kbuild: clean up asm-offsets.h creation

- Move mkdir out of cmd_offsets
- Add input file to sed command instead of using cat

Signed-off-by: Brian Gerst <[e-mail]>
Signed-off-by: Sam Ravnborg <[e-mail]>

Kbuild

···
 
 quiet_cmd_offsets = GEN     $@
 define cmd_offsets
-	mkdir -p $(dir $@); \
-	cat $< | \
 	(set -e; \
 	 echo "#ifndef __ASM_OFFSETS_H__"; \
 	 echo "#define __ASM_OFFSETS_H__"; \
···
 	 echo " *"; \
 	 echo " */"; \
 	 echo ""; \
-	 sed -ne $(sed-y); \
+	 sed -ne $(sed-y) $<; \
 	 echo ""; \
 	 echo "#endif" ) > $@
 endef
···
 	$(call if_changed_dep,cc_s_c)
 
 $(obj)/$(offsets-file): arch/$(ARCH)/kernel/asm-offsets.s Kbuild
+	$(Q)mkdir -p $(dir $@)
 	$(call cmd,offsets)