linux-kernel - Re: [PATCH v12] firmware: google: Implement cbmem in sysfs driver

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Message-ID: <Yz52r89A9JYEICCi@kroah.com>
Date:   Thu, 6 Oct 2022 08:33:19 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Julius Werner <jwerner@...omium.org>
Cc:     Jack Rosenthal <jrosenth@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        chrome-platform@...ts.linux.dev,
        Stephen Boyd <swboyd@...omium.org>,
        Tzung-Bi Shih <tzungbi@...nel.org>,
        Guenter Roeck <groeck@...omium.org>
Subject: Re: [PATCH v12] firmware: google: Implement cbmem in sysfs driver

On Wed, Oct 05, 2022 at 04:26:55PM -0700, Julius Werner wrote:
> > If the kernel is reporting a value, that value needs to be documented
> > somewhere.  If the kernel is acting on that value, it needs to know what
> > those values are.
> >
> > In this specific instance it seems that the kernel knows a subset of the
> > values, and some random userspace tool knows all of them?  Think about
> > what you would want to see here if you knew nothing about this at all.
> 
> The kernel doesn't know any of the values. The kernel is just telling
> userspace that spaces with these IDs exist and providing an interface
> to access them, it's not supposed to know what any of them mean.

Ah, ok, that was not obvious to me, sorry.  If the kernel is just a
pass-through, no objections.

thanks,

greg k-h