netdev - Re: [PATCH net-2.6.26 2/2] Do not allocate unneeded memory for dev->priv alignment.

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Message-ID: <47FA5D62.5040806@gmail.com>
Date:	Mon, 07 Apr 2008 19:44:02 +0200
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Pavel Emelyanov <xemul@...nvz.org>
CC:	Linux Netdev List <netdev@...r.kernel.org>,
	Stephen Hemminger <shemminger@...tta.com>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH net-2.6.26 2/2] Do not allocate unneeded memory for dev->priv
   alignment.

Pavel Emelyanov wrote, On 04/07/2008 06:31 PM:
...

> ---
>  net/core/dev.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/net/core/dev.c b/net/core/dev.c
> index 7aa0112..80e103a 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -4000,7 +4000,8 @@ struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
>  	alloc_size = (sizeof(*dev) + NETDEV_ALIGN_CONST +
>  		     (sizeof(struct net_device_subqueue) * (queue_count - 1))) &
>  		     ~NETDEV_ALIGN_CONST;
> -	alloc_size += sizeof_priv + NETDEV_ALIGN_CONST;
> +	if (sizeof_priv)
> +		alloc_size += sizeof_priv + NETDEV_ALIGN_CONST;
>  
>  	p = kzalloc(alloc_size, GFP_KERNEL);
>  	if (!p) {


IMHO this second "+ NETDEV_ALIGN_CONST" is needed here because of "~NETDEV_ALIGN_CONST".

Regards,
Jarek P.
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