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-rw-r--r--kernel/bpf/stackmap.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c
index b59ace0f0f09..b675a3f3d141 100644
--- a/kernel/bpf/stackmap.c
+++ b/kernel/bpf/stackmap.c
@@ -285,11 +285,10 @@ static void stack_map_get_build_id_offset(struct bpf_stack_build_id *id_offs,
{
int i;
struct vm_area_struct *vma;
- bool in_nmi_ctx = in_nmi();
bool irq_work_busy = false;
- struct stack_map_irq_work *work;
+ struct stack_map_irq_work *work = NULL;
- if (in_nmi_ctx) {
+ if (in_nmi()) {
work = this_cpu_ptr(&up_read_work);
if (work->irq_work.flags & IRQ_WORK_BUSY)
/* cannot queue more up_read, fallback */
@@ -328,7 +327,7 @@ static void stack_map_get_build_id_offset(struct bpf_stack_build_id *id_offs,
id_offs[i].status = BPF_STACK_BUILD_ID_VALID;
}
- if (!in_nmi_ctx) {
+ if (!work) {
up_read(&current->mm->mmap_sem);
} else {
work->sem = &current->mm->mmap_sem;