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Date: Mon, 30 Jul 2018 18:59:25 +0200
From: Christoph Hellwig <hch@lst.de>
Subject: Re: [kbuild:kconfig2 1/10] arch/um/Kconfig:3: can't open file
        "arch/x86_64/um/Kconfig"
Message-ID: <20180730165925.GA29494@lst.de>
References: <201807281506.H8XSZLgK%fengguang.wu@intel.com> <CAK7LNAS6vY1SMcos_VOaqPUrLUJqgsH9jQ4aKodx5yesCPSCBQ@mail.gmail.com> <20180730094241.GA19128@lst.de>
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To: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: kbuild test robot <lkp@intel.com>, Christoph Hellwig <hch@lst.de>, kbuild-all@01.org, Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>, Randy Dunlap <rdunlap@infradead.org>

What do you think of the patch below?  This reuses the HEADER_ARCH
variable that uml already needs to setup anyway:

diff --git a/arch/um/Kconfig b/arch/um/Kconfig
index dd4b67131105..6b9938919f0b 100644
--- a/arch/um/Kconfig
+++ b/arch/um/Kconfig
@@ -63,7 +63,7 @@ config NR_CPUS
 	range 1 1
 	default 1
 
-source "arch/$(SUBARCH)/um/Kconfig"
+source "arch/$(HEADER_ARCH)/um/Kconfig"
 
 config STATIC_LINK
 	bool "Force a static link"
diff --git a/arch/um/Makefile b/arch/um/Makefile
index 0207f6316d71..a88b40ee0332 100644
--- a/arch/um/Makefile
+++ b/arch/um/Makefile
@@ -174,4 +174,4 @@ endef
 include/generated/user_constants.h: $(HOST_DIR)/um/user-offsets.s
 	$(call filechk,gen-asm-offsets)
 
-export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS DEV_NULL_PATH
+export HEADER_ARCH USER_CFLAGS CFLAGS_NO_HARDENING OS DEV_NULL_PATH