just put the line 
swap    /ramfs  mfs     rw,nodev,nosuid,-s=300m 0       0
into /etc/fstab (-s means size) 
and run 
# mount /ramfs

On Sun, Sep 05, 2021 at 07:59:26AM +0000, iio7 wrote:
> # mount -t tmpfs tmpfs /home/foo/tmp/
> mount_tmpfs: tmpfs on /home/foo/tmp: Operation not supported
> 
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