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A simple change from an if() to a macro and I'm on my merry way. Not sure if you want anything more than that. In file included from ./include/asm-generic/bug.h:22, from ./arch/arm/include/asm/bug.h:60, from ./include/linux/bug.h:5, from ./include/linux/mmdebug.h:5, from ./include/linux/mm.h:6, from net/ipv4/tcp_input.c:67: net/ipv4/tcp_input.c: In function ‘tcp_syn_flood_action’: ./include/net/sock.h:387:37: error: ‘const struct sock_common’ has no member named ‘skc_v6_rcv_saddr’; did you mean ‘skc_rcv_saddr’? 387 | #define sk_v6_rcv_saddr __sk_common.skc_v6_rcv_saddr | ^~~~~~~~~~~~~~~~ ./include/linux/printk.h:429:19: note: in definition of macro ‘printk_index_wrap’ 429 | _p_func(_fmt, ##__VA_ARGS__); \ | ^~~~~~~~~~~ ./include/linux/printk.h:530:2: note: in expansion of macro ‘printk’ 530 | printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~ ./include/linux/net.h:272:3: note: in expansion of macro ‘pr_info’ 272 | function(__VA_ARGS__); \ | ^~~~~~~~ ./include/linux/net.h:288:2: note: in expansion of macro ‘net_ratelimited_function’ 288 | net_ratelimited_function(pr_info, fmt, ##__VA_ARGS__) | ^~~~~~~~~~~~~~~~~~~~~~~~ ./include/linux/net.h:288:43: note: in expansion of macro ‘sk_v6_rcv_saddr’ 288 | net_ratelimited_function(pr_info, fmt, ##__VA_ARGS__) | ^~~~~~~~~~~ net/ipv4/tcp_input.c:6847:4: note: in expansion of macro ‘net_info_ratelimited’ 6847 | net_info_ratelimited("%s: Possible SYN flooding on port [%pI6c]:%u. %s.\n", | ^~~~~~~~~~~~~~~~~~~~ CC net/ipv4/icmp.o make[3]: *** [scripts/Makefile.build:250: net/ipv4/tcp_input.o] Error 1 make[3]: *** Waiting for unfinished jobs.... make[2]: *** [scripts/Makefile.build:500: net/ipv4] Error 2 make[1]: *** [scripts/Makefile.build:500: net] Error 2 make: *** [Makefile:1992: .] Error 2