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Commit 231d06ae authored by Jörn Engel's avatar Jörn Engel Committed by David S. Miller
Browse files

[NET]: Uninline kfree_skb and allow NULL argument 



o Uninline kfree_skb, which saves some 15k of object code on my notebook.

o Allow kfree_skb to be called with a NULL argument.

  Subsequent patches can remove conditional from drivers and further
  reduce source and object size.

Signed-off-by: default avatarJrn Engel <joern@wohnheim.fh-wedel.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2e1f47c7

include/linux/skbuff.h

+1 −16
Original line number Diff line number Diff line
@@ -304,6 +304,7 @@ struct sk_buff { 


#include <asm/system.h>



extern void kfree_skb(struct sk_buff *skb);

extern void	       __kfree_skb(struct sk_buff *skb);

extern struct sk_buff *__alloc_skb(unsigned int size,

				   gfp_t priority, int fclone);
@@ -403,22 +404,6 @@ static inline struct sk_buff *skb_get(struct sk_buff *skb) 
 * atomic change.

 */



/**

 *	kfree_skb - free an sk_buff

 *	@skb: buffer to free

 *

 *	Drop a reference to the buffer and free it if the usage count has

 *	hit zero.

 */

static inline void kfree_skb(struct sk_buff *skb)

{

	if (likely(atomic_read(&skb->users) == 1))

		smp_rmb();

	else if (likely(!atomic_dec_and_test(&skb->users)))

		return;

	__kfree_skb(skb);

}



/**

 *	skb_cloned - is the buffer a clone

 *	@skb: buffer to check

net/core/skbuff.c

+19 −0
Original line number Diff line number Diff line
@@ -355,6 +355,24 @@ void __kfree_skb(struct sk_buff *skb) 
	kfree_skbmem(skb);

}



/**

 *	kfree_skb - free an sk_buff

 *	@skb: buffer to free

 *

 *	Drop a reference to the buffer and free it if the usage count has

 *	hit zero.

 */

void kfree_skb(struct sk_buff *skb)

{

	if (unlikely(!skb))

		return;

	if (likely(atomic_read(&skb->users) == 1))

		smp_rmb();

	else if (likely(!atomic_dec_and_test(&skb->users)))

		return;

	__kfree_skb(skb);

}



/**

 *	skb_clone	-	duplicate an sk_buff

 *	@skb: buffer to clone
@@ -1799,6 +1817,7 @@ void __init skb_init(void) 


EXPORT_SYMBOL(___pskb_trim);

EXPORT_SYMBOL(__kfree_skb);

EXPORT_SYMBOL(kfree_skb);

EXPORT_SYMBOL(__pskb_pull_tail);

EXPORT_SYMBOL(__alloc_skb);

EXPORT_SYMBOL(pskb_copy);