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Date: Tue, 24 Mar 2020 15:36:31 +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 09/21] list: Remove unnecessary WRITE_ONCE() from hlist_bl_add_before()
There is no need to use WRITE_ONCE() when inserting into a non-RCU
protected list.
Cc: Paul E. McKenney <paulmck@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Will Deacon <will@...nel.org>
---
include/linux/list_bl.h | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/include/linux/list_bl.h b/include/linux/list_bl.h
index 1804fdb84dda..c93e7e3aa8fc 100644
--- a/include/linux/list_bl.h
+++ b/include/linux/list_bl.h
@@ -91,15 +91,15 @@ static inline void hlist_bl_add_before(struct hlist_bl_node *n,
struct hlist_bl_node *next)
{
struct hlist_bl_node **pprev = next->pprev;
+ unsigned long val;
n->pprev = pprev;
n->next = next;
next->pprev = &n->next;
/* pprev may be `first`, so be careful not to lose the lock bit */
- WRITE_ONCE(*pprev,
- (struct hlist_bl_node *)
- ((uintptr_t)n | ((uintptr_t)*pprev & LIST_BL_LOCKMASK)));
+ val = (unsigned long)n | ((unsigned long)*pprev & LIST_BL_LOCKMASK);
+ *pprev = (struct hlist_bl_node *)val;
}
static inline void hlist_bl_add_behind(struct hlist_bl_node *n,
--
2.20.1
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