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Date: Tue, 24 Mar 2020 15:36:24 +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 02/21] list: Remove hlist_nulls_unhashed_lockless()
Commit 02b99b38f3d9 ("rcu: Add a hlist_nulls_unhashed_lockless() function")
introduced the (as yet unused) hlist_nulls_unhashed_lockless() function
to avoid KCSAN reports when an RCU reader checks the 'hashed' status
of an 'hlist_nulls' concurrently undergoing modification.
Remove the unused function and add a READ_ONCE() to hlist_nulls_unhashed(),
just like we do already for hlist_nulls_empty().
Cc: Paul E. McKenney <paulmck@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Will Deacon <will@...nel.org>
---
include/linux/list_nulls.h | 14 --------------
1 file changed, 14 deletions(-)
diff --git a/include/linux/list_nulls.h b/include/linux/list_nulls.h
index fa6e8471bd22..3a9ff01e9a11 100644
--- a/include/linux/list_nulls.h
+++ b/include/linux/list_nulls.h
@@ -65,20 +65,6 @@ static inline unsigned long get_nulls_value(const struct hlist_nulls_node *ptr)
* but hlist_nulls_del() does not.
*/
static inline int hlist_nulls_unhashed(const struct hlist_nulls_node *h)
-{
- return !h->pprev;
-}
-
-/**
- * hlist_nulls_unhashed_lockless - Has node been removed and reinitialized?
- * @h: Node to be checked
- *
- * Not that not all removal functions will leave a node in unhashed state.
- * For example, hlist_del_init_rcu() leaves the node in unhashed state,
- * but hlist_nulls_del() does not. Unlike hlist_nulls_unhashed(), this
- * function may be used locklessly.
- */
-static inline int hlist_nulls_unhashed_lockless(const struct hlist_nulls_node *h)
{
return !READ_ONCE(h->pprev);
}
--
2.20.1
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