Re: [B.A.T.M.A.N.] [PATCHv12 2/4] batman-adv: Add multicast optimization support for bridged setups

[Sven Eckelmann <sven@narfation.org>]

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On Wednesday 16 March 2016 05:06:43 Linus Lüssing wrote:
> --- /dev/null
> +++ b/compat-sources/net/bridge/br_multicast.c
> @@ -0,0 +1,33 @@
> +#include <linux/if_bridge.h>
> +#include <linux/printk.h>
> +
> +#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0) || \
> +    LINUX_VERSION_CODE == KERNEL_VERSION(3, 16, 0) && \
> +       (!IS_ENABLED(CONFIG_BRIDGE) || \
> +       !IS_ENABLED(CONFIG_BRIDGE_IGMP_SNOOPING))
> +
> +int br_multicast_list_adjacent(struct net_device *dev,
> +                              struct list_head *br_ip_list)
> +{
> +       return 0;
> +}
> +
> +bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
> +{
> +       return false;
> +}
> +
> +#endif /* < KERNEL_VERSION(3, 16, 0) ||
> +       * !IS_ENABLED(CONFIG_BRIDGE) ||
> +       * !IS_ENABLED(CONFIG_BRIDGE_IGMP_SNOOPING) */
> +
> +#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 17, 0)
> +
> +bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
> +{
> +       pr_warn_once("Old kernel detected (< 3.17) - multicast optimizations disabled\n");
> +
> +       return false;
> +}
> +
> +#endif /* < KERNEL_VERSION(3, 17, 0) */

Why must there be a special compat-sources/*.c file for these tiny
functions?

Kind regards,
	Sven

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