linux-kernel - Re: [PATCH tip/core/rcu 2/7] sfc: Replace spin_is

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Message-Id: <20181112170742.GP4170@linux.ibm.com>
Date:   Mon, 12 Nov 2018 09:07:42 -0800
From:   "Paul E. McKenney" <paulmck@...ux.ibm.com>
To:     Edward Cree <ecree@...arflare.com>
Cc:     linux-kernel@...r.kernel.org, mingo@...nel.org,
        jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
        fweisbec@...il.com, oleg@...hat.com, joel@...lfernandes.org,
        Lance Roy <ldr709@...il.com>,
        Solarflare linux maintainers <linux-net-drivers@...arflare.com>,
        Bert Kenward <bkenward@...arflare.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH tip/core/rcu 2/7] sfc: Replace spin_is_locked() with
 lockdep

On Mon, Nov 12, 2018 at 01:02:32PM +0000, Edward Cree wrote:
> On 11/11/18 20:04, Paul E. McKenney wrote:
> > From: Lance Roy <ldr709@...il.com>
> >
> > lockdep_assert_held() is better suited to checking locking requirements,
> > since it only checks if the current thread holds the lock regardless of
> > whether someone else does. This is also a step towards possibly removing
> > spin_is_locked().
> >
> > Signed-off-by: Lance Roy <ldr709@...il.com>
> > Cc: Solarflare linux maintainers <linux-net-drivers@...arflare.com>
> > Cc: Edward Cree <ecree@...arflare.com>
> > Cc: Bert Kenward <bkenward@...arflare.com>
> > Cc: "David S. Miller" <davem@...emloft.net>
> > Cc: <netdev@...r.kernel.org>
> > Signed-off-by: Paul E. McKenney <paulmck@...ux.ibm.com>
> > ---
> Acked-by: Edward Cree <ecree@...arflare.com>

Applied, thank you!

							Thanx, Paul

> >  drivers/net/ethernet/sfc/efx.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c
> > index 98fe7e762e17..3643015a55cf 100644
> > --- a/drivers/net/ethernet/sfc/efx.c
> > +++ b/drivers/net/ethernet/sfc/efx.c
> > @@ -3167,7 +3167,7 @@ struct hlist_head *efx_rps_hash_bucket(struct efx_nic *efx,
> >  {
> >  	u32 hash = efx_filter_spec_hash(spec);
> >  
> > -	WARN_ON(!spin_is_locked(&efx->rps_hash_lock));
> > +	lockdep_assert_held(&efx->rps_hash_lock);
> >  	if (!efx->rps_hash_table)
> >  		return NULL;
> >  	return &efx->rps_hash_table[hash % EFX_ARFS_HASH_TABLE_SIZE];
> 
>