diff mbox series

[bpf-next,v4,4/7] bpf: export bpf_link_inc_not_zero.

Message ID 20240521225121.770930-5-thinker.li@gmail.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series Notify user space when a struct_ops object is detached/unregistered | expand

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Commit Message

Kui-Feng Lee May 21, 2024, 10:51 p.m. UTC 
bpf_link_inc_not_zero() will be used by kernel modules.  We will use it in
bpf_testmod.c later.

Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
---
 include/linux/bpf.h  | 6 ++++++
 kernel/bpf/syscall.c | 3 ++-
 2 files changed, 8 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 5f7496ef8b7c..6b592094f9b4 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -2351,6 +2351,7 @@  int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
 int bpf_link_settle(struct bpf_link_primer *primer);
 void bpf_link_cleanup(struct bpf_link_primer *primer);
 void bpf_link_inc(struct bpf_link *link);
+struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link);
 void bpf_link_put(struct bpf_link *link);
 int bpf_link_new_fd(struct bpf_link *link);
 struct bpf_link *bpf_link_get_from_fd(u32 ufd);
@@ -2722,6 +2723,11 @@  static inline void bpf_link_inc(struct bpf_link *link)
 {
 }
 
+static inline struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link)
+{
+	return NULL;
+}
+
 static inline void bpf_link_put(struct bpf_link *link)
 {
 }
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index ad4f81ed27f0..31fabe26371d 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -5422,10 +5422,11 @@  static int link_detach(union bpf_attr *attr)
 	return ret;
 }
 
-static struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link)
+struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link)
 {
 	return atomic64_fetch_add_unless(&link->refcnt, 1, 0) ? link : ERR_PTR(-ENOENT);
 }
+EXPORT_SYMBOL(bpf_link_inc_not_zero);
 
 struct bpf_link *bpf_link_by_id(u32 id)
 {