This commit restructures the compat code regarding cfg80211 to achieve the following:

a) Allows to compile kernels < 3.16 with -Werror by replacing the "#warning" with a runtime warning through pr_warn_once(). b) Allows to run < 3.16 kernels without warnings if no cfg80211 based interface is used. c) Migrates cfg80211 compat code from compat.h to compat cfg80211.h to keep compat.h slim.

Signed-off-by: Linus Lüssing linus.luessing@c0d3.blue --- compat-include/net/cfg80211.h | 21 ++++++++++++++++++++- compat.h | 21 --------------------- 2 files changed, 20 insertions(+), 22 deletions(-)

diff --git a/compat-include/net/cfg80211.h b/compat-include/net/cfg80211.h index 8dbbf0e..6e0eca3 100644 --- a/compat-include/net/cfg80211.h +++ b/compat-include/net/cfg80211.h @@ -4,9 +4,28 @@ #include <linux/version.h> #include_next <net/cfg80211.h>

+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0) + +static inline int cfg80211_get_station(struct net_device *dev, + const u8 *mac_addr, + struct station_info *sinfo) +{ + pr_warn_once("cfg80211 based throughput metric is only supported with Linux 3.16+\n"); + return -ENOENT; +} + +/* The following define substitutes the expected_throughput field with a random + * one existing in the station_info struct. It can be random because due to the + * function above it will never be used. Only needed to make the code compile + */ +#define expected_throughput filled + +#endif /* < KERNEL_VERSION(3, 16, 0) */ + #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0)

-#if !IS_ENABLED(CONFIG_CFG80211) +#if !IS_ENABLED(CONFIG_CFG80211) && \ + LINUX_VERSION_CODE >= KERNEL_VERSION(3, 16, 0)

#define cfg80211_get_station(dev, mac_addr, sinfo) \ batadv_cfg80211_get_station(dev, mac_addr, sinfo) diff --git a/compat.h b/compat.h index 5397629..e43c413 100644 --- a/compat.h +++ b/compat.h @@ -130,27 +130,6 @@ static int __batadv_interface_kill_vid(struct net_device *dev, __be16 proto,\

#endif /* < KERNEL_VERSION(3, 10, 0) */

-#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0) - -/* the expected behaviour of this function is to return 0 on success, therefore - * it is possible to define it as 1 so that batman-adv thinks like something - * went wrong. It will then decide what to do. - */ -#define cfg80211_get_station(_a, _b, _c) (1) -/* the following define substitute the expected_throughput field with a random - * one existing in the station_info struct. It can be random because due to the - * define above it will never be used. We need it only to make the code compile - */ -#define expected_throughput filled - -#ifdef CONFIG_BATMAN_ADV_BATMAN_V - -#warning cfg80211 based throughput metric is only supported with Linux 3.15+ - -#endif - -#endif /* < KERNEL_VERSION(3, 16, 0) */ - #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 0, 0)

/* wild hack for batadv_getlink_net only */