The patch titled
Subject: mm, swap: fold swap_info_get_cont in the only caller
has been added to the -mm mm-unstable branch. Its filename is
mm-swap-fold-swap_info_get_cont-in-the-only-caller.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-swap-fold-swap_info_get_cont-in-the-only-caller.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: fold swap_info_get_cont in the only caller
Date: Tue, 31 Dec 2024 01:46:10 +0800
The name of the function is confusing, and the code is much easier to
follow after folding, also rename the confusing naming "p" to more
meaningful "si".
Link: https://lkml.kernel.org/r/20241230174621.61185-3-ryncsn@xxxxxxxxx
Signed-off-by: Kairui Song <kasong@xxxxxxxxxxx>
Cc: Barry Song <v-songbaohua@xxxxxxxx>
Cc: Chris Li <chrisl@xxxxxxxxxx>
Cc: "Huang, Ying" <ying.huang@xxxxxxxxxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Kalesh Singh <kaleshsingh@xxxxxxxxxx>
Cc: Nhat Pham <nphamcs@xxxxxxxxx>
Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
Cc: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/swapfile.c | 39 +++++++++++++++------------------------
1 file changed, 15 insertions(+), 24 deletions(-)
--- a/mm/swapfile.c~mm-swap-fold-swap_info_get_cont-in-the-only-caller
+++ a/mm/swapfile.c
@@ -1375,22 +1375,6 @@ out:
return NULL;
}
-static struct swap_info_struct *swap_info_get_cont(swp_entry_t entry,
- struct swap_info_struct *q)
-{
- struct swap_info_struct *p;
-
- p = _swap_info_get(entry);
-
- if (p != q) {
- if (q != NULL)
- spin_unlock(&q->lock);
- if (p != NULL)
- spin_lock(&p->lock);
- }
- return p;
-}
-
static unsigned char __swap_entry_free_locked(struct swap_info_struct *si,
unsigned long offset,
unsigned char usage)
@@ -1687,14 +1671,14 @@ static int swp_entry_cmp(const void *ent
void swapcache_free_entries(swp_entry_t *entries, int n)
{
- struct swap_info_struct *p, *prev;
+ struct swap_info_struct *si, *prev;
int i;
if (n <= 0)
return;
prev = NULL;
- p = NULL;
+ si = NULL;
/*
* Sort swap entries by swap device, so each lock is only taken once.
@@ -1704,13 +1688,20 @@ void swapcache_free_entries(swp_entry_t
if (nr_swapfiles > 1)
sort(entries, n, sizeof(entries[0]), swp_entry_cmp, NULL);
for (i = 0; i < n; ++i) {
- p = swap_info_get_cont(entries[i], prev);
- if (p)
- swap_entry_range_free(p, entries[i], 1);
- prev = p;
+ si = _swap_info_get(entries[i]);
+
+ if (si != prev) {
+ if (prev != NULL)
+ spin_unlock(&prev->lock);
+ if (si != NULL)
+ spin_lock(&si->lock);
+ }
+ if (si)
+ swap_entry_range_free(si, entries[i], 1);
+ prev = si;
}
- if (p)
- spin_unlock(&p->lock);
+ if (si)
+ spin_unlock(&si->lock);
}
int __swap_count(swp_entry_t entry)
_
Patches currently in -mm which might be from kasong@xxxxxxxxxxx are
mm-list_lru-fix-false-warning-of-negative-counter.patch
mm-madvise-fix-potential-workingset-node-list_lru-leaks.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
mm-swap_cgroup-decouple-swap-cgroup-recording-and-clearing.patch
mm-swap-minor-clean-up-for-swap-entry-allocation.patch
mm-swap-fold-swap_info_get_cont-in-the-only-caller.patch
mm-swap-remove-old-allocation-path-for-hdd.patch
mm-swap-use-cluster-lock-for-hdd.patch
mm-swap-clean-up-device-availability-check.patch
mm-swap-clean-up-plist-removal-and-adding.patch
mm-swap-hold-a-reference-during-scan-and-cleanup-flag-usage.patch
mm-swap-use-an-enum-to-define-all-cluster-flags-and-wrap-flags-changes.patch
mm-swap-reduce-contention-on-device-lock.patch
mm-swap-simplify-percpu-cluster-updating.patch
mm-swap-introduce-a-helper-for-retrieving-cluster-from-offset.patch
mm-swap-use-a-global-swap-cluster-for-non-rotation-devices.patch
mm-swap_slots-remove-slot-cache-for-freeing-path.patch
