netdev - Re: [PATCH] net/mlx4: Use cpumask_available for eq->affinity

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Date:   Sun, 23 Sep 2018 10:52:02 +0300
From:   Tariq Toukan <tariqt@...lanox.com>
To:     Nathan Chancellor <natechancellor@...il.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net/mlx4: Use cpumask_available for eq->affinity_mask



On 21/09/2018 12:44 PM, Nathan Chancellor wrote:
> Clang warns that the address of a pointer will always evaluated as true
> in a boolean context:
> 
> drivers/net/ethernet/mellanox/mlx4/eq.c:243:11: warning: address of
> array 'eq->affinity_mask' will always evaluate to 'true'
> [-Wpointer-bool-conversion]
>          if (!eq->affinity_mask || cpumask_empty(eq->affinity_mask))
>              ~~~~~^~~~~~~~~~~~~
> 1 warning generated.
> 
> Use cpumask_available, introduced in commit f7e30f01a9e2 ("cpumask: Add
> helper cpumask_available()"), which does the proper checking and avoids
> this warning.
> 
> Link: https://github.com/ClangBuiltLinux/linux/issues/86
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> ---
>   drivers/net/ethernet/mellanox/mlx4/eq.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx4/eq.c b/drivers/net/ethernet/mellanox/mlx4/eq.c
> index 1f3372c1802e..2df92dbd38e1 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/eq.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/eq.c
> @@ -240,7 +240,8 @@ static void mlx4_set_eq_affinity_hint(struct mlx4_priv *priv, int vec)
>   	struct mlx4_dev *dev = &priv->dev;
>   	struct mlx4_eq *eq = &priv->eq_table.eq[vec];
>   
> -	if (!eq->affinity_mask || cpumask_empty(eq->affinity_mask))
> +	if (!cpumask_available(eq->affinity_mask) ||
> +	    cpumask_empty(eq->affinity_mask))
>   		return;
>   
>   	hint_err = irq_set_affinity_hint(eq->irq, eq->affinity_mask);
> 

Reviewed-by: Tariq Toukan <tariqt@...lanox.com>
Thanks.