netdev - Re: [PATCH 10/17] netvm: Allow skb allocation to use PFMEMALLOC reserves

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Message-ID: <20120622100032.GB8271@suse.de>
Date:	Fri, 22 Jun 2012 11:00:32 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>,
	Linux-Netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>, Neil Brown <neilb@...e.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Christie <michaelc@...wisc.edu>,
	Eric B Munson <emunson@...bm.net>
Subject: Re: [PATCH 10/17] netvm: Allow skb allocation to use PFMEMALLOC
 reserves

On Thu, Jun 21, 2012 at 06:09:02PM +0200, Sebastian Andrzej Siewior wrote:
> > <SNIP>
> >
> If merge this chunk
> 
> diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> index 6510a5d..2acfec9 100644
> --- a/include/linux/skbuff.h
> +++ b/include/linux/skbuff.h
> @@ -510,7 +510,7 @@ struct sk_buff {
>  #define SKB_ALLOC_RX		0x02
>  
>  /* Returns true if the skb was allocated from PFMEMALLOC reserves */
> -static inline bool skb_pfmemalloc(struct sk_buff *skb)
> +static inline bool skb_pfmemalloc(const struct sk_buff *skb)
>  {
>  	return unlikely(skb->pfmemalloc);
>  }
> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> index c44ab68..6ce94b5 100644
> --- a/net/core/skbuff.c
> +++ b/net/core/skbuff.c
> @@ -852,7 +852,7 @@ static void copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
>  
>  static inline int skb_alloc_rx_flag(const struct sk_buff *skb)
>  {
> -	if (skb_pfmemalloc((struct sk_buff *)skb))
> +	if (skb_pfmemalloc(skb))
>  		return SKB_ALLOC_RX;
>  	return 0;
>  }
> 
> 
> Then you should be able to drop the case in skb_alloc_rx_flag() without adding
> a warning.
> 

You're right. Thanks.

-- 
Mel Gorman
SUSE Labs
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