Currently, cpuset is the only user of the union-find implementation. Compiling union-find in all configurations unnecessarily increases the code size when building the kernel without cgroup support. Modify the build system to compile union-find only when CONFIG_CPUSETS is enabled. Link: https://lore.kernel.org/lkml/1ccd6411-5002-4574-bb8e-3e64bba6a757@xxxxxxxxxx/ Suggested-by: Waiman Long <llong@xxxxxxxxxx> Signed-off-by: Kuan-Wei Chiu <visitorckw@xxxxxxxxx> Acked-by: Waiman Long <longman@xxxxxxxxxx> Acked-by: Tejun Heo <tj@xxxxxxxxxx> --- init/Kconfig | 1 + lib/Kconfig | 3 +++ lib/Makefile | 3 ++- 3 files changed, 6 insertions(+), 1 deletion(-) diff --git a/init/Kconfig b/init/Kconfig index 530a382ee0fe..323206ff5848 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1153,6 +1153,7 @@ config CGROUP_HUGETLB config CPUSETS bool "Cpuset controller" depends on SMP + select UNION_FIND help This option will let you create and manage CPUSETs which allow dynamically partitioning a system into sets of CPUs and diff --git a/lib/Kconfig b/lib/Kconfig index b38849af6f13..cf303bd91dda 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -777,3 +777,6 @@ config POLYNOMIAL config FIRMWARE_TABLE bool + +config UNION_FIND + bool diff --git a/lib/Makefile b/lib/Makefile index 773adf88af41..03b88b501b49 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -35,8 +35,9 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \ is_single_threaded.o plist.o decompress.o kobject_uevent.o \ earlycpio.o seq_buf.o siphash.o dec_and_lock.o \ nmi_backtrace.o win_minmax.o memcat_p.o \ - buildid.o objpool.o union_find.o + buildid.o objpool.o +lib-$(CONFIG_UNION_FIND) += union_find.o lib-$(CONFIG_PRINTK) += dump_stack.o lib-$(CONFIG_SMP) += cpumask.o -- 2.34.1
