Re: [PATCH] tcp_memcontrol: Forward declare cgroup_subsys and mem_cgroup stucts

From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: Sun, 17 Jan 2016 11:30:37 +0100

In file included from net/ipv4/tcp_ipv4.c:77 (and many more):
include/net/tcp_memcontrol.h:5: warning: ‘struct cgroup_subsys’ declared inside parameter list
include/net/tcp_memcontrol.h:5: warning: its scope is only this definition or declaration, which is probably not what you want

Add forward declarations for all used structures to fix this.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

Applied, thanks Geert.