netdev - Re: [PATCH net-next] Revert "ipv4: make net

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Date:   Tue, 29 Aug 2017 10:47:15 -0600
From:   David Ahern <dsahern@...il.com>
To:     Bhumika Goyal <bhumirks@...il.com>
Cc:     netdev@...r.kernel.org, David Miller <davem@...emloft.net>
Subject: Re: [PATCH net-next] Revert "ipv4: make net_protocol const"

On 8/29/17 12:46 AM, Bhumika Goyal wrote:
> I am compile testing them. In this case I did:  make
> net/ipv4/af_inet.o and it compiled. Is this error because of
> typecasting net_protocol inside inet_add_protocol function?

Compile testing is not sufficient. Marking data structures read-only
leaves potential land mines for others to trip over at run-time.

You are making these changes based on a code analysis. Extend the
analysis to elements of the structure. In this case early_demux is the
first element. There are only 9 references to early_demux and cscope
very quickly tells you it can be changed:

7 sysctl_net_ipv4.c proc_configure_early_demux  312 ipprot->early_demux
= enabled ? ipprot->early_demux_handler :
8 sysctl_net_ipv4.c proc_configure_early_demux  318 ip6prot->early_demux
= enabled ? ip6prot->early_demux_handler :