linux-kernel - [PATCH 1/3] time: Add missing annotation to lock_hrtimer

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Message-Id: <31c31ca2d78d9368d38e1a5909bc0c9a7be5dc98.1579893447.git.jbi.octave@gmail.com>
Date:   Fri, 24 Jan 2020 20:12:21 +0000
From:   Jules Irenge <jbi.octave@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     boqun.feng@...il.com, Jules Irenge <jbi.octave@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] time: Add missing annotation to lock_hrtimer_base()

Sparse reports a warning at lock_hrtimer_base()

|warning: context imbalance in lock_hrtimer_base() - wrong count at exit
|warning: context imbalance in hrtimer_start_range_ns() - unexpected unlock
|warning: context imbalance in hrtimer_try_to_cancel() - unexpected unlock
|warning: context imbalance in __hrtimer_get_remaining()
|- unexpected unlock

To fix this , an __acquires(timer) annotation is added.
Given that lock_hrtimer_base() does actually call READ_ONCE(timer->base).
This not only fixes the warnings
but also improves on readability of the code.

Signed-off-by: Jules Irenge <jbi.octave@...il.com>
---
 kernel/time/hrtimer.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index 8de90ea31280..8f555b49395a 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -160,6 +160,7 @@ static inline bool is_migration_base(struct hrtimer_clock_base *base)
 static
 struct hrtimer_clock_base *lock_hrtimer_base(const struct hrtimer *timer,
 					     unsigned long *flags)
+	__acquires(timer)
 {
 	struct hrtimer_clock_base *base;
 
-- 
2.24.1