1 // SPDX-License-Identifier: GPL-2.0
10 	struct page **map;  member
28  *  - we have no race in "exchange" when we're accessed via SwapCache because
30  *  - When called via swap_free(), there is no user of this entry and no race.
47 	for (idx = 0; idx < ctrl->length; idx++) {  in swap_cgroup_prepare()
51 		ctrl->map[idx] = page;  in swap_cgroup_prepare()
60 		__free_page(ctrl->map[idx]);  in swap_cgroup_prepare()
62 	return -ENOMEM;  in swap_cgroup_prepare()
71 	mappage = ctrl->map[offset / SC_PER_PAGE];  in __lookup_swap_cgroup()
89  * swap_cgroup_cmpxchg - cmpxchg mem_cgroup's id for this swp_entry.
95  * (There is no mem_cgroup using 0 as its id)
107 	spin_lock_irqsave(&ctrl->lock, flags);  in swap_cgroup_cmpxchg()
108 	retval = sc->id;  in swap_cgroup_cmpxchg()
110 		sc->id = new;  in swap_cgroup_cmpxchg()
113 	spin_unlock_irqrestore(&ctrl->lock, flags);  in swap_cgroup_cmpxchg()
118  * swap_cgroup_record - record mem_cgroup for a set of swap entries
138 	spin_lock_irqsave(&ctrl->lock, flags);  in swap_cgroup_record()
139 	old = sc->id;  in swap_cgroup_record()
141 		VM_BUG_ON(sc->id != old);  in swap_cgroup_record()
142 		sc->id = id;  in swap_cgroup_record()
151 	spin_unlock_irqrestore(&ctrl->lock, flags);  in swap_cgroup_record()
157  * lookup_swap_cgroup_id - lookup mem_cgroup id tied to swap entry
164 	return lookup_swap_cgroup(ent, NULL)->id;  in lookup_swap_cgroup_id()
184 	ctrl->length = length;  in swap_cgroup_swapon()
185 	ctrl->map = array;  in swap_cgroup_swapon()
186 	spin_lock_init(&ctrl->lock);  in swap_cgroup_swapon()
189 		ctrl->map = NULL;  in swap_cgroup_swapon()
190 		ctrl->length = 0;  in swap_cgroup_swapon()
201 	return -ENOMEM;  in swap_cgroup_swapon()
206 	struct page **map;  in swap_cgroup_swapoff()  local
215 	map = ctrl->map;  in swap_cgroup_swapoff()
216 	length = ctrl->length;  in swap_cgroup_swapoff()
217 	ctrl->map = NULL;  in swap_cgroup_swapoff()
218 	ctrl->length = 0;  in swap_cgroup_swapoff()
221 	if (map) {  in swap_cgroup_swapoff()
223 			struct page *page = map[i];  in swap_cgroup_swapoff()
229 		vfree(map);  in swap_cgroup_swapoff()