The quilt patch titled
Subject: mm, swap: remove setting SWAP_MAP_BAD for discard cluster
has been removed from the -mm tree. Its filename was
mm-swap-remove-setting-swap_map_bad-for-discard-cluster.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>
Subject: mm, swap: remove setting SWAP_MAP_BAD for discard cluster
Date: Sun, 23 Feb 2025 00:08:48 +0800
Before alloc from a cluster, we will aqcuire cluster's lock and make sure
it is usable by cluster_is_usable(), so there is no need to set
SWAP_MAP_BAD for cluster to be discarded.
Link: https://lkml.kernel.org/r/20250222160850.505274-5-shikemeng@xxxxxxxxxxxxxxx
Signed-off-by: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>
Reviewed-by: Kairui Song <kasong@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/swapfile.c | 11 -----------
1 file changed, 11 deletions(-)
--- a/mm/swapfile.c~mm-swap-remove-setting-swap_map_bad-for-discard-cluster
+++ a/mm/swapfile.c
@@ -479,15 +479,6 @@ static void move_cluster(struct swap_inf
static void swap_cluster_schedule_discard(struct swap_info_struct *si,
struct swap_cluster_info *ci)
{
- unsigned int idx = cluster_index(si, ci);
- /*
- * If scan_swap_map_slots() can't find a free cluster, it will check
- * si->swap_map directly. To make sure the discarding cluster isn't
- * taken by scan_swap_map_slots(), mark the swap entries bad (occupied).
- * It will be cleared after discard
- */
- memset(si->swap_map + idx * SWAPFILE_CLUSTER,
- SWAP_MAP_BAD, SWAPFILE_CLUSTER);
VM_BUG_ON(ci->flags == CLUSTER_FLAG_FREE);
move_cluster(si, ci, &si->discard_clusters, CLUSTER_FLAG_DISCARD);
schedule_work(&si->discard_work);
@@ -571,8 +562,6 @@ static bool swap_do_scheduled_discard(st
* return the cluster to allocation list.
*/
ci->flags = CLUSTER_FLAG_NONE;
- memset(si->swap_map + idx * SWAPFILE_CLUSTER,
- 0, SWAPFILE_CLUSTER);
__free_cluster(si, ci);
spin_unlock(&ci->lock);
ret = true;
_
Patches currently in -mm which might be from shikemeng@xxxxxxxxxxxxxxx are
