[Qemu-devel] [PATCH] net: Constify the checksum functions

[Benjamin Herrenschmidt]

They never touch the buffer, it should be const, this helps when
drivers want to pass const pointers.

This is purely signature changes, there are no actual code changes.

Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org>
---
 include/net/checksum.h | 10 +++++-----
 net/checksum.c         |  6 +++---
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/include/net/checksum.h b/include/net/checksum.h
index 7df472c..091f547 100644
--- a/include/net/checksum.h
+++ b/include/net/checksum.h
@@ -21,20 +21,20 @@
 #include "qemu/bswap.h"
 struct iovec;
 
-uint32_t net_checksum_add_cont(int len, uint8_t *buf, int seq);
+uint32_t net_checksum_add_cont(int len, const uint8_t *buf, int seq);
 uint16_t net_checksum_finish(uint32_t sum);
 uint16_t net_checksum_tcpudp(uint16_t length, uint16_t proto,
-                             uint8_t *addrs, uint8_t *buf);
-void net_checksum_calculate(uint8_t *data, int length);
+                             const uint8_t *addrs, const uint8_t *buf);
+void net_checksum_calculate(const uint8_t *data, int length);
 
 static inline uint32_t
-net_checksum_add(int len, uint8_t *buf)
+net_checksum_add(int len, const uint8_t *buf)
 {
     return net_checksum_add_cont(len, buf, 0);
 }
 
 static inline uint16_t
-net_raw_checksum(uint8_t *data, int length)
+net_raw_checksum(const uint8_t *data, int length)
 {
     return net_checksum_finish(net_checksum_add(length, data));
 }
diff --git a/net/checksum.c b/net/checksum.c
index 23323b0..2da95bd 100644
--- a/net/checksum.c
+++ b/net/checksum.c
@@ -20,7 +20,7 @@
 #include "net/checksum.h"
 #include "net/eth.h"
 
-uint32_t net_checksum_add_cont(int len, uint8_t *buf, int seq)
+uint32_t net_checksum_add_cont(int len, const uint8_t *buf, int seq)
 {
     uint32_t sum = 0;
     int i;
@@ -43,7 +43,7 @@ uint16_t net_checksum_finish(uint32_t sum)
 }
 
 uint16_t net_checksum_tcpudp(uint16_t length, uint16_t proto,
-                             uint8_t *addrs, uint8_t *buf)
+                             const uint8_t *addrs, const uint8_t *buf)
 {
     uint32_t sum = 0;
 
@@ -53,7 +53,7 @@ uint16_t net_checksum_tcpudp(uint16_t length, uint16_t proto,
     return net_checksum_finish(sum);
 }
 
-void net_checksum_calculate(uint8_t *data, int length)
+void net_checksum_calculate(const uint8_t *data, int length)
 {
     int mac_hdr_len, ip_len;
     struct ip_header *ip;