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Date: Tue, 24 Mar 2020 17:27:25 +0100
From: Greg KH <greg@...ah.com>
To: Will Deacon <will@...nel.org>
Cc: linux-kernel@...r.kernel.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: Re: [RFC PATCH 02/21] list: Remove hlist_nulls_unhashed_lockless()
On Tue, Mar 24, 2020 at 03:36:24PM +0000, Will Deacon wrote:
> 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(-)
Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
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