linux-kernel - Re: [rcu:rcu/dev 70/71] kernel/rcu/sync.c:68:2: warning: 'deprecate_rcu_lockdep_assert' is deprecated (declared at include/linux/rcupdate.h:541)

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Date:	Mon, 14 Sep 2015 09:28:47 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	kbuild test robot <fengguang.wu@...el.com>, kbuild-all@...org,
	linux-kernel@...r.kernel.org
Subject: Re: [rcu:rcu/dev 70/71] kernel/rcu/sync.c:68:2: warning:
 'deprecate_rcu_lockdep_assert' is deprecated (declared at
 include/linux/rcupdate.h:541)

On Mon, Sep 14, 2015 at 05:55:20PM +0200, Oleg Nesterov wrote:
> On 09/12, Paul E. McKenney wrote:
> >
> > I should have noticed this...
> 
> Heh, me too :/
> 
> Thanks a lot Fengguang!
> 
> > The new rcu_lockdep_assert() is RCU_LOCKDEP_WARN().  I am guessing
> > that you would like to also make rcu_sync_lockdep_assert() be
> > RCU_SYNC_LOCKDEP_WARN()?
> 
> I am fine either way. Unless you have already fixed this in your tree,
> I'd suggest the trivial fix below.

I got that one, but failed to clean up the indentation.  Fixed that
as well.

> But please let me know you want me to make another trivial change which
> turns rcu_sync_lockdep_assert() into
> 
> 	bool rcu_sync_read_lock_held(struct rcu_sync *rsp)
> 	{
> 		return gp_ops[rsp->gp_type].held();
> 	}
> 
> and rcu_sync_is_idle() into
> 
> 	static inline bool rcu_sync_is_idle(struct rcu_sync *rsp)
> 	{
> 		RCU_LOCKDEP_WARN(!rcu_sync_read_lock_held(rsp),
> 				 "suspicious rcu_sync_is_idle() usage");
> 		return !rsp->gp_state; /* GP_IDLE */
> 	}

There does seem to be a strong desire to move away from "assert" to
"WARN", so please do!

							Thanx, Paul

> -------------------------------------------------------------------------------
> >From 37fb0c136b979b0ef6a4ade1c7a14c8207533b2d Mon Sep 17 00:00:00 2001
> From: Oleg Nesterov <oleg@...hat.com>
> Date: Mon, 14 Sep 2015 10:54:10 -0400
> Subject: [PATCH] rcu_sync: Use RCU_LOCKDEP_WARN() rather than rcu_lockdep_assert()
> 
> rcu_lockdep_assert() is deprecated, change rcu_sync_lockdep_assert()
> to use RCU_LOCKDEP_WARN().
> 
> Reported-by: Fengguang Wu <fengguang.wu@...el.com>
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>
> ---
>  kernel/rcu/sync.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/rcu/sync.c b/kernel/rcu/sync.c
> index 56ae79d..be922c9 100644
> --- a/kernel/rcu/sync.c
> +++ b/kernel/rcu/sync.c
> @@ -65,8 +65,8 @@ enum { CB_IDLE = 0, CB_PENDING, CB_REPLAY };
>  #ifdef CONFIG_PROVE_RCU
>  void rcu_sync_lockdep_assert(struct rcu_sync *rsp)
>  {
> -	rcu_lockdep_assert(gp_ops[rsp->gp_type].held(),
> -			   "suspicious rcu_sync_is_idle() usage");
> +	RCU_LOCKDEP_WARN(!gp_ops[rsp->gp_type].held(),
> +			 "suspicious rcu_sync_is_idle() usage");
>  }
>  #endif
> 
> -- 
> 2.4.3
> 
> 

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