linux-kernel - Re: dead CONFIG_ variables: net/ipv4/

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Message-Id: <20070529.131013.97289989.davem@davemloft.net>
Date:	Tue, 29 May 2007 13:10:13 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	rpjday@...dspring.com
Cc:	linux-kernel@...r.kernel.org
Subject: Re: dead CONFIG_ variables: net/ipv4/

From: "Robert P. J. Day" <rpjday@...dspring.com>
Date: Wed, 2 May 2007 17:15:01 -0400 (EDT)

> 
>   again, this list contains some CONFIG_ variables that aren't
> technically dead, but *really* should be renamed to not be confused
> with Kconfig variables.  there are, however, legitimately dead ones in
> the following in places:
> 
> $ ../dead_config.sh net/ipv4
> ========== IP_FIB_TRIE_STATS ==========
> net/ipv4/fib_trie.c:#undef CONFIG_IP_FIB_TRIE_STATS
> net/ipv4/fib_trie.c:#ifdef CONFIG_IP_FIB_TRIE_STATS
> net/ipv4/fib_trie.c:#ifdef CONFIG_IP_FIB_TRIE_STATS
> net/ipv4/fib_trie.c:#ifdef CONFIG_IP_FIB_TRIE_STATS
> net/ipv4/fib_trie.c:#ifdef CONFIG_IP_FIB_TRIE_STATS
> net/ipv4/fib_trie.c:#ifdef CONFIG_IP_FIB_TRIE_STATS
> net/ipv4/fib_trie.c:#ifdef CONFIG_IP_FIB_TRIE_STATS
> net/ipv4/fib_trie.c:#ifdef CONFIG_IP_FIB_TRIE_STATS
> net/ipv4/fib_trie.c:#ifdef CONFIG_IP_FIB_TRIE_STATS
> net/ipv4/fib_trie.c:#ifdef CONFIG_IP_FIB_TRIE_STATS
> net/ipv4/fib_trie.c:#ifdef CONFIG_IP_FIB_TRIE_STATS
> net/ipv4/fib_trie.c:#ifdef CONFIG_IP_FIB_TRIE_STATS
> net/ipv4/fib_trie.c:#endif /*  CONFIG_IP_FIB_TRIE_STATS */

Robert Olsson uses this for statistics collection by turning
that #undef there into a #define and other developers could
use this too.

Therefore I'm reluctant to remove this for now.

> ========== IP_NOSIOCRT ==========
> net/ipv4/fib_frontend.c:#ifndef CONFIG_IP_NOSIOCRT

Definitely bogus, deleted.

> ========== IP_PIMSM ==========
> net/ipv4/ipmr.c:#define CONFIG_IP_PIMSM 1

This one isn't bogus, it is a shorthand and is set when
either CONFIG_IP_PIMSM_V1 or CONFIG_IP_PIMSM_V2 are set.

> ========== IP_ROUTE_PERVASIVE ==========
> net/ipv4/fib_semantics.c:#ifdef CONFIG_IP_ROUTE_PERVASIVE

This seems to be for an intended feature to allow control of
recursive gateway lookups, I'm not touching this one :-)
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