Error in building own kernel

1. If you are running this on Ubuntu 21.10, then "disco" does not make sense.
Ubuntu disco was release 19.04 which is not supported any more.
Ubuntu 21.10 is named "impish".

2. The real error is not shown in your snippet. Please show the first line from your log that contains "error:" and a few lines before and after.

Hi M-hampl,
Thanks for reply.
As per your suggestion we can share the full error message as below.

 CC [M] net/netfilter/xt_osf.o
  CC [M] net/netfilter/xt_owner.o
  CC [M] net/netfilter/xt_cgroup.o
  CC [M] net/netfilter/xt_physdev.o
  CC [M] net/netfilter/xt_pkttype.o
  CC [M] net/netfilter/xt_policy.o
  CC [M] net/netfilter/xt_quota.o
  CC [M] net/netfilter/xt_rateest.o
  LD [M] net/wireless/cfg80211.o
  CC [M] net/netfilter/xt_realm.o
  CC [M] net/netfilter/xt_recent.o
  CC [M] net/netfilter/xt_sctp.o
  CC [M] net/netfilter/xt_socket.o
  CC [M] net/netfilter/xt_state.o
  CC [M] net/netfilter/xt_statistic.o
  CC [M] net/netfilter/xt_string.o
  CC [M] net/netfilter/xt_tcpmss.o
  CC [M] net/netfilter/xt_time.o
  CC [M] net/netfilter/xt_u32.o
  AR net/netfilter/built-in.a
  LD [M] net/netfilter/nf_conntrack.o
  LD [M] net/netfilter/nf_conntrack_h323.o
  LD [M] net/netfilter/nf_nat.o
  LD [M] net/netfilter/nf_tables.o
  LD [M] net/netfilter/nf_tables_set.o
  LD [M] net/netfilter/nf_flow_table.o
  AR net/built-in.a
make[2]: Leaving directory '/home/embed/workspace/Intel_3930/custom4/disco/debian/build/build-generic'
make[1]: *** [Makefile:173: sub-make] Error 2
make[1]: Leaving directory '/home/embed/workspace/Intel_3930/custom4/disco'
make: *** [debian/rules.d/2-binary-arch.mk:50: /home/embed/workspace/Intel_3930/custom4/disco/debian/stamps/stamp-build-generic] Error 2

Thanks and Regarding
           Ajay

It still says "disco"

Hi M-hampl,
Thanks so much for quick reply.
I have another question this disco kernel package supports for Intel atom X5-3930 processor ?
if not then please provide the supported kernel source information and also customisation of the kernel source is possible.

Thanks once again for help.

Regarding and Thanks
    Ajay

Thanks Manfred Hampl, that solved my question.