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

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Message-ID: <20131003171511.GK5790@linux.vnet.ibm.com>
Date:	Thu, 3 Oct 2013 10:15:11 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.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 Thu, Oct 03, 2013 at 07:00:52PM +0200, Oleg Nesterov wrote:
> 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 ;)

I am good with that.

> 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.

OK, with s/xxx_/rcu_sync_/ in the comit log:

Reviewed-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

But someone else needs to lock all the candidate names in a room
overnight and tend to the resulting wounds.  ;-)

							Thanx, Paul

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