From 6e426e0fcd20ce144bb93e00b70df51e9f2e08c3 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <peterz@infradead.org>
Date: Sat, 29 Aug 2020 22:03:56 +0900
Subject: kprobes: Replace rp->free_instance with freelist

Gets rid of rp->lock, and as a result kretprobes are now fully
lockless.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/159870623583.1229682.17472357584134058687.stgit@devnote2
---
 include/linux/kprobes.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

(limited to 'include')

diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index 00cf4421efd5..b7824e3f1ef5 100644
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -28,6 +28,7 @@
 #include <linux/mutex.h>
 #include <linux/ftrace.h>
 #include <linux/refcount.h>
+#include <linux/freelist.h>
 #include <asm/kprobes.h>
 
 #ifdef CONFIG_KPROBES
@@ -157,17 +158,16 @@ struct kretprobe {
 	int maxactive;
 	int nmissed;
 	size_t data_size;
-	struct hlist_head free_instances;
+	struct freelist_head freelist;
 	struct kretprobe_holder *rph;
-	raw_spinlock_t lock;
 };
 
 struct kretprobe_instance {
 	union {
-		struct llist_node llist;
-		struct hlist_node hlist;
+		struct freelist_node freelist;
 		struct rcu_head rcu;
 	};
+	struct llist_node llist;
 	struct kretprobe_holder *rph;
 	kprobe_opcode_t *ret_addr;
 	void *fp;
-- 
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