From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/mm/backing-dev.c | 12 ++++++++++--
1 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/kernel/mm/backing-dev.c b/kernel/mm/backing-dev.c
index ca770a7..dd08ab9 100644
--- a/kernel/mm/backing-dev.c
+++ b/kernel/mm/backing-dev.c
@@ -378,6 +378,15 @@
static DEFINE_SPINLOCK(cgwb_lock);
static struct workqueue_struct *cgwb_release_wq;
+static void cgwb_free_rcu(struct rcu_head *rcu_head)
+{
+ struct bdi_writeback *wb = container_of(rcu_head,
+ struct bdi_writeback, rcu);
+
+ percpu_ref_exit(&wb->refcnt);
+ kfree(wb);
+}
+
static void cgwb_release_workfn(struct work_struct *work)
{
struct bdi_writeback *wb = container_of(work, struct bdi_writeback,
@@ -395,9 +404,8 @@
blkcg_unpin_online(blkcg);
fprop_local_destroy_percpu(&wb->memcg_completions);
- percpu_ref_exit(&wb->refcnt);
wb_exit(wb);
- kfree_rcu(wb, rcu);
+ call_rcu(&wb->rcu, cgwb_free_rcu);
}
static void cgwb_release(struct percpu_ref *refcnt)
--
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