                          \
> +                       KERN_WARNING pr_fmt(                            \
> +                               "inet_frag_find: Fragment hash bucket"  \
> +                               " list length grew above limit "        \
> +                               __stringify(INETFRAGS_MAXDEPTH)         \
> +                               ". Dropping fragment.\n");              \
> +               bool ___b = true;                                       \
> +               if (IS_ERR_OR_NULL(val)) {                              \
> +                       ___b = false;                                   \
> +                       if (PTR_ERR(val) == -ENOBUFS)                   \
> +                               LIMIT_NETDEBUG(___limit);               \
> +                       else                                            \
> +                               LIMIT_NETDEBUG(___mem);                 \
> +               }                                                       \
> +               ___b;                                                   \
> +       })
> +

Big macros suck, write it as an inline function or better yet a real function.
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