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GCC can replace a strncat() call with constant second argument into a strlen + store, which results in a link error: ERROR: "strlen" [net/ipv4/ip_tunnel.ko] undefined! The inline function is a simple for loop in C. Other architectures either use an asm optimized variant, or use the generic function from lib/string.c. Reported-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Michal Marek <mmarek@suse.cz> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>