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Date: Sat, 9 Feb 2013 21:49:09 -0700
From: Jean Sacren <sakiwit@...il.com>
To: netdev@...r.kernel.org
Subject: [PATCH] skbuff: create skb_panic() to let caller specify panic
Combine skb_over_panic() and skb_under_panic() into skb_panic() and let
the caller specify whether it is skb_over_panic or skb_under_panic.
In skb_panic() definition, change 'int sz' and 'here' to 'unsigned int
size' and 'addr' for clarity, and accommodate the output message.
Rewrite kernel doc for skb_panic().
Signed-off-by: Jean Sacren <sakiwit@...il.com>
---
net/core/skbuff.c | 54 ++++++++++++++++++------------------------------------
1 file changed, 18 insertions(+), 36 deletions(-)
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 6114c11..e2cc214 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -104,48 +104,28 @@ static const struct pipe_buf_operations sock_pipe_buf_ops = {
.get = sock_pipe_buf_get,
};
-/*
- * Keep out-of-line to prevent kernel bloat.
- * __builtin_return_address is not used because it is not always
- * reliable.
- */
-
/**
- * skb_over_panic - private function
- * @skb: buffer
- * @sz: size
- * @here: address
- *
- * Out of line support code for skb_put(). Not user callable.
+ * skb_panic - private function for out-of-line support
+ * @skb: buffer
+ * @size: size
+ * @addr: address
+ * @panic: skb_over_panic or skb_under_panic
+ *
+ * Out-of-line support for skb_put() and skb_push(). Not user callable.
+ * Keep out of line to prevent kernel bloat.
+ * __builtin_return_address is not used because it is not always reliable.
*/
-static void skb_over_panic(struct sk_buff *skb, int sz, void *here)
+static void skb_panic(struct sk_buff *skb, unsigned int size, void *addr,
+ const char panic[])
{
- pr_emerg("%s: text:%p len:%d put:%d head:%p data:%p tail:%#lx end:%#lx dev:%s\n",
- __func__, here, skb->len, sz, skb->head, skb->data,
+ pr_emerg("%s: text:%p len:%d put:%d head:%p data:%p tail:%#lx "
+ "end:%#lx dev:%s\n",
+ panic, addr, skb->len, size, skb->head, skb->data,
(unsigned long)skb->tail, (unsigned long)skb->end,
skb->dev ? skb->dev->name : "<NULL>");
BUG();
}
-/**
- * skb_under_panic - private function
- * @skb: buffer
- * @sz: size
- * @here: address
- *
- * Out of line support code for skb_push(). Not user callable.
- */
-
-static void skb_under_panic(struct sk_buff *skb, int sz, void *here)
-{
- pr_emerg("%s: text:%p len:%d put:%d head:%p data:%p tail:%#lx end:%#lx dev:%s\n",
- __func__, here, skb->len, sz, skb->head, skb->data,
- (unsigned long)skb->tail, (unsigned long)skb->end,
- skb->dev ? skb->dev->name : "<NULL>");
- BUG();
-}
-
-
/*
* kmalloc_reserve is a wrapper around kmalloc_node_track_caller that tells
* the caller if emergency pfmemalloc reserves are being used. If it is and
@@ -1259,12 +1239,13 @@ EXPORT_SYMBOL(skb_pad);
*/
unsigned char *skb_put(struct sk_buff *skb, unsigned int len)
{
+ const char panic[] = "skb_over_panic";
unsigned char *tmp = skb_tail_pointer(skb);
SKB_LINEAR_ASSERT(skb);
skb->tail += len;
skb->len += len;
if (unlikely(skb->tail > skb->end))
- skb_over_panic(skb, len, __builtin_return_address(0));
+ skb_panic(skb, len, __builtin_return_address(0), panic);
return tmp;
}
EXPORT_SYMBOL(skb_put);
@@ -1280,10 +1261,11 @@ EXPORT_SYMBOL(skb_put);
*/
unsigned char *skb_push(struct sk_buff *skb, unsigned int len)
{
+ const char panic[] = "skb_under_panic";
skb->data -= len;
skb->len += len;
if (unlikely(skb->data<skb->head))
- skb_under_panic(skb, len, __builtin_return_address(0));
+ skb_panic(skb, len, __builtin_return_address(0), panic);
return skb->data;
}
EXPORT_SYMBOL(skb_push);
--
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