kbuild: disable header exports for UML in a straightforward way

[ Upstream commit 1b620d539ccc18a1aca1613d9ff078115a7891a1 ]

Previously 'make ARCH=um headers' stopped because of missing
arch/um/include/uapi/asm/Kbuild.

The error is not shown since commit ed102bf2afed ("um: Fix W=1
missing-include-dirs warnings") added arch/um/include/uapi/asm/Kbuild.

Hard-code the unsupported architecture, so it works like before.

Fixes: ed102bf2afed ("um: Fix W=1 missing-include-dirs warnings")
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/Makefile b/Makefile
index eca45b7be9c1ea548beb3e4f3a3a1f5488d85dc5..32253ea989217b1f082083c173ad61cb00ddfcce 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -1332,8 +1332,7 @@ hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
 
 PHONY += headers
 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
-       $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
-         $(error Headers not exportable for the $(SRCARCH) architecture))
+       $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML))
        $(Q)$(MAKE) $(hdr-inst)=include/uapi
        $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi