dd8a410eaf
The variable 'KERNEL_ARCH' is actually a normalized version of
'ARCH'/'BR2_ARCH'. For example, 'arcle' and 'arceb' both become 'arc', just
as all powerpc variants become 'powerpc'.
It is presumably called 'KERNEL_ARCH' because the Linux kernel is typically
the first place where support for a new architecture is added, and thus is
the entity that defines the normalized name.
However, the term 'KERNEL_ARCH' can also be interpreted as 'the architecture
used by the kernel', which need not be exactly the same as 'the normalized
name for a certain arch'. In particular, for cases where a 64-bit
architecture is running a 64-bit kernel but 32-bit userspace. Examples
include:
* aarch64 architecture, with aarch64 kernel and 32-bit (ARM) userspace
* x86_64 architecture, with x86_64 kernel and 32-bit (i386) userspace
In such cases, the 'architecture used by the kernel' needs to refer to the
64-bit name (aarch64, x86_64), whereas all userspace applications need to
refer the, potentially normalized, 32-bit name.
This means that there need to be two different variables:
KERNEL_ARCH: the architecture used by the kernel
NORMALIZED_ARCH: the normalized name for the current userspace architecture
At this moment, both will actually have the same content. But a subsequent
patch will add basic support for situations described above, in which
KERNEL_ARCH may become overwritten to the 64-bit architecture, while
NORMALIZED_ARCH needs to remain the same (32-bit) case.
This commit replaces use of KERNEL_ARCH where actually the userspace arch is
needed. Places that use KERNEL_ARCH in combination with building of kernel
modules are not touched.
There may be cases where a package builds both a kernel module as userspace,
in which case it may need to know about both KERNEL_ARCH and
NORMALIZED_ARCH, for the case where they differ. But this is to be fixed on
a per-need basis.
Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Reviewed-by: Romain Naour <romain.naour@gmail.com>
[Arnout: Also rename BR2_KERNEL_ARCH to BR2_NORMALIZED_ARCH]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
47 lines
1.4 KiB
Makefile
47 lines
1.4 KiB
Makefile
################################################################################
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#
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# selftests
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#
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################################################################################
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LINUX_TOOLS += selftests
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ifeq ($(NORMALIZED_ARCH),x86_64)
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SELFTESTS_ARCH=x86
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else
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ifeq ($(NORMALIZED_ARCH),i386)
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SELFTESTS_ARCH=x86
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else
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SELFTESTS_ARCH=$(NORMALIZED_ARCH)
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endif
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endif
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SELFTESTS_DEPENDENCIES = libcap-ng popt
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SELFTESTS_MAKE_FLAGS = \
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$(LINUX_MAKE_FLAGS) \
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ARCH=$(SELFTESTS_ARCH)
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# O must be redefined here to overwrite the one used by Buildroot for
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# out of tree build. We build the selftests in $(LINUX_DIR)/tools/selftests and
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# not just $(LINUX_DIR) so that it isn't built in the root directory of the kernel
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# sources.
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#
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# The headers_install step here is important as some kernel selftests use a
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# hardcoded CFLAGS to find kernel headers e.g:
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# CFLAGS += -I../../../../usr/include/
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# The headers_install target will install the kernel headers locally inside
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# the Linux build dir
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define SELFTESTS_BUILD_CMDS
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$(TARGET_MAKE_ENV) $(MAKE1) -C $(LINUX_DIR) $(SELFTESTS_MAKE_FLAGS) \
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headers_install
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$(TARGET_MAKE_ENV) $(MAKE1) -C $(LINUX_DIR)/tools/testing/selftests \
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$(SELFTESTS_MAKE_FLAGS) O=$(LINUX_DIR)/tools/testing/selftests
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endef
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define SELFTESTS_INSTALL_TARGET_CMDS
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$(TARGET_MAKE_ENV) $(MAKE1) -C $(LINUX_DIR)/tools/testing/selftests \
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$(SELFTESTS_MAKE_FLAGS) O=$(LINUX_DIR)/tools/testing/selftests \
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INSTALL_PATH=$(TARGET_DIR)/usr/lib/kselftests install
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endef
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