From 8143721c3eeb20bdee76d41d0b0cfc08dfb57717 Mon Sep 17 00:00:00 2001 From: Cyril Bur Date: Wed, 16 Mar 2016 14:26:33 +1100 Subject: [PATCH] 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 Reviewed-by: "Yann E. MORIN" Tested-by: "Yann E. MORIN" [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 --- linux/Config.tools.in | 22 +++++++++++++++++ linux/linux-tool-selftests.mk | 46 +++++++++++++++++++++++++++++++++++ 2 files changed, 68 insertions(+) create mode 100644 linux/linux-tool-selftests.mk 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 -- 2.30.2