> > kernel/built-in.o: In function `spawn_ksoftirqd': > > softirq.c:(.init.text+0x540): undefined reference to `smpboot_register_percpu_thread' > > Hello, Fengguang, > > Does the following patch help? Yeah, it helps! Thanks, Fengguang > ------------------------------------------------------------------------ > > > 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. > > Signed-off-by: Paul E. McKenney <paul.mckenney@xxxxxxxxxx> > Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> > > diff --git a/kernel/Makefile b/kernel/Makefile > index c0cc67a..e5602d3 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 > @@ -46,7 +46,6 @@ 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 e17653d..6b0d6fe 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 > @@ -67,6 +69,8 @@ void __init idle_threads_init(void) > } > #endif > > +#endif /* #ifdef CONFIG_SMP */ > + > static LIST_HEAD(hotplug_threads); > static DEFINE_MUTEX(smpboot_threads_lock); > -- To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
