netdev - Re: [PATCH 13/24] [IPSEC]: Move x->outer_mode->output out of locked section

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Date:	Wed, 7 Nov 2007 17:17:42 +0100
From:	Ingo Oeser <netdev@...eo.de>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH 13/24] [IPSEC]: Move x->outer_mode->output out of locked section

Hi Herbert,

Herbert Xu schrieb:
> diff --git a/net/ipv6/xfrm6_mode_ro.c b/net/ipv6/xfrm6_mode_ro.c
> index a7bc8c6..4a01cb3 100644
> --- a/net/ipv6/xfrm6_mode_ro.c
> +++ b/net/ipv6/xfrm6_mode_ro.c
> @@ -53,7 +54,9 @@ static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb)
>  	__skb_pull(skb, hdr_len);
>  	memmove(ipv6_hdr(skb), iph, hdr_len);
>  
> +	spin_lock_bh(&x->lock);
>  	x->lastused = get_seconds();
> +	spin_unlock_bh(&x->lock);
>  
>  	return 0;
>  }

Can you move the retrieval of the seconds outside the spinlock?

e.g.

tmp = get_seconds();
spin_lock_bh(&x->lock);
x->lastused = tmp;
spin_unlock_bh(&x->lock);

or is it not really worth it?

Best Regards

Ingo Oeser
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