BUG: When building on RHEL 8, duplicate function

BUG: When building on RHEL 8, duplicate function

[D Neiroukh]

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I insmod’d the UDP tunnel module for both IPv4 and IPv6 then...

During a build on RHEL 8 I came across this:

In file included from <command-line>:
/home/****/WireGuard/src/compat/compat.h:815:20: error: redefinition of ‘skb_mark_not_on_list’
static inline void skb_mark_not_on_list(struct sk_buff *skb)
                    ^~~~~~~~~~~~~~~~~~~~
In file included from /home/****/WireGuard/src/compat/compat.h:777,
                 from <command-line>:
./include/linux/skbuff.h:1362:20: note: previous definition of ‘skb_mark_not_on_list’ was here
static inline void skb_mark_not_on_list(struct sk_buff *skb)
                    ^~~~~~~~~~~~~~~~~~~~
make[2]: *** [scripts/Makefile.build:316: /home/s34cr/WireGuard/src/main.o] Error 1
make[1]: *** [Makefile:1528: _module_/home/s34cr/WireGuard/src] Error 2
make: *** [Makefile:37: module] Error 2

I nullified the first definition:

#if 0
static inline void skb_mark_not_on_list(struct sk_buff *skb)
{
       skb->next = NULL;
}
#endif

And left the second (the include):
#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 1, 0)
#include <linux/skbuff.h> 
#define skb_probe_transport_header(a) skb_probe_transport_header(a, 0)
#endif

In order to build. I would like to state RHEL 8 builds with GCC 8.2.1 if that’s any help too. Seems I cannot connect, however. Will try removing the include in the second one.

Seems somewhere in between the RHEL kernel upgrade to 4.18 that function got added in.


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