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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>
This commit is contained in:
Florian Fainelli 2018-04-27 13:11:14 -07:00 committed by David S. Miller
parent c1b28847f7
commit 3ac305c386
2 changed files with 7 additions and 0 deletions
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6
include/linux/netdevice.h
View File

@ -4108,6 +4108,12 @@ const char *netdev_drivername(const struct net_device *dev);
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)
{

1
net/core/dev.c
View File

@ -7879,6 +7879,7 @@ int register_netdevice(struct net_device *dev)
int ret;
struct net *net = dev_net(dev);
netdev_features_size_check();
BUG_ON(dev_boot_phase);
ASSERT_RTNL();