x86: Add "make tinyconfig" to configure the tiniest possible kernel (0da1d4a0) · Commits · 戴 / test

Since commit ("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>

arch/x86/configs/tiny.config

0 → 100644

+1 −0

Original line number	Diff line number	Diff line
		CONFIG_NOHIGHMEM=y

kernel/configs/tiny.config

0 → 100644

+4 −0

Original line number	Diff line number	Diff line
		CONFIG_CC_OPTIMIZE_FOR_SIZE=y
		CONFIG_KERNEL_XZ=y
		CONFIG_OPTIMIZE_INLINING=y
		CONFIG_SLOB=y

scripts/kconfig/Makefile

+5 −0

Original line number	Diff line number	Diff line
		@@ -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

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