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linux: build and install kernel selftests

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This patch adds the ability to compile and install the kernel
selftests into the target at /usr/lib/kselftests. The rationale behind
/usr/lib is that the selftests have subdirectories where they are
installed which makes them unsuitable to be placed in /usr/sbin as
this would result in /usr/sbin/kselftests/x/y/z. While the selftests
aren't libraries either, they don't achieve much as a standalone
binary so they can be considered to be a 'library of tests' making
/usr/lib sensible.

The selftests require that the kernel headers be installed into the
kernel build tree as some of the selftests have a hardcoded CFLAGS to
include kernel headers (CFLAGS += -I../../../../usr/include/). This is
most easily achieved by using the make ... headers_install inside the
kernel build dir.

This is likely to be a rarely used debugging/performance feature for
development and unlikely to be used in a production configuration.

Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Tested-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
[Thomas:
 - remove bash as a build dependency, it is only a runtime dependency.
 - fix typo in the Config.in help text, and rewrap
 - add missing 'depends on BR2_USE_MMU' dependency for the comment.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Cyril Bur
2016-03-16 14:26:33 +11:00
committed by Thomas Petazzoni
parent b7fc60abc2
commit 8143721c3e
2 changed files with 68 additions and 0 deletions
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22
linux/Config.tools.in
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@@ -26,4 +26,26 @@ config BR2_LINUX_KERNEL_TOOL_PERF
https://perf.wiki.kernel.org/
config BR2_LINUX_KERNEL_TOOL_SELFTESTS
bool"selftests"
depends on BR2_PACKAGE_BUSYBOX_SHOW_OTHERS # bash
depends on BR2_USE_MMU # bash
select BR2_PACKAGE_BASH # runtime
select BR2_PACKAGE_POPT
select BR2_PACKAGE_LIBCAP_NG
help
Build and install (to /usr/lib/kselftests) kernel selftests.
Use of this option implies you know the process of using and
compiling the kernel selftests. The Makefile to build and
install these is very noisy and may appear to cause your
build to fail for strange reasons.
This is very much a use at your risk option and may not work
for every setup or every architecture.
comment "selftests needs BR2_PACKAGE_BUSYBOX_SHOW_OTHERS"
depends on BR2_USE_MMU
depends on !BR2_PACKAGE_BUSYBOX_SHOW_OTHERS
endmenu