linux-kernel - Re: [PATCH v5 2/2] Drivers: hv: Introduce mshv

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Message-ID: <68120ea5-d3ba-4077-a605-50a0b5188761@web.de>
Date: Sat, 19 Jul 2025 20:30:14 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: Naman Jain <namjain@...ux.microsoft.com>,
 Roman Kisel <romank@...ux.microsoft.com>,
 Saurabh Sengar <ssengar@...ux.microsoft.com>, linux-hyperv@...r.kernel.org,
 Dexuan Cui <decui@...rosoft.com>, Haiyang Zhang <haiyangz@...rosoft.com>,
 "K. Y. Srinivasan" <kys@...rosoft.com>, Wei Liu <wei.liu@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
 Alok Tiwari <alok.a.tiwari@...cle.com>,
 Anirudh Rayabharam <anrayabh@...ux.microsoft.com>,
 Nuno Das Neves <nunodasneves@...ux.microsoft.com>,
 Stanislav Kinsburskii <skinsburskii@...ux.microsoft.com>
Subject: Re: [PATCH v5 2/2] Drivers: hv: Introduce mshv_vtl driver

…
> +++ b/drivers/hv/mshv_vtl_main.c
> @@ -0,0 +1,1783 @@
…
> +static int mshv_vtl_sint_ioctl_set_eventfd(struct mshv_vtl_set_eventfd __user *arg)
> +{
…
> +	mutex_lock(&flag_lock);
> +	old_eventfd = flag_eventfds[set_eventfd.flag];
> +	WRITE_ONCE(flag_eventfds[set_eventfd.flag], eventfd);
> +	mutex_unlock(&flag_lock);
…

Under which circumstances would you become interested to apply a statement
like “guard(mutex)(&flag_lock);”?
https://elixir.bootlin.com/linux/v6.16-rc6/source/include/linux/mutex.h#L225

Regards,
Markus