From: Jules Irenge <jbi.octave@gmail.com>
Date: Wed, 11 Mar 2020 01:09:01 +0000
Subject: bpf: Add missing annotations for __bpf_prog_enter() and
 __bpf_prog_exit()
Patch-mainline: v5.7-rc1
Git-commit: dcce11d545cc5d04c3fb529a8e2a0da987389139
References: bsc#1177028

Sparse reports a warning at __bpf_prog_enter() and __bpf_prog_exit()

warning: context imbalance in __bpf_prog_enter() - wrong count at exit
warning: context imbalance in __bpf_prog_exit() - unexpected unlock

The root cause is the missing annotation at __bpf_prog_enter()
and __bpf_prog_exit()

Add the missing __acquires(RCU) annotation
Add the missing __releases(RCU) annotation

Signed-off-by: Jules Irenge <jbi.octave@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200311010908.42366-2-jbi.octave@gmail.com
Acked-by: Gary Lin <glin@suse.com>
---
 kernel/bpf/trampoline.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/kernel/bpf/trampoline.c
+++ b/kernel/bpf/trampoline.c
@@ -352,6 +352,7 @@ out:
  * call __bpf_prog_exit
  */
 u64 notrace __bpf_prog_enter(void)
+	__acquires(RCU)
 {
 	u64 start = 0;
 
@@ -363,6 +364,7 @@ u64 notrace __bpf_prog_enter(void)
 }
 
 void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start)
+	__releases(RCU)
 {
 	struct bpf_prog_stats *stats;