linux-kernel - Re: [PATCH 2/3] rcu: Create rcu

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Message-ID: <20131003170052.GA21009@redhat.com>
Date:	Thu, 3 Oct 2013 19:00:52 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] rcu: Create rcu_sync infrastructure

On 10/03, Paul E. McKenney wrote:
>
> How about the something like the following, where ->read_side_check()
> gets rcu_read_lock_held(), rcu_read_lock_bh_held(), or
> rcu_read_lock_sched_held(), as appropriate?
>
> #ifdef CONFIG_PROVE_RCU
> #define rcu_sync_is_idle_check(rss) BUG_ON(!rss->read_side_check())
> #else
> #define rcu_sync_is_idle_check(rss) do { } while (0)
> #endif
>
> 	rcu_sync_is_idle_check(rss);

Agreed!

but can't we do this in a separate patch? (I will be happy to do
this trivial exercise ;)

This change is trivial, but perhaps it would be better to keep the
initial patch as simple as possible. And discuss the potential
"cosmetic" issues (like naming) separately. Say, rcu_lockdep_assert.
We can't use it directly, we need the new helper.

Oleg.

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