Index: sys/modules/linux/Makefile
===================================================================
--- sys/modules/linux/Makefile
+++ sys/modules/linux/Makefile
@@ -102,9 +102,10 @@
 	${STRIPBIN} -N _binary_linux${SFX}_vdso_so_o_size ${.TARGET}
 
 .if ${MACHINE_CPUARCH} == "amd64"
-linux${SFX}_support.o: linux${SFX}_assym.h assym.inc
+linux${SFX}_support.o: linux${SFX}_support.s linux${SFX}_assym.h assym.inc
 	${CC} -c -x assembler-with-cpp -DLOCORE ${CFLAGS} \
-	    ${.IMPSRC} -o ${.TARGET}
+	    ${SRCTOP}/sys/${MACHINE_CPUARCH}/linux${SFX}/linux${SFX}_support.s \
+	    -o ${.TARGET}
 .endif
 
 linux${SFX}_genassym.o: offset.inc
Index: sys/modules/linux64/Makefile
===================================================================
--- sys/modules/linux64/Makefile
+++ sys/modules/linux64/Makefile
@@ -74,9 +74,9 @@
 	    linux_vdso.so.o ${.TARGET}
 	${STRIPBIN} -N _binary_linux_vdso_so_o_size ${.TARGET}
 
-linux_support.o: assym.inc linux_assym.h
+linux_support.o: linux_support.s assym.inc linux_assym.h
 	${CC} -c -x assembler-with-cpp -DLOCORE ${CFLAGS} \
-	    ${.IMPSRC} -o ${.TARGET}
+	    ${SRCTOP}/sys/${MACHINE}/linux/linux_support.s -o ${.TARGET}
 
 linux_genassym.o: offset.inc
 	${CC} -c ${CFLAGS:N-flto:N-fno-common} -fcommon ${.IMPSRC}