linux-kernel - [PATCH v10 rebased on v6.4 15/25] locking/lockdep, cpu/hotplus: Use a weaker annotation in AP thread

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Message-Id: <20230703094752.79269-16-byungchul@sk.com>
Date:   Mon,  3 Jul 2023 18:47:42 +0900
From:   Byungchul Park <byungchul@...com>
To:     linux-kernel@...r.kernel.org
Cc:     kernel_team@...ynix.com, torvalds@...ux-foundation.org,
        damien.lemoal@...nsource.wdc.com, linux-ide@...r.kernel.org,
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Subject: [PATCH v10 rebased on v6.4 15/25] locking/lockdep, cpu/hotplus: Use a weaker annotation in AP thread

cb92173d1f0 ("locking/lockdep, cpu/hotplug: Annotate AP thread") was
introduced to make lockdep_assert_cpus_held() work in AP thread.

However, the annotation is too strong for that purpose. We don't have to
use more than try lock annotation for that.

Furthermore, now that Dept was introduced, false positive alarms was
reported by that. Replaced it with try lock annotation.

Signed-off-by: Byungchul Park <byungchul@...com>
---
 kernel/cpu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/cpu.c b/kernel/cpu.c
index f4a2c5845bcb..19076f798b34 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -356,7 +356,7 @@ int lockdep_is_cpus_held(void)
 
 static void lockdep_acquire_cpus_lock(void)
 {
-	rwsem_acquire(&cpu_hotplug_lock.dep_map, 0, 0, _THIS_IP_);
+	rwsem_acquire(&cpu_hotplug_lock.dep_map, 0, 1, _THIS_IP_);
 }
 
 static void lockdep_release_cpus_lock(void)
-- 
2.17.1