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[v3,net-next,2/6] skbuff: make __skb_header_pointer()'s data argument const

Message ID 20210314111027.7657-3-alobakin@pm.me
State New
Headers show
Series skbuff: micro-optimize flow dissection | expand

Commit Message

Alexander Lobakin March 14, 2021, 11:11 a.m. UTC 
The function never modifies the input buffer, so 'data' argument
can be marked as const.
This implies one harmless cast-away.

Signed-off-by: Alexander Lobakin <alobakin@pm.me>
---
 include/linux/skbuff.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--
2.30.2
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Patch

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 483e89348f78..d6ea3dc3eddb 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -3678,11 +3678,11 @@  __wsum skb_checksum(const struct sk_buff *skb, int offset, int len,
 		    __wsum csum);

 static inline void * __must_check
-__skb_header_pointer(const struct sk_buff *skb, int offset,
-		     int len, void *data, int hlen, void *buffer)
+__skb_header_pointer(const struct sk_buff *skb, int offset, int len,
+		     const void *data, int hlen, void *buffer)
 {
 	if (hlen - offset >= len)
-		return data + offset;
+		return (void *)data + offset;

 	if (!skb ||
 	    skb_copy_bits(skb, offset, buffer, len) < 0)