NR_CPUS parameter pin in config

Hello! We have an issue on platform with two AMD EPYC 9654 96-Core Processor on ArchLinux (SMT enable, 384 threads).

The problem is that lscpu does not display all threads.

root@archlinux ~ # lscpu
Architecture:            x86_64
  CPU op-mode(s):        32-bit, 64-bit
  Address sizes:         52 bits physical, 57 bits virtual
  Byte Order:            Little Endian
CPU(s):                  320
  On-line CPU(s) list:   0-319

NUMA:                    
  NUMA node(s):          2
  NUMA node0 CPU(s):     0-95,192-287
  NUMA node1 CPU(s):     96-191,288-319

While investigating the problem, we found the NR-CPUS parameter pin to be 320 threads. This value now is hardcoded in linux config file.

root@archlinux ~ # uname -r
6.11.6-arch1-1
root@archlinux ~ # zgrep -w CONFIG_NR_CPUS /proc/config.gz  
CONFIG_NR_CPUS=320
root@archlinux ~ #

Other linux distributions such as Ubuntu do not have this problem:

root@HWDEV-645-4GEN-AMD:~# lscpu
Architecture:                       x86_64
CPU op-mode(s):                     32-bit, 64-bit
Byte Order:                         Little Endian
Address sizes:                      52 bits physical, 57 bits virtual
CPU(s):                             384
On-line CPU(s) list:                0-383


NUMA node0 CPU(s):                  0-95,192-287
NUMA node1 CPU(s):                  96-191,288-383

Please, raise the value of this parameter, or bring it to the view of the original configuration.

Otherwise, please describe the reason why only 320 cores are possible now.