compile error in netmap when moving from 6.12.12 to 6.12.17 kernel

[vatsa3]

Getting the following error. NETMAP_LINUX_HAVE_AX25PTR is defined.

=== compile log relevant===

sys/dev/netmap/netmap_kern.h:1643:18: error: assignment to ‘struct ax25_dev *’ from incompatible pointer type ‘struct netmap_adapter *’ [-Wincompatible-pointer-types]
1643 | WNA(ifp) = na;
Probably our build system have --Wincompatible-pointer-types throw error. Any good way to fix this other than ignoring -Werror?

overloading ax25_ptr is causing build failures on newer kernels I am guessing. possibly more stricter compile check in 6.12.17.

This is the workaround I currently have

diff --git a/sys/dev/netmap/netmap_kern.h b/sys/dev/netmap/netmap_kern.h
index fea2f820..68c93731 100644
--- a/sys/dev/netmap/netmap_kern.h
+++ b/sys/dev/netmap/netmap_kern.h
@@ -1640,12 +1640,12 @@ extern int netmap_generic_txqdisc;
        ((uint32_t)(uintptr_t)NA(ifp) ^ NA(ifp)->magic) == NETMAP_MAGIC )
 
 #define        NM_ATTACH_NA(ifp, na) do {                                      \
-       WNA(ifp) = na;                                                  \
+       WNA(ifp) = (void *)na;                                                  \
        if (NA(ifp))                                                    \
                NA(ifp)->magic =                                        \
                        ((uint32_t)(uintptr_t)NA(ifp)) ^ NETMAP_MAGIC;  \
 } while(0)
-#define NM_RESTORE_NA(ifp, na)         WNA(ifp) = na;
+#define NM_RESTORE_NA(ifp, na)         WNA(ifp) = (void *)na;
 
 #define NM_DETACH_NA(ifp)      do { WNA(ifp) = NULL; } while (0)
 #define NM_NA_CLASH(ifp)       (NA(ifp) && !NM_NA_VALID(ifp))

[giuseppelettieri]

In fact, it is better not to use this pointer at all, i.e., let the test for NETMAP_LINUX_HAVE_AX25PTR fail. This was the intent of commit cb299c5. Have you tried it yet?