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authorGravatar Cyril Bur <cyrilbur@gmail.com>2016-03-16 14:26:33 +1100
committerGravatar Thomas Petazzoni <thomas.petazzoni@free-electrons.com>2016-03-20 22:04:47 +0100
commit8143721c3eeb20bdee76d41d0b0cfc08dfb57717 (patch)
tree61288ad0af0d757ae4d01e6280f0ecc83c5355c1 /linux
parentb7fc60abc2cbc4ccad2b85d8b11999947a81d1df (diff)
downloadbuildroot-8143721c3eeb20bdee76d41d0b0cfc08dfb57717.tar.gz
buildroot-8143721c3eeb20bdee76d41d0b0cfc08dfb57717.tar.bz2
linux: build and install kernel selftests
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>
Diffstat (limited to 'linux')
-rw-r--r--linux/Config.tools.in22
-rw-r--r--linux/linux-tool-selftests.mk46
2 files changed, 68 insertions, 0 deletions
diff --git a/linux/Config.tools.in b/linux/Config.tools.in
index 24ef8cd743..09bcfabf15 100644
--- a/linux/Config.tools.in
+++ b/linux/Config.tools.in
@@ -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
diff --git a/linux/linux-tool-selftests.mk b/linux/linux-tool-selftests.mk
new file mode 100644
index 0000000000..3cbfed2d81
--- /dev/null
+++ b/linux/linux-tool-selftests.mk
@@ -0,0 +1,46 @@
+################################################################################
+#
+# selftests
+#
+################################################################################
+
+LINUX_TOOLS += selftests
+
+ifeq ($(KERNEL_ARCH),x86_64)
+SELFTESTS_ARCH=x86
+else
+ifeq ($(KERNEL_ARCH),i386)
+SELFTESTS_ARCH=x86
+else
+SELFTESTS_ARCH=$(KERNEL_ARCH)
+endif
+endif
+
+SELFTESTS_DEPENDENCIES = libcap-ng popt
+
+SELFTESTS_MAKE_FLAGS = \
+ $(LINUX_MAKE_FLAGS) \
+ ARCH=$(SELFTESTS_ARCH)
+
+# O must be redefined here to overwrite the one used by Buildroot for
+# out of tree build. We build the selftests in $(@D)/tools/selftests and
+# not just $(@D) so that it isn't built in the root directory of the kernel
+# sources.
+#
+# The headers_install step here is important as some kernel selftests use a
+# hardcoded CFLAGS to find kernel headers e.g:
+# CFLAGS += -I../../../../usr/include/
+# The headers_install target will install the kernel headers locally inside
+# the Linux build dir
+define SELFTESTS_BUILD_CMDS
+ $(TARGET_MAKE_ENV) $(MAKE1) -C $(@D) $(SELFTESTS_MAKE_FLAGS) \
+ headers_install
+ $(TARGET_MAKE_ENV) $(MAKE1) -C $(@D)/tools/testing/selftests \
+ $(SELFTESTS_MAKE_FLAGS) O=$(@D)/tools/testing/selftests
+endef
+
+define SELFTESTS_INSTALL_TARGET_CMDS
+ $(TARGET_MAKE_ENV) $(MAKE1) -C $(@D)/tools/testing/selftests \
+ $(SELFTESTS_MAKE_FLAGS) O=$(@D)/tools/testing/selftests \
+ INSTALL_PATH=$(TARGET_DIR)/usr/lib/kselftests install
+endef