On Mon, Jan 26, 2026 at 6:29 PM Mark Brown [off-list ref] wrote:

Hi all,

After merging the net-next tree, today's linux-next build (arm64
defconfig) failed like this:

/tmp/next/build/net/core/sysctl_net_core.c: In function 'proc_do_rss_key':
/tmp/next/build/net/core/sysctl_net_core.c:333:23: error: implicit declaration of function 'hex_byte_pack' [-Wimplicit-function-declaration]
  333 |                 pos = hex_byte_pack(pos, netdev_rss_key[i]);
      |                       ^~~~~~~~~~~~~
/tmp/next/build/net/core/sysctl_net_core.c:333:21: error: assignment to 'char *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
  333 |                 pos = hex_byte_pack(pos, netdev_rss_key[i]);
      |                     ^

Caused by commit

   37b0ea8fef56c (net: expand NETDEV_RSS_KEY_LEN to 256 bytes)

I have used the tree from 20260123 instead.

I will send this fix then, thank you

diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index 0f761d4b9447..03aea10073f0 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c

@@ -17,6 +17,7 @@
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/sched/isolation.h>
+#include <linux/hex.h>

 #include <net/ip.h>
 #include <net/sock.h>