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Commit 0da1d4a0 authored by Josh Triplett's avatar Josh Triplett
Browse files

x86: Add "make tinyconfig" to configure the tiniest possible kernel 



Since commit 5d2acfc7 ("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: default avatarJosh Triplett <josh@joshtriplett.org>
parent 3aaefce1

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