linux-kernel - Re: [PATCH] rcu: Remove rcu

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Message-ID: <20121003202929.GU2527@linux.vnet.ibm.com>
Date:	Wed, 3 Oct 2012 13:29:29 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Josh Triplett <josh@...htriplett.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] rcu: Remove rcu_switch()

On Wed, Oct 03, 2012 at 10:05:43PM +0200, Frederic Weisbecker wrote:
> On Wed, Oct 03, 2012 at 11:39:45AM -0700, Paul E. McKenney wrote:
> > On Wed, Oct 03, 2012 at 08:21:52PM +0200, Frederic Weisbecker wrote:
> > > It's only there to call rcu_user_hooks_switch(). Let's
> > > just call rcu_user_hooks_switch() directly, we don't need this
> > > function in the middle.
> > 
> > Hello, Frederic!
> > 
> > Doesn't this also require an empty definition of rcu_user_hooks_switch()
> > to handle the CONFIG_RCU_USER_QS=n case?  Or is there already such
> > a definition that I am too blind to see?
> 
> There is, look below:

Right you are!  Queued.

							Thanx, Paul

> > > Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
> > > Cc: Josh Triplett <josh@...htriplett.org>
> > > Cc: Peter Zijlstra <peterz@...radead.org>
> > > ---
> > >  include/linux/rcupdate.h |    2 ++
> > >  include/linux/sched.h    |    8 --------
> > >  kernel/sched/core.c      |    2 +-
> > >  3 files changed, 3 insertions(+), 9 deletions(-)
> > > 
> > > diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
> > > index 7c968e4..5d009de 100644
> > > --- a/include/linux/rcupdate.h
> > > +++ b/include/linux/rcupdate.h
> > > @@ -204,6 +204,8 @@ static inline void rcu_user_enter(void) { }
> > >  static inline void rcu_user_exit(void) { }
> > >  static inline void rcu_user_enter_after_irq(void) { }
> > >  static inline void rcu_user_exit_after_irq(void) { }
> > > +static inline void rcu_user_hooks_switch(struct task_struct *prev,
> > > +					 struct task_struct *next) { }
> 
> Here.
> 
> > >  #endif /* CONFIG_RCU_USER_QS */
> --
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