From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <michael@ellerman.id.au>
Subject: Re: [PATCH 0/4] powerpc: Fix minor build issues on 2.6.32-rc7
	without CONFIG_XICS set
From: Michael Ellerman <michael@ellerman.id.au>
To: Mel Gorman <mel@csn.ul.ie>
In-Reply-To: <1258459659-11770-1-git-send-email-mel@csn.ul.ie>
References: <1258459659-11770-1-git-send-email-mel@csn.ul.ie>
Content-Type: multipart/signed; micalg="pgp-sha1";
	protocol="application/pgp-signature";
	boundary="=-OEVcSAbbn2FoXtixa0x4"
Date: Tue, 17 Nov 2009 23:39:04 +1100
Message-ID: <1258461544.24093.72.camel@concordia>
Mime-Version: 1.0
Cc: Michael Neuling <mikey@neuling.org>, Paul Mackerras <paulus@samba.org>,
	linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org
Reply-To: michael@ellerman.id.au
List-Id: Linux on PowerPC Developers Mail List <linuxppc-dev.lists.ozlabs.org>
List-Unsubscribe: <https://lists.ozlabs.org/options/linuxppc-dev>,
	<mailto:linuxppc-dev-request@lists.ozlabs.org?subject=unsubscribe>
List-Archive: <http://lists.ozlabs.org/pipermail/linuxppc-dev>
List-Post: <mailto:linuxppc-dev@lists.ozlabs.org>
List-Help: <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=help>
List-Subscribe: <https://lists.ozlabs.org/listinfo/linuxppc-dev>,
	<mailto:linuxppc-dev-request@lists.ozlabs.org?subject=subscribe>


--=-OEVcSAbbn2FoXtixa0x4
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

On Tue, 2009-11-17 at 12:07 +0000, Mel Gorman wrote:
> KConfig doesn't require CONFIG_XICS to be set with CONFIG_PSERIES but if
> it's not set, there are numerous small build errors. This is a small seri=
es
> of patches to allow CONFIG_XICS to be unset in the config.
>=20
> XICS appears to be some sort of interrupt controller but I'm not sure how
> common it is on systems that require CONFIG_PSERIES. If CONFIG_PSERIES
> universally requires CONFIG_XICS, the better path might be to force it to
> be set.

It is indeed 'some sort of interrupt controller' :)

All the virtualised PSERIES systems have, or appear to have, a XICS. So
it's pretty common.

I think the only time you see an MPIC is on older machines, and even
then maybe only if you're running bare metal.

So it is pretty much required for a PSERIES kernel, but perhaps there
are cases where the BML guys want to be able to turn it off.

cheers

--=-OEVcSAbbn2FoXtixa0x4
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: This is a digitally signed message part

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (GNU/Linux)

iEYEABECAAYFAksCmWcACgkQdSjSd0sB4dL5rgCgwA5jUM1FBy7giU/Sw8xA+98u
cYMAoIafskHb7D6znFUH0yQ3eg7JYMGh
=YXeu
-----END PGP SIGNATURE-----

--=-OEVcSAbbn2FoXtixa0x4--