lkml.org 
[lkml]   [2020]   [Mar]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/8] bpf: Add missing annotations for __bpf_prog_enter() and __bpf_prog_exit()
Date
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>
---
kernel/bpf/trampoline.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/kernel/bpf/trampoline.c b/kernel/bpf/trampoline.c
index 6b264a92064b..09bce10ad1cc 100644
--- a/kernel/bpf/trampoline.c
+++ b/kernel/bpf/trampoline.c
@@ -374,6 +374,7 @@ void bpf_trampoline_put(struct bpf_trampoline *tr)
* call __bpf_prog_exit
*/
u64 notrace __bpf_prog_enter(void)
+ __acquires(RCU)
{
u64 start = 0;

@@ -385,6 +386,7 @@ u64 notrace __bpf_prog_enter(void)
}

void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start)
+ __releases(RCU)
{
struct bpf_prog_stats *stats;

--
2.24.1
\
 
 \ /
  Last update: 2020-03-11 02:11    [W:0.191 / U:0.272 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site