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| author | David S. Miller <davem@davemloft.net> | 2009-02-17 21:24:05 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-02-17 21:24:05 -0800 |
| commit | 92a0acce186cde8ead56c6915d9479773673ea1a (patch) | |
| tree | 97b7663f77f8274cb52d429c8a7db97c70daf745 | |
| parent | 34edaa88324004baf4884fb0388f86059d9c4878 (diff) | |
| download | kernel_samsung_crespo-92a0acce186cde8ead56c6915d9479773673ea1a.zip kernel_samsung_crespo-92a0acce186cde8ead56c6915d9479773673ea1a.tar.gz kernel_samsung_crespo-92a0acce186cde8ead56c6915d9479773673ea1a.tar.bz2 | |
net: Kill skb_truesize_check(), it only catches false-positives.
A long time ago we had bugs, primarily in TCP, where we would modify
skb->truesize (for TSO queue collapsing) in ways which would corrupt
the socket memory accounting.
skb_truesize_check() was added in order to try and catch this error
more systematically.
However this debugging check has morphed into a Frankenstein of sorts
and these days it does nothing other than catch false-positives.
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/linux/skbuff.h | 9 | ||||
| -rw-r--r-- | include/net/sock.h | 1 | ||||
| -rw-r--r-- | net/core/skbuff.c | 8 | ||||
| -rw-r--r-- | net/core/sock.c | 1 |
4 files changed, 0 insertions, 19 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index cf2cb50..9dcf956 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -416,15 +416,6 @@ extern void skb_over_panic(struct sk_buff *skb, int len, void *here); extern void skb_under_panic(struct sk_buff *skb, int len, void *here); -extern void skb_truesize_bug(struct sk_buff *skb); - -static inline void skb_truesize_check(struct sk_buff *skb) -{ - int len = sizeof(struct sk_buff) + skb->len; - - if (unlikely((int)skb->truesize < len)) - skb_truesize_bug(skb); -} extern int skb_append_datato_frags(struct sock *sk, struct sk_buff *skb, int getfrag(void *from, char *to, int offset, diff --git a/include/net/sock.h b/include/net/sock.h index ce3b5b6..eefeeaf 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -860,7 +860,6 @@ static inline void sk_mem_uncharge(struct sock *sk, int size) static inline void sk_wmem_free_skb(struct sock *sk, struct sk_buff *skb) { - skb_truesize_check(skb); sock_set_flag(sk, SOCK_QUEUE_SHRUNK); sk->sk_wmem_queued -= skb->truesize; sk_mem_uncharge(sk, skb->truesize); diff --git a/net/core/skbuff.c b/net/core/skbuff.c index da74b84..c6a6b16 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -143,14 +143,6 @@ void skb_under_panic(struct sk_buff *skb, int sz, void *here) BUG(); } -void skb_truesize_bug(struct sk_buff *skb) -{ - WARN(net_ratelimit(), KERN_ERR "SKB BUG: Invalid truesize (%u) " - "len=%u, sizeof(sk_buff)=%Zd\n", - skb->truesize, skb->len, sizeof(struct sk_buff)); -} -EXPORT_SYMBOL(skb_truesize_bug); - /* Allocate a new skbuff. We do this ourselves so we can fill in a few * 'private' fields and also do memory statistics to find all the * [BEEP] leaks. diff --git a/net/core/sock.c b/net/core/sock.c index 6f2e133..6e4f14d 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -1137,7 +1137,6 @@ void sock_rfree(struct sk_buff *skb) { struct sock *sk = skb->sk; - skb_truesize_check(skb); atomic_sub(skb->truesize, &sk->sk_rmem_alloc); sk_mem_uncharge(skb->sk, skb->truesize); } |