linux-kernel - Re: [RFC PATCH net-next 06/12] tuntap: enable premmption early

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Message-ID: <20180521173230-mutt-send-email-mst@kernel.org>
Date:   Mon, 21 May 2018 17:32:38 +0300
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH net-next 06/12] tuntap: enable premmption early

On Mon, May 21, 2018 at 05:04:27PM +0800, Jason Wang wrote:
> Signed-off-by: Jason Wang <jasowang@...hat.com>

typo in subject

> ---
>  drivers/net/tun.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/tun.c b/drivers/net/tun.c
> index 44d4f3d..24ecd82 100644
> --- a/drivers/net/tun.c
> +++ b/drivers/net/tun.c
> @@ -1697,6 +1697,8 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun,
>  			goto err_xdp;
>  		}
>  	}
> +	rcu_read_unlock();
> +	preempt_enable();
>  
>  	skb = build_skb(buf, buflen);
>  	if (!skb) {
> @@ -1710,9 +1712,6 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun,
>  	get_page(alloc_frag->page);
>  	alloc_frag->offset += buflen;
>  
> -	rcu_read_unlock();
> -	preempt_enable();
> -
>  	return skb;
>  
>  err_redirect:
> -- 
> 2.7.4