linux-kernel - Re: [PATCH 1/5] locking/percpu-rwsem, lockdep: Make percpu-rwsem use its own lockdep

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Message-ID: <20191115203906.fbo6t7d2n6xk3saw@linux-p48b>
Date:   Fri, 15 Nov 2019 12:39:06 -0800
From:   Davidlohr Bueso <dave@...olabs.net>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     mingo@...nel.org, will@...nel.org, oleg@...hat.com,
        tglx@...utronix.de, linux-kernel@...r.kernel.org,
        bigeasy@...utronix.de, juri.lelli@...hat.com, williams@...hat.com,
        bristot@...hat.com, longman@...hat.com, jack@...e.com
Subject: Re: [PATCH 1/5] locking/percpu-rwsem, lockdep: Make percpu-rwsem use
 its own lockdep_map

On Wed, 13 Nov 2019, Peter Zijlstra wrote:
>@@ -37,7 +48,7 @@ static inline void percpu_down_read(stru
> {
> 	might_sleep();
>
>-	rwsem_acquire_read(&sem->rw_sem.dep_map, 0, 0, _RET_IP_);
>+	rwsem_acquire_read(&sem->dep_map, 0, 0, _RET_IP_);

Unrelated to this patch, but we also need a might_sleep() annotation
in percpu_down_write().

Thanks,
Davidlohr