kbuild: fix silentoldconfig with make O=
Al Viro reported that sometimes silentoldconfig failed because output directory was missing. So create it unconditionally before executing conf Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
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@ -491,6 +491,7 @@ include .config
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# If .config is newer than include/linux/autoconf.h, someone tinkered
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# with it and forgot to run make oldconfig
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include/linux/autoconf.h: .config
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$(Q)mkdir -p include/linux
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$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
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else
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# Dummy target needed, because used as prerequisite
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