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-rw-r--r--kernel/smp.c18
1 files changed, 15 insertions, 3 deletions
diff --git a/kernel/smp.c b/kernel/smp.c
index 06d574e42c72..306f8180b0d5 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -185,14 +185,26 @@ void generic_smp_call_function_single_interrupt(void)
{
struct llist_node *entry;
struct call_single_data *csd, *csd_next;
+ static bool warned;
+
+ entry = llist_del_all(&__get_cpu_var(call_single_queue));
+ entry = llist_reverse_order(entry);
/*
* Shouldn't receive this interrupt on a cpu that is not yet online.
*/
- WARN_ON_ONCE(!cpu_online(smp_processor_id()));
+ if (unlikely(!cpu_online(smp_processor_id()) && !warned)) {
+ warned = true;
+ WARN(1, "IPI on offline CPU %d\n", smp_processor_id());
- entry = llist_del_all(&__get_cpu_var(call_single_queue));
- entry = llist_reverse_order(entry);
+ /*
+ * We don't have to use the _safe() variant here
+ * because we are not invoking the IPI handlers yet.
+ */
+ llist_for_each_entry(csd, entry, llist)
+ pr_warn("IPI callback %pS sent to offline CPU\n",
+ csd->func);
+ }
llist_for_each_entry_safe(csd, csd_next, entry, llist) {
csd->func(csd->info);