From: Kairui Song <kasong@tencent.com>

This function is never used after commit 6b611388b626
("memcg-v1: remove charge move code").

Signed-off-by: Kairui Song <kasong@tencent.com>
Reviewed-by: Yosry Ahmed <yosryahmed@google.com>
Reviewed-by: Roman Gushchin <roman.gushchin@linux.dev>
Acked-by: Shakeel Butt <shakeel.butt@linux.dev>
Acked-by: Chris Li <chrisl@kernel.org>
---
 include/linux/swap_cgroup.h |  2 --
 mm/swap_cgroup.c            | 29 -----------------------------
 2 files changed, 31 deletions(-)

diff --git a/include/linux/swap_cgroup.h b/include/linux/swap_cgroup.h
index ae73a87775b3..d521ad1c4164 100644
--- a/include/linux/swap_cgroup.h
+++ b/include/linux/swap_cgroup.h
@@ -6,8 +6,6 @@
 
 #if defined(CONFIG_MEMCG) && defined(CONFIG_SWAP)
 
-extern unsigned short swap_cgroup_cmpxchg(swp_entry_t ent,
-					unsigned short old, unsigned short new);
 extern unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id,
 					 unsigned int nr_ents);
 extern unsigned short lookup_swap_cgroup_id(swp_entry_t ent);
diff --git a/mm/swap_cgroup.c b/mm/swap_cgroup.c
index f63d1aa072a1..1770b076f6b7 100644
--- a/mm/swap_cgroup.c
+++ b/mm/swap_cgroup.c
@@ -45,35 +45,6 @@ static struct swap_cgroup *lookup_swap_cgroup(swp_entry_t ent,
 	return &ctrl->map[offset];
 }
 
-/**
- * swap_cgroup_cmpxchg - cmpxchg mem_cgroup's id for this swp_entry.
- * @ent: swap entry to be cmpxchged
- * @old: old id
- * @new: new id
- *
- * Returns old id at success, 0 at failure.
- * (There is no mem_cgroup using 0 as its id)
- */
-unsigned short swap_cgroup_cmpxchg(swp_entry_t ent,
-					unsigned short old, unsigned short new)
-{
-	struct swap_cgroup_ctrl *ctrl;
-	struct swap_cgroup *sc;
-	unsigned long flags;
-	unsigned short retval;
-
-	sc = lookup_swap_cgroup(ent, &ctrl);
-
-	spin_lock_irqsave(&ctrl->lock, flags);
-	retval = sc->id;
-	if (retval == old)
-		sc->id = new;
-	else
-		retval = 0;
-	spin_unlock_irqrestore(&ctrl->lock, flags);
-	return retval;
-}
-
 /**
  * swap_cgroup_record - record mem_cgroup for a set of swap entries
  * @ent: the first swap entry to be recorded into
-- 
2.47.1