From 6b4b576cd5dd08f882cf5649c2d3e28079bcdbe1 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Thu, 12 Jul 2012 01:55:54 -0700 Subject: [PATCH] hotplug: Fix UP bug in smpboot hotplug code Because kernel subsystems need their per-CPU kthreads on UP systems as well as on SMP systems, the smpboot hotplug kthread functions must be provided in UP builds as well as in SMP builds. This commit therefore adds smpboot.c to UP builds and excludes irrelevant code via #ifdef. Change-Id: Idaaa4943bd35d389ad6e9e4bd807ae2c067c1931 Signed-off-by: Paul E. McKenney Signed-off-by: Paul E. McKenney Signed-off-by: Thomas Gleixner --- kernel/Makefile | 3 +-- kernel/smpboot.c | 4 ++++ 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/kernel/Makefile b/kernel/Makefile index e63bf0b90fe1..1797b262d2fa 100644 --- a/kernel/Makefile +++ b/kernel/Makefile @@ -10,7 +10,7 @@ obj-y = fork.o exec_domain.o panic.o printk.o \ kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o mutex.o \ hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \ notifier.o ksysfs.o cred.o \ - async.o range.o groups.o lglock.o + async.o range.o groups.o lglock.o smpboot.o ifdef CONFIG_FUNCTION_TRACER # Do not trace debug files and internal ftrace files @@ -43,7 +43,6 @@ obj-$(CONFIG_DEBUG_RT_MUTEXES) += rtmutex-debug.o obj-$(CONFIG_RT_MUTEX_TESTER) += rtmutex-tester.o obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o obj-$(CONFIG_SMP) += smp.o -obj-$(CONFIG_SMP) += smpboot.o ifneq ($(CONFIG_SMP),y) obj-y += up.o endif diff --git a/kernel/smpboot.c b/kernel/smpboot.c index 9d5f7b04025d..d6c5fc054242 100644 --- a/kernel/smpboot.c +++ b/kernel/smpboot.c @@ -15,6 +15,8 @@ #include "smpboot.h" +#ifdef CONFIG_SMP + #ifdef CONFIG_GENERIC_SMP_IDLE_THREAD /* * For the hotplug case we keep the task structs around and reuse @@ -72,6 +74,8 @@ void __init idle_threads_init(void) } #endif +#endif /* #ifdef CONFIG_SMP */ + static LIST_HEAD(hotplug_threads); static DEFINE_MUTEX(smpboot_threads_lock);