linux-kernel - [RFC PATCH 07/21] Revert "list: Use WRITE_ONCE() when adding to lists and hlists"

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Message-Id: <20200324153643.15527-8-will@kernel.org>
Date:   Tue, 24 Mar 2020 15:36:29 +0000
From:   Will Deacon <will@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Will Deacon <will@...nel.org>, Eric Dumazet <edumazet@...gle.com>,
        Jann Horn <jannh@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Maddie Stone <maddiestone@...gle.com>,
        Marco Elver <elver@...gle.com>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>, kernel-team@...roid.com,
        kernel-hardening@...ts.openwall.com
Subject: [RFC PATCH 07/21] Revert "list: Use WRITE_ONCE() when adding to lists and hlists"

This reverts commit 1c97be677f72b3c338312aecd36d8fff20322f32.

There is no need to use WRITE_ONCE() for the non-RCU list and hlist
implementations.

Cc: Paul E. McKenney <paulmck@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Will Deacon <will@...nel.org>
---
 include/linux/list.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/list.h b/include/linux/list.h
index ec1f780d1449..c7331c259792 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -70,7 +70,7 @@ static inline void __list_add(struct list_head *new,
 	next->prev = new;
 	new->next = next;
 	new->prev = prev;
-	WRITE_ONCE(prev->next, new);
+	prev->next = new;
 }
 
 /**
@@ -843,7 +843,7 @@ static inline void hlist_add_head(struct hlist_node *n, struct hlist_head *h)
 	n->next = first;
 	if (first)
 		first->pprev = &n->next;
-	WRITE_ONCE(h->first, n);
+	h->first = n;
 	n->pprev = &h->first;
 }
 
@@ -858,7 +858,7 @@ static inline void hlist_add_before(struct hlist_node *n,
 	n->pprev = next->pprev;
 	n->next = next;
 	next->pprev = &n->next;
-	WRITE_ONCE(*(n->pprev), n);
+	*(n->pprev) = n;
 }
 
 /**
-- 
2.20.1