linux-kernel - [RFC][PATCH 0/3] spin_unlock

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Message-Id: <20160524142723.178148277@infradead.org>
Date:	Tue, 24 May 2016 16:27:23 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	manfred@...orfullife.com, dave@...olabs.net,
	paulmck@...ux.vnet.ibm.com, will.deacon@....com
Cc:	boqun.feng@...il.com, Waiman.Long@....com, tj@...nel.org,
	pablo@...filter.org, kaber@...sh.net, davem@...emloft.net,
	oleg@...hat.com, netfilter-devel@...r.kernel.org,
	sasha.levin@...cle.com, hofrat@...dl.org
Subject: [RFC][PATCH 0/3] spin_unlock_wait and assorted borkage

As per recent discussions spin_unlock_wait() has an unintuitive 'feature'.

  lkml.kernel.org/r/20160520053926.GC31084@...ux-uzut.site

These patches pull the existing solution into generic code; annotate all
spin_unlock_wait() users and fix nf_conntrack more.

The alternative -- putting smp_acquire__after_ctrl_dep() into
spin_unlock_wait() can be done later if desired, now that al users are audited
and corrected.

Please (very) carefully consider.