1 files changed, 0 insertions, 172 deletions
diff --git a/mm/swap_cgroup.c b/mm/swap_cgroup.c
deleted file mode 100644
index de779fed8c21..000000000000
--- a/mm/swap_cgroup.c
+++ /dev/null
@@ -1,172 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/swap_cgroup.h>
-#include <linux/vmalloc.h>
-#include <linux/mm.h>
-
-#include <linux/swapops.h> /* depends on mm.h include */
-
-static DEFINE_MUTEX(swap_cgroup_mutex);
-
-/* Pack two cgroup id (short) of two entries in one swap_cgroup (atomic_t) */
-#define ID_PER_SC (sizeof(struct swap_cgroup) / sizeof(unsigned short))
-#define ID_SHIFT (BITS_PER_TYPE(unsigned short))
-#define ID_MASK (BIT(ID_SHIFT) - 1)
-struct swap_cgroup {
-	atomic_t ids;
-};
-
-struct swap_cgroup_ctrl {
-	struct swap_cgroup *map;
-};
-
-static struct swap_cgroup_ctrl swap_cgroup_ctrl[MAX_SWAPFILES];
-
-static unsigned short __swap_cgroup_id_lookup(struct swap_cgroup *map,
-					      pgoff_t offset)
-{
-	unsigned int shift = (offset % ID_PER_SC) * ID_SHIFT;
-	unsigned int old_ids = atomic_read(&map[offset / ID_PER_SC].ids);
-
-	BUILD_BUG_ON(!is_power_of_2(ID_PER_SC));
-	BUILD_BUG_ON(sizeof(struct swap_cgroup) != sizeof(atomic_t));
-
-	return (old_ids >> shift) & ID_MASK;
-}
-
-static unsigned short __swap_cgroup_id_xchg(struct swap_cgroup *map,
-					    pgoff_t offset,
-					    unsigned short new_id)
-{
-	unsigned short old_id;
-	struct swap_cgroup *sc = &map[offset / ID_PER_SC];
-	unsigned int shift = (offset % ID_PER_SC) * ID_SHIFT;
-	unsigned int new_ids, old_ids = atomic_read(&sc->ids);
-
-	do {
-		old_id = (old_ids >> shift) & ID_MASK;
-		new_ids = (old_ids & ~(ID_MASK << shift));
-		new_ids |= ((unsigned int)new_id) << shift;
-	} while (!atomic_try_cmpxchg(&sc->ids, &old_ids, new_ids));
-
-	return old_id;
-}
-
-/**
- * swap_cgroup_record - record mem_cgroup for a set of swap entries.
- * These entries must belong to one single folio, and that folio
- * must be being charged for swap space (swap out), and these
- * entries must not have been charged
- *
- * @folio: the folio that the swap entry belongs to
- * @id: mem_cgroup ID to be recorded
- * @ent: the first swap entry to be recorded
- */
-void swap_cgroup_record(struct folio *folio, unsigned short id,
-			swp_entry_t ent)
-{
-	unsigned int nr_ents = folio_nr_pages(folio);
-	struct swap_cgroup *map;
-	pgoff_t offset, end;
-	unsigned short old;
-
-	offset = swp_offset(ent);
-	end = offset + nr_ents;
-	map = swap_cgroup_ctrl[swp_type(ent)].map;
-
-	do {
-		old = __swap_cgroup_id_xchg(map, offset, id);
-		VM_BUG_ON(old);
-	} while (++offset != end);
-}
-
-/**
- * swap_cgroup_clear - clear mem_cgroup for a set of swap entries.
- * These entries must be being uncharged from swap. They either
- * belongs to one single folio in the swap cache (swap in for
- * cgroup v1), or no longer have any users (slot freeing).
- *
- * @ent: the first swap entry to be recorded into
- * @nr_ents: number of swap entries to be recorded
- *
- * Returns the existing old value.
- */
-unsigned short swap_cgroup_clear(swp_entry_t ent, unsigned int nr_ents)
-{
-	pgoff_t offset, end;
-	struct swap_cgroup *map;
-	unsigned short old, iter = 0;
-
-	offset = swp_offset(ent);
-	end = offset + nr_ents;
-	map = swap_cgroup_ctrl[swp_type(ent)].map;
-
-	do {
-		old = __swap_cgroup_id_xchg(map, offset, 0);
-		if (!iter)
-			iter = old;
-		VM_BUG_ON(iter != old);
-	} while (++offset != end);
-
-	return old;
-}
-
-/**
- * lookup_swap_cgroup_id - lookup mem_cgroup id tied to swap entry
- * @ent: swap entry to be looked up.
- *
- * Returns ID of mem_cgroup at success. 0 at failure. (0 is invalid ID)
- */
-unsigned short lookup_swap_cgroup_id(swp_entry_t ent)
-{
-	struct swap_cgroup_ctrl *ctrl;
-
-	if (mem_cgroup_disabled())
-		return 0;
-
-	ctrl = &swap_cgroup_ctrl[swp_type(ent)];
-	return __swap_cgroup_id_lookup(ctrl->map, swp_offset(ent));
-}
-
-int swap_cgroup_swapon(int type, unsigned long max_pages)
-{
-	struct swap_cgroup *map;
-	struct swap_cgroup_ctrl *ctrl;
-
-	if (mem_cgroup_disabled())
-		return 0;
-
-	BUILD_BUG_ON(sizeof(unsigned short) * ID_PER_SC !=
-		     sizeof(struct swap_cgroup));
-	map = vzalloc(DIV_ROUND_UP(max_pages, ID_PER_SC) *
-		      sizeof(struct swap_cgroup));
-	if (!map)
-		goto nomem;
-
-	ctrl = &swap_cgroup_ctrl[type];
-	mutex_lock(&swap_cgroup_mutex);
-	ctrl->map = map;
-	mutex_unlock(&swap_cgroup_mutex);
-
-	return 0;
-nomem:
-	pr_info("couldn't allocate enough memory for swap_cgroup\n");
-	pr_info("swap_cgroup can be disabled by swapaccount=0 boot option\n");
-	return -ENOMEM;
-}
-
-void swap_cgroup_swapoff(int type)
-{
-	struct swap_cgroup *map;
-	struct swap_cgroup_ctrl *ctrl;
-
-	if (mem_cgroup_disabled())
-		return;
-
-	mutex_lock(&swap_cgroup_mutex);
-	ctrl = &swap_cgroup_ctrl[type];
-	map = ctrl->map;
-	ctrl->map = NULL;
-	mutex_unlock(&swap_cgroup_mutex);
-
-	vfree(map);
-}