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From: Tejun Heo <tj@kernel.org>
To: Sven Schnelle <svens@linux.ibm.com>
Cc: Lai Jiangshan <jiangshanlai@gmail.com>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] workqueue: fix selection of wake_cpu in kick_pool()
Date: Wed, 17 Apr 2024 15:55:57 -1000	[thread overview]
Message-ID: <ZiB9rYBu-0qjsCbF@slm.duckdns.org> (raw)
In-Reply-To: <yt9dpluogfw9.fsf@linux.ibm.com>

Hello,

On Wed, Apr 17, 2024 at 05:36:38PM +0200, Sven Schnelle wrote:
> > This generally seems like a good idea but isn't this still racy? The CPU may
> > go down between setting p->wake_cpu and wake_up_process().
> 
> Don't know without reading the source, but how does this code normally
> protect against that?

Probably by wrapping determining the wake_cpu and the wake_up inside
cpu_read_lock() section.

Thanks.

-- 
tejun

  reply	other threads:[~2024-04-18  1:55 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-04-15  5:35 Sven Schnelle
2024-04-16 23:06 ` Tejun Heo
2024-04-17 15:36   ` Sven Schnelle
2024-04-18  1:55     ` Tejun Heo [this message]
2024-04-18  5:54       ` Sven Schnelle
2024-04-18 15:56         ` Tejun Heo
2024-04-19  8:27       ` Sven Schnelle
2024-04-19 15:40         ` Tejun Heo
2024-04-22 22:44 ` Tejun Heo
2024-04-23  6:20   ` Sven Schnelle

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