How to allocate OSX kernel memory atomically?

[xuzhao9]

Hello! I am also trying to port iwlwifi to OSX.
I met a problem when trying to rewrite the Linux code.
The Linux driver often allocates the memory atomically, e.g.:
phy_db->calib_ch_group_papd = kcalloc(chg_id + 1,
sizeof(struct iwl_phy_db_entry),
GFP_ATOMIC);

However, IOMalloc in OSX IOKit doesn't provide a similar feature like GFP_ATOMIC. May I ask how do you solve thsi issue?
Your code helps a lot with my porting. Thank you in advance.