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authorJohannes Berg <johannes.berg@intel.com>2017-06-16 14:29:24 +0200
committerDavid S. Miller <davem@davemloft.net>2017-06-16 17:48:40 +0200
commit634fef61076d644b989b86abc2f560d81a089a31 (patch)
tree41e0cfc0c640666a75ad07588df34addb18176d0 /include
parentnetworking: make skb_push & __skb_push return void pointers (diff)
downloadlinux-634fef61076d644b989b86abc2f560d81a089a31.tar.xz
linux-634fef61076d644b989b86abc2f560d81a089a31.zip
networking: add and use skb_put_u8()
Joe and Bjørn suggested that it'd be nicer to not have the cast in the fairly common case of doing *(u8 *)skb_put(skb, 1) = c; Add skb_put_u8() for this case, and use it across the code, using the following spatch: @@ expression SKB, C, S; typedef u8; identifier fn = {skb_put}; fresh identifier fn2 = fn ## "_u8"; @@ - *(u8 *)fn(SKB, S) = C; + fn2(SKB, C); Note that due to the "S", the spatch isn't perfect, it should have checked that S is 1, but there's also places that use a sizeof expression like sizeof(var) or sizeof(u8) etc. Turns out that nobody ever did something like *(u8 *)skb_put(skb, 2) = c; which would be wrong anyway since the second byte wouldn't be initialized. Suggested-by: Joe Perches <joe@perches.com> Suggested-by: Bjørn Mork <bjorn@mork.no> Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/linux/skbuff.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 46bd514e719c..852feacf4bbf 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1923,6 +1923,11 @@ static inline void *skb_put_data(struct sk_buff *skb, const void *data,
return tmp;
}
+static inline void skb_put_u8(struct sk_buff *skb, u8 val)
+{
+ *(u8 *)skb_put(skb, 1) = val;
+}
+
void *skb_push(struct sk_buff *skb, unsigned int len);
static inline void *__skb_push(struct sk_buff *skb, unsigned int len)
{