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kbuild: implement CONFIG_HEADERS_INSTALL for Usermode Linux

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userprogs sometimes need access to UAPI headers.
This is currently not possible for Usermode Linux, as UM is only
a pseudo architecture built on top of a regular architecture and does
not have its own UAPI.
Instead use the UAPI headers from the underlying regular architecture.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Thomas Weißschuh 2025-02-17 11:59:21 +01:00 committed by Masahiro Yamada
parent 700bd25bd4
commit 268d191abc
2 changed files with 4 additions and 2 deletions
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5
Makefile
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@ -1361,9 +1361,12 @@ hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
PHONY += headers PHONY += headers
headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
$(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) ifdef HEADER_ARCH
$(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers
else
$(Q)$(MAKE) $(hdr-inst)=include/uapi $(Q)$(MAKE) $(hdr-inst)=include/uapi
$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
endif
ifdef CONFIG_HEADERS_INSTALL ifdef CONFIG_HEADERS_INSTALL
prepare: headers prepare: headers

1
lib/Kconfig.debug
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@ -473,7 +473,6 @@ config READABLE_ASM
config HEADERS_INSTALL config HEADERS_INSTALL
bool "Install uapi headers to usr/include" bool "Install uapi headers to usr/include"
depends on !UML
help help
This option will install uapi headers (headers exported to user-space) This option will install uapi headers (headers exported to user-space)
into the usr/include directory for use during the kernel build. into the usr/include directory for use during the kernel build.