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 <songmuchun@bytedance.com> --- kernel/bpf/syscall.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-)

Author: Muchun Song

kernel/bpf/syscall.c

@@ -2345,12 +2345,8 @@ 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)