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authorLinus Torvalds <torvalds@linux-foundation.org>2018-05-20 11:25:54 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-05-20 11:25:54 -0700
commitb9aad92236391f681083fa4045083d5b846b59e0 (patch)
tree12c19ea09f2a2a4f592baf2892d88a077b681043 /kernel
parent441cab960d991897ec0e739dffee018bb2479c45 (diff)
parent5596fe34495cf0f645f417eb928ef224df3e3cb4 (diff)
Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull UP timer fix from Thomas Gleixner: "Work around the for_each_cpu() oddity on UP kernels in the tick broadcast code which causes boot failures because the CPU0 bit is always reported as set independent of the cpumask content" * 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: tick/broadcast: Use for_each_cpu() specially on UP kernels
Diffstat (limited to 'kernel')
-rw-r--r--kernel/time/tick-broadcast.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index b398c2ea69b2..aa2094d5dd27 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -612,6 +612,14 @@ static void tick_handle_oneshot_broadcast(struct clock_event_device *dev)
now = ktime_get();
/* Find all expired events */
for_each_cpu(cpu, tick_broadcast_oneshot_mask) {
+ /*
+ * Required for !SMP because for_each_cpu() reports
+ * unconditionally CPU0 as set on UP kernels.
+ */
+ if (!IS_ENABLED(CONFIG_SMP) &&
+ cpumask_empty(tick_broadcast_oneshot_mask))
+ break;
+
td = &per_cpu(tick_cpu_device, cpu);
if (td->evtdev->next_event <= now) {
cpumask_set_cpu(cpu, tmpmask);