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net: Revert "net: add function to allocate sk_buff head without data area"

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It was added for netlink mmap tx, there are no callers in the tree.
The commit also added a check for skb->head != NULL in kfree_skb path,
remove that too -- all skbs ought to have skb->head set.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2017-07-17 18:56:54 +02:00 committed by David S. Miller
parent 5c3c6081b2
commit 06dc75ab06
2 changed files with 2 additions and 35 deletions
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6
include/linux/skbuff.h
View File

@ -944,12 +944,6 @@ static inline struct sk_buff *alloc_skb_fclone(unsigned int size,
return __alloc_skb(size, priority, SKB_ALLOC_FCLONE, NUMA_NO_NODE);
}
struct sk_buff *__alloc_skb_head(gfp_t priority, int node);
static inline struct sk_buff *alloc_skb_head(gfp_t priority)
{
return __alloc_skb_head(priority, -1);
}
struct sk_buff *skb_morph(struct sk_buff *dst, struct sk_buff *src);
int skb_copy_ubufs(struct sk_buff *skb, gfp_t gfp_mask);
struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t priority);

31
net/core/skbuff.c
View File

@ -158,31 +158,6 @@ static void *__kmalloc_reserve(size_t size, gfp_t flags, int node,
*
*/
struct sk_buff *__alloc_skb_head(gfp_t gfp_mask, int node)
{
struct sk_buff *skb;
/* Get the HEAD */
skb = kmem_cache_alloc_node(skbuff_head_cache,
gfp_mask & ~__GFP_DMA, node);
if (!skb)
goto out;
/*
* Only clear those fields we need to clear, not those that we will
* actually initialise below. Hence, don't put any more fields after
* the tail pointer in struct sk_buff!
*/
memset(skb, 0, offsetof(struct sk_buff, tail));
skb->head = NULL;
skb->truesize = sizeof(struct sk_buff);
refcount_set(&skb->users, 1);
skb->mac_header = (typeof(skb->mac_header))~0U;
out:
return skb;
}
/**
* __alloc_skb - allocate a network buffer
* @size: size to allocate
@ -663,8 +638,7 @@ void skb_release_head_state(struct sk_buff *skb)
static void skb_release_all(struct sk_buff *skb)
{
skb_release_head_state(skb);
if (likely(skb->head))
skb_release_data(skb);
skb_release_data(skb);
}
/**
@ -762,8 +736,7 @@ void consume_stateless_skb(struct sk_buff *skb)
return;
trace_consume_skb(skb);
if (likely(skb->head))
skb_release_data(skb);
skb_release_data(skb);
kfree_skbmem(skb);
}