Re: [PATCH tip/core/rcu 2/7] sfc: Replace spin_is_locked() with lockdep

[Edward Cree <ecree@solarflare.com>]

On 11/11/18 20:04, Paul E. McKenney wrote:
> From: Lance Roy <ldr709@gmail.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@gmail.com>
> Cc: Solarflare linux maintainers <linux-net-drivers@solarflare.com>
> Cc: Edward Cree <ecree@solarflare.com>
> Cc: Bert Kenward <bkenward@solarflare.com>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: <netdev@vger.kernel.org>
> Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
> ---
Acked-by: Edward Cree <ecree@solarflare.com>
>  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];