Re: [PATCH v5 2/2] Drivers: hv: Introduce mshv_vtl driver

[Markus Elfring]

…
> +++ 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