The serial.h is missing for the sparc architecture:
sparc64-linux-gcc -Wp,-MD,drivers/serial/.8250.o.d -D__KERNEL__
-Iinclude -Wall -Wstrict-prototypes -Wno-trigraphs -O2
-fno-strict-aliasing -fno-common -m64 -pipe -mno-fpu -mcpu=ultrasparc
-mcmodel=medlow -ffixed-g4 -fcall-used-g5 -fcall-used-g7 -Wno-sign-compare
-Wa,--undeclared-regs -pg -nostdinc -iwithprefix include
-DKBUILD_BASENAME=8250 -DEXPORT_SYMTAB -c -o drivers/serial/8250.o
drivers/serial/8250.c
drivers/serial/8250.c:104: asm/serial.h: No such file or directory
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