passing __user function parameter from kernel_module result in EFAULT

Hi all, I am trying to do a mount from kernel module in kernel 5.4 on x86_64. It fails with -14, I tried to set_fs(USER_DS) before calling do_mount but it did not help. do_mount() returns -EFAUTL when it checks filename validity just at the very first lines of do_mount (). Are there other tricks to do in order to overcome and access_ok checks? Thanks, Lev