linux-kernel - Re: [PATCH] x86/EISA: Don't probe EISA bus for Xen PV guests

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Message-ID: <alpine.DEB.2.21.1809112218580.1427@nanos.tec.linutronix.de>
Date:   Tue, 11 Sep 2018 22:20:09 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>
cc:     mingo@...hat.com, hpa@...or.com, x86@...nel.org,
        linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        jgross@...e.com, andy@...ugglers.net
Subject: Re: [PATCH] x86/EISA: Don't probe EISA bus for Xen PV guests

On Tue, 11 Sep 2018, Boris Ostrovsky wrote:

> For unprivileged Xen PV guests this is normal memory and ioremap will
> not be able to properly map it.
> 
> While at it, since ioremap may return NULL, add a test for pointer's
> validity.

I assume this goes back to very dead kernels, so that should go with a Cc
stable, right?

Thanks,

	tglx