The patch titled
Subject: mm/swap_cgroup: remove swap_cgroup_cmpxchg
has been added to the -mm mm-unstable branch. Its filename is
mm-swap_cgroup-remove-swap_cgroup_cmpxchg.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-swap_cgroup-remove-swap_cgroup_cmpxchg.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Kairui Song <kasong@xxxxxxxxxxx>
Subject: mm/swap_cgroup: remove swap_cgroup_cmpxchg
Date: Tue, 10 Dec 2024 17:28:04 +0800
This function is never used after commit 6b611388b626 ("memcg-v1: remove
charge move code").
Link: https://lkml.kernel.org/r/20241210092805.87281-3-ryncsn@xxxxxxxxx
Signed-off-by: Kairui Song <kasong@xxxxxxxxxxx>
Reviewed-by: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
Reviewed-by: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Acked-by: Shakeel Butt <shakeel.butt@xxxxxxxxx>
Acked-by: Chris Li <chrisl@xxxxxxxxxx>
Cc: Barry Song <baohua@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/swap_cgroup.h | 2 --
mm/swap_cgroup.c | 29 -----------------------------
2 files changed, 31 deletions(-)
--- a/include/linux/swap_cgroup.h~mm-swap_cgroup-remove-swap_cgroup_cmpxchg
+++ a/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);
--- a/mm/swap_cgroup.c~mm-swap_cgroup-remove-swap_cgroup_cmpxchg
+++ a/mm/swap_cgroup.c
@@ -46,35 +46,6 @@ static struct swap_cgroup *lookup_swap_c
}
/**
- * 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
* @id: mem_cgroup to be recorded
_
Patches currently in -mm which might be from kasong@xxxxxxxxxxx are
zram-refuse-to-use-zero-sized-block-device-as-backing-device.patch
zram-fix-uninitialized-zram-not-releasing-backing-device.patch
mm-memcontrol-avoid-duplicated-memcg-enable-check.patch
mm-swap_cgroup-remove-swap_cgroup_cmpxchg.patch
mm-swap_cgroup-remove-global-swap-cgroup-lock.patch
