The in_atomic macro cannot always detect atomic context. In particular,

it cannot know about held spinlocks in non-preemptible kernels. Although,
there is no user call bpf_link_put() with holding spinlock now. Be the
safe side, we can avoid this in the feature.

Signed-off-by: Muchun Song <[email protected]>
---
 kernel/bpf/syscall.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

Author: Muchun Song

kernel/bpf/syscall.c

@@ -2335,12 +2335,8 @@ void bpf_link_put(struct bpf_link *link)
 	if (!atomic64_dec_and_test(&link->refcnt))
 		return;
 
-	if (in_atomic()) {
-		INIT_WORK(&link->work, bpf_link_put_deferred);
-		schedule_work(&link->work);
-	} else {
-		bpf_link_free(link);
-	}
+	INIT_WORK(&link->work, bpf_link_put_deferred);
+	schedule_work(&link->work);
 }
 
 static int bpf_link_release(struct inode *inode, struct file *filp)