Messages in this thread Patch in this message | | | Date | Fri, 8 Aug 2014 17:10:12 -0700 | From | Josh Triplett <> | Subject | [PATCH v3 2/2] 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" option, 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> ---
Any architecture with architecture-specific tinification options just needs to create arch/${arch}/configs/tiny.config, and "make tinyconfig" will automatically pick up those options in addition to the architecture-independent ones in kernel/configs/tiny.config.
arch/x86/configs/tiny.config | 1 + kernel/configs/tiny.config | 4 ++++ scripts/kconfig/Makefile | 5 +++++ 3 files changed, 10 insertions(+) create mode 100644 arch/x86/configs/tiny.config create mode 100644 kernel/configs/tiny.config
diff --git a/arch/x86/configs/tiny.config b/arch/x86/configs/tiny.config new file mode 100644 index 0000000..4e2ecfa --- /dev/null +++ b/arch/x86/configs/tiny.config @@ -0,0 +1 @@ +CONFIG_NOHIGHMEM=y diff --git a/kernel/configs/tiny.config b/kernel/configs/tiny.config new file mode 100644 index 0000000..c2de56a --- /dev/null +++ b/kernel/configs/tiny.config @@ -0,0 +1,4 @@ +CONFIG_CC_OPTIMIZE_FOR_SIZE=y +CONFIG_KERNEL_XZ=y +CONFIG_OPTIMIZE_INLINING=y +CONFIG_SLOB=y diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile index 8083b94..ebf40f6 100644 --- a/scripts/kconfig/Makefile +++ b/scripts/kconfig/Makefile @@ -117,6 +117,10 @@ PHONY += kvmconfig kvmconfig: $(call mergeconfig,kvm_guest) +PHONY += tinyconfig +tinyconfig: allnoconfig + $(call mergeconfig,tiny) + # Help text used by make help help: @echo ' config - Update current config utilising a line-oriented program' @@ -138,6 +142,7 @@ help: @echo ' listnewconfig - List new options' @echo ' olddefconfig - Same as silentoldconfig but sets new symbols to their default value' @echo ' kvmconfig - Enable additional options for guest kernel support' + @echo ' tinyconfig - Configure the tiniest possible kernel' # lxdialog stuff check-lxdialog := $(srctree)/$(src)/lxdialog/check-lxdialog.sh -- 2.1.0.rc1
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