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Date: Fri, 24 Nov 2023 15:56:19 +0000
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Mark Brown <broonie@kernel.org>
Cc: Oleksij Rempel <o.rempel@pengutronix.de>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	Ulf Hansson <ulf.hansson@linaro.org>, kernel@pengutronix.de,
	linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org,
	linux-pm@vger.kernel.org,
	=?iso-8859-1?Q?S=F8ren?= Andersen <san@skov.dk>
Subject: Re: [PATCH v1 0/3] introduce priority-based shutdown support
Message-ID: <2023112435-dazzler-crisped-04a6@gregkh>
References: <20231124145338.3112416-1-o.rempel@pengutronix.de>
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 <ZWC/hKav0JANhWKM@finisterre.sirena.org.uk>
 <2023112458-stature-commuting-c66f@gregkh>
 <ZWDGGqsCq9iSnHtO@finisterre.sirena.org.uk>
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In-Reply-To: <ZWDGGqsCq9iSnHtO@finisterre.sirena.org.uk>

On Fri, Nov 24, 2023 at 03:49:46PM +0000, Mark Brown wrote:
> On Fri, Nov 24, 2023 at 03:27:48PM +0000, Greg Kroah-Hartman wrote:
> > On Fri, Nov 24, 2023 at 03:21:40PM +0000, Mark Brown wrote:
> 
> > > This came out of some discussions about trying to handle emergency power
> > > failure notifications.
> 
> > I'm sorry, but I don't know what that means.  Are you saying that the
> > kernel is now going to try to provide a hard guarantee that some devices
> > are going to be shut down in X number of seconds when asked?  If so, why
> > not do this in userspace?
> 
> No, it was initially (or when I initially saw it anyway) handling of
> notifications from regulators that they're in trouble and we have some
> small amount of time to do anything we might want to do about it before
> we expire.

So we are going to guarantee a "time" in which we are going to do
something?  Again, if that's required, why not do it in userspace using
a RT kernel?

thanks,

greg k-h