From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Mon, 3 Feb 2025 15:05:22 +0000 (+0100)
Subject: rcu: provide a static initializer for hlist_nulls_head
X-Git-Tag: v6.15-rc1~80^2~60
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8c6bbda879b62f16bb03321a84554b4f63415c55;p=thirdparty%2Flinux.git

rcu: provide a static initializer for hlist_nulls_head

Patch series "ucount: Simplify refcounting with rcuref_t".

I noticed that the atomic_dec_and_lock_irqsave() in put_ucounts() loops
sometimes even during boot.  Something like 2-3 iterations but still.
This series replaces the refcounting with rcuref_t and adds a RCU lookup.

This allows a lockless lookup in alloc_ucounts() if the entry is available
and a cmpxchg()less put of the item.


This patch (of 4):

Provide a static initializer for hlist_nulls_head so that it can be used
in statically defined data structures.

Link: https://lkml.kernel.org/r/20250203150525.456525-1-bigeasy@linutronix.de
Link: https://lkml.kernel.org/r/20250203150525.456525-2-bigeasy@linutronix.de
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Reviewed-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Lai jiangshan <jiangshanlai@gmail.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Mengen Sun <mengensun@tencent.com>
Cc: "Paul E . McKenney" <paulmck@kernel.org>
Cc: "Uladzislau Rezki (Sony)" <urezki@gmail.com>
Cc: YueHong Wu <yuehongwu@tencent.com>
Cc: Zqiang <qiang.zhang1211@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/include/linux/list_nulls.h b/include/linux/list_nulls.h
index fa6e8471bd227..248db9b77ee24 100644
--- a/include/linux/list_nulls.h
+++ b/include/linux/list_nulls.h
@@ -28,6 +28,7 @@ struct hlist_nulls_node {
 #define NULLS_MARKER(value) (1UL | (((long)value) << 1))
 #define INIT_HLIST_NULLS_HEAD(ptr, nulls) \
 	((ptr)->first = (struct hlist_nulls_node *) NULLS_MARKER(nulls))
+#define HLIST_NULLS_HEAD_INIT(nulls) {.first = (struct hlist_nulls_node *)NULLS_MARKER(nulls)}
 
 #define hlist_nulls_entry(ptr, type, member) container_of(ptr,type,member)