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Date: Tue, 31 Mar 2020 14:11:54 +0100
From: Will Deacon <>
To: "Paul E. McKenney" <>
Cc:, Eric Dumazet <>,
	Jann Horn <>, Kees Cook <>,
	Maddie Stone <>,
	Marco Elver <>,
	Peter Zijlstra <>,
	Thomas Gleixner <>,,
Subject: Re: [RFC PATCH 08/21] Revert "list: Use WRITE_ONCE() when
 initializing list_head structures"

On Mon, Mar 30, 2020 at 04:25:05PM -0700, Paul E. McKenney wrote:
> On Tue, Mar 24, 2020 at 03:36:30PM +0000, Will Deacon wrote:
> > This reverts commit 2f073848c3cc8aff2655ab7c46d8c0de90cf4e50.
> > 
> > There is no need to use WRITE_ONCE() to initialise a non-RCU 'list_head'.
> > 
> > Cc: Paul E. McKenney <>
> > Cc: Peter Zijlstra <>
> > Signed-off-by: Will Deacon <>
> And attention to lockless uses of list_empty() here, correct?
> Depending on the outcome of discussions on 3/21, I should have added in
> all three cases.

Yes, patch 3 is where this will get sorted. It looks like we'll have to
disable KCSAN around the READ_ONCE() over there, but I also need to finish
wrapping my head around list_empty_careful() because I'm deeply suspicious!


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