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Date:	Tue, 6 Oct 2015 22:07:25 +0200
From:	Peter Zijlstra <>
To:	"Paul E. McKenney" <>
Subject: Re: [PATCH tip/core/rcu 07/13] rcu: Move preemption disabling out of

On Tue, Oct 06, 2015 at 09:13:42AM -0700, Paul E. McKenney wrote:
> Currently, __srcu_read_lock() cannot be invoked from restricted
> environments because it contains calls to preempt_disable() and
> preempt_enable(), both of which can invoke lockdep, which is a bad
> idea in some restricted execution modes.  This commit therefore moves
> the preempt_disable() and preempt_enable() from __srcu_read_lock()
> to srcu_read_lock().  It also inserts the preempt_disable() and
> preempt_enable() around the call to __srcu_read_lock() in do_exit().

Did you not simply want to use: preempt_disable_notrace() ?
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