linux-kernel - Re: [PATCH v6 3/6] locking/rwsem: Disable preemption at all down_write*() and up

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Message-ID: <20221216150341.GA19127@incl>
Date:   Fri, 16 Dec 2022 16:03:41 +0100
From:   Jiri Wiesner <jwiesner@...e.de>
To:     Waiman Long <longman@...hat.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Boqun Feng <boqun.feng@...il.com>,
        linux-kernel@...r.kernel.org, john.p.donnelly@...cle.com,
        Hillf Danton <hdanton@...a.com>,
        Mukesh Ojha <quic_mojha@...cinc.com>,
        Ting11 Wang 王婷 <wangting11@...omi.com>
Subject: Re: [PATCH v6 3/6] locking/rwsem: Disable preemption at all
 down_write*() and up_write() code paths

On Thu, Nov 17, 2022 at 09:20:13PM -0500, Waiman Long wrote:
> The previous patch has disabled preemption at all the down_read()
> and up_read() code paths. For symmetry, this patch extends commit
> 48dfb5d2560d ("locking/rwsem: Disable preemption while trying for rwsem
> lock") to have preemption disabled at all the down_write() and up_write()
> code path including downgrade_write().
> 
> Suggested-by: Peter Zijlstra <peterz@...radead.org>
> Signed-off-by: Waiman Long <longman@...hat.com>
> ---

Tested-by: Jiri Wiesner <jwiesner@...e.de>

-- 
Jiri Wiesner
SUSE Labs