Messages in this thread Patch in this message | | | Date | Wed, 6 Aug 2014 10:14:25 -0700 | From | Josh Triplett <> | Subject | [PATCH] x86: Add "make tinyconfig" to configure the tiniest possible kernel |
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Since commit 5d2acfc7b974bbd3858b4dd3f2cdc6362dd8843a ("kconfig: make allnoconfig disable options behind EMBEDDED and EXPERT") in 3.15-rc1, "make allnoconfig" disables every possible config option.
However, a few configuration options (CC_OPTIMIZE_FOR_SIZE, OPTIMIZE_INLINING) produce a smaller kernel when turned on, and a few choices exist (compression, highmem, allocator) for which a non-default option produces a smaller kernel.
Add a "tinyconfig" target, which starts from allnoconfig and then sets these options to configure the tiniest possible kernel. This provides a better baseline for embedded systems or efforts to reduce kernel size.
Signed-off-by: Josh Triplett <josh@joshtriplett.org> --- arch/x86/Makefile | 6 ++++++ arch/x86/configs/tiny.config | 5 +++++ 2 files changed, 11 insertions(+) create mode 100644 arch/x86/configs/tiny.config
diff --git a/arch/x86/Makefile b/arch/x86/Makefile index c65fd96..f20abcd 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -253,6 +253,11 @@ kvmconfig: $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m -O $(objtree) $(objtree)/.config $(srctree)/arch/x86/configs/kvm_guest.config $(Q)yes "" | $(MAKE) -f $(srctree)/Makefile oldconfig +PHONY += tinyconfig +tinyconfig: allnoconfig + $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m -O $(objtree) $(objtree)/.config $(srctree)/arch/x86/configs/tiny.config + $(Q)yes "" | $(MAKE) -f $(srctree)/Makefile oldconfig + define archhelp echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)' echo ' install - Install kernel using' @@ -267,4 +272,5 @@ define archhelp echo ' FDARGS="..." arguments for the booted kernel' echo ' FDINITRD=file initrd for the booted kernel' echo ' kvmconfig - Enable additional options for guest kernel support' + echo ' tinyconfig - Configure the tiniest possible kernel' endef diff --git a/arch/x86/configs/tiny.config b/arch/x86/configs/tiny.config new file mode 100644 index 0000000..8f0e54c --- /dev/null +++ b/arch/x86/configs/tiny.config @@ -0,0 +1,5 @@ +CONFIG_CC_OPTIMIZE_FOR_SIZE=y +CONFIG_KERNEL_XZ=y +CONFIG_NOHIGHMEM=y +CONFIG_OPTIMIZE_INLINING=y +CONFIG_SLOB=y -- 2.0.1
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