linux-kernel - Re: [PATCH net-next V6 2/2] net/mlx4

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Date:	Sun, 01 Jun 2014 21:16:50 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Amir Vadai <amirv@...lanox.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Or Gerlitz <ogerlitz@...lanox.com>, netdev@...r.kernel.org,
	Yevgeny Petrilin <yevgenyp@...lanox.com>,
	Yuval Atias <yuvala@...lanox.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next V6 2/2] net/mlx4_en: Use affinity hint

On Sun, 2014-05-25 at 17:47 +0300, Amir Vadai wrote:
> From: Yuval Atias <yuvala@...lanox.com>
> 
> The “affinity hint” mechanism is used by the user space
> daemon, irqbalancer, to indicate a preferred CPU mask for irqs.
> Irqbalancer can use this hint to balance the irqs between the
> cpus indicated by the mask.
> 
> We wish the HCA to preferentially map the IRQs it uses to numa cores
> close to it.  To accomplish this, we use cpumask_set_cpu_local_first(), that
> sets the affinity hint according the following policy:
> First it maps IRQs to “close” numa cores.  If these are exhausted, the
> remaining IRQs are mapped to “far” numa cores.
> 
> Signed-off-by: Yuval Atias <yuvala@...lanox.com>
> Signed-off-by: Amir Vadai <amirv@...lanox.com>
> ---

  CC [M]  drivers/net/ethernet/mellanox/mlx4/en_netdev.o
drivers/net/ethernet/mellanox/mlx4/en_netdev.c: In function ‘mlx4_en_init_affinity_hint’:
drivers/net/ethernet/mellanox/mlx4/en_netdev.c:1546:23: error: incompatible types when assigning to type ‘cpumask_var_t’ from type ‘void *’
drivers/net/ethernet/mellanox/mlx4/en_netdev.c: In function ‘mlx4_en_free_affinity_hint’:
drivers/net/ethernet/mellanox/mlx4/en_netdev.c:1553:41: error: incompatible types when assigning to type ‘cpumask_var_t’ from type ‘void *’


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