[PATCH] kbuild: avoid rebuild of file2alias for each build

[Sam Ravnborg]

When introducing devicetable-offsets generation this
had the side-effect that file2alias (and thus modpost)
were build for each kernel build.

devicetable-offsets were introduced in 6543becf26fff612cdadeed7250ccc8d49f67f27
("mod/file2alias: make modalias generation safe for cross compiling")

"make V=2" said this was due to target not included in targets.
So add devicetable-offsets to targets.

Signed-off-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
---
diff --git a/scripts/mod/Makefile b/scripts/mod/Makefile
index 9415b56..c8e04e9 100644
--- a/scripts/mod/Makefile
+++ b/scripts/mod/Makefile
@@ -30,10 +30,12 @@ define cmd_offsets
 endef
 
 # We use internal kbuild rules to avoid the "is up to date" message from make
+targets += devicetable-offsets.s
 scripts/mod/devicetable-offsets.s: scripts/mod/devicetable-offsets.c FORCE
 	$(Q)mkdir -p $(dir $@)
 	$(call if_changed_dep,cc_s_c)
 
+targets += $(devicetable-offsets-file)
 $(obj)/$(devicetable-offsets-file): scripts/mod/devicetable-offsets.s
 	$(call cmd,offsets)
 

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