Compilation aborts with
fs/proc/proc_net.c:254:48: error: constified variable ‘proc_net_ns_ops’ placed into writable section ".init.data"
static struct pernet_operations __net_initdata proc_net_ns_ops = {
^
scripts/Makefile.build:258: recipe for target 'fs/proc/proc_net.o' failed
It happens with gcc (Debian 5.4.0-4) 5.4.0 20160609.