net: core: Assert the size of netdev_featres_t
We have about 53 netdev_features_t bits defined and counting, add a
build time check to catch when an u64 type will not be enough and we
will have to convert that to a bitmap. This is done in
register_netdevice() for convenience.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 82f5a9a..9e09dd8 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -4108,6 +4108,12 @@
void linkwatch_run_queue(void);
+static inline void netdev_features_size_check(void)
+{
+ BUILD_BUG_ON(sizeof(netdev_features_t) * BITS_PER_BYTE <
+ NETDEV_FEATURE_COUNT);
+}
+
static inline netdev_features_t netdev_intersect_features(netdev_features_t f1,
netdev_features_t f2)
{
diff --git a/net/core/dev.c b/net/core/dev.c
index 25ceecf..e01c21a 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -7879,6 +7879,7 @@
int ret;
struct net *net = dev_net(dev);
+ netdev_features_size_check();
BUG_ON(dev_boot_phase);
ASSERT_RTNL();