[10/17] netvm: Allow skb allocation to use PFMEMALLOC reserves

On Wed, Jun 20, 2012 at 12:44:05PM +0100, Mel Gorman wrote:
> index b534a1b..61c951f 100644
> --- a/include/linux/skbuff.h
> +++ b/include/linux/skbuff.h
> @@ -505,6 +506,15 @@ struct sk_buff {
>  #include <linux/slab.h>
>  
>  
> +#define SKB_ALLOC_FCLONE	0x01
> +#define SKB_ALLOC_RX		0x02
> +
> +/* Returns true if the skb was allocated from PFMEMALLOC reserves */
> +static inline bool skb_pfmemalloc(struct sk_buff *skb)
> +{
> +	return unlikely(skb->pfmemalloc);
> +}
> +
>  /*
>   * skb might have a dst pointer attached, refcounted or not.
>   * _skb_refdst low order bit is set if refcount was _not_ taken
> @@ -568,7 +578,7 @@ extern bool skb_try_coalesce(struct sk_buff *to, struct sk_buff *from,
> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> index 1d6ecc8..9a58dcc 100644
> --- a/net/core/skbuff.c
> +++ b/net/core/skbuff.c
> @@ -839,6 +900,13 @@ static void copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
>  	skb_shinfo(new)->gso_type = skb_shinfo(old)->gso_type;
>  }
>  
> +static inline int skb_alloc_rx_flag(const struct sk_buff *skb)
> +{
> +	if (skb_pfmemalloc((struct sk_buff *)skb))
> +		return SKB_ALLOC_RX;
> +	return 0;
> +}
> +
>  /**
>   *	skb_copy	-	create private copy of an sk_buff
>   *	@skb: buffer to copy

If merge this chunk



Then you should be able to drop the case in skb_alloc_rx_flag() without adding
a warning.

Sebastian
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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.