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-rw-r--r--kernel/bpf/stackmap.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c
index 052580c33d26..173e983619d7 100644
--- a/kernel/bpf/stackmap.c
+++ b/kernel/bpf/stackmap.c
@@ -287,7 +287,7 @@ static void stack_map_get_build_id_offset(struct bpf_stack_build_id *id_offs,
bool irq_work_busy = false;
struct stack_map_irq_work *work = NULL;
- if (in_nmi()) {
+ if (irqs_disabled()) {
work = this_cpu_ptr(&up_read_work);
if (work->irq_work.flags & IRQ_WORK_BUSY)
/* cannot queue more up_read, fallback */
@@ -295,8 +295,9 @@ static void stack_map_get_build_id_offset(struct bpf_stack_build_id *id_offs,
}
/*
- * We cannot do up_read() in nmi context. To do build_id lookup
- * in nmi context, we need to run up_read() in irq_work. We use
+ * We cannot do up_read() when the irq is disabled, because of
+ * risk to deadlock with rq_lock. To do build_id lookup when the
+ * irqs are disabled, we need to run up_read() in irq_work. We use
* a percpu variable to do the irq_work. If the irq_work is
* already used by another lookup, we fall back to report ips.
*