From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout.gmx.net (mout.gmx.net [212.227.17.20]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3zmgJP4qFxzDrKT for ; Thu, 22 Feb 2018 01:45:24 +1100 (AEDT) Date: Wed, 21 Feb 2018 15:44:10 +0100 From: Jonathan =?utf-8?Q?Neusch=C3=A4fer?= To: Jonathan =?utf-8?Q?Neusch=C3=A4fer?= Cc: christophe leroy , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Michael Ellerman , linux-mm@kvack.org, Joel Stanley , Benjamin Herrenschmidt , Paul Mackerras , Balbir Singh , Guenter Roeck Subject: Re: [PATCH 1/6] powerpc/mm/32: Use pfn_valid to check if pointer is in RAM Message-ID: <20180221144410.ckm4m366scrgk2rm@latitude> References: <20180220161424.5421-1-j.neuschaefer@gmx.net> <20180220161424.5421-2-j.neuschaefer@gmx.net> <0d14cb2c-dd00-d258-cb15-302b2a9d684f@c-s.fr> <20180221135119.d3qgvdck5yruomi7@latitude> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="fphdnp5fz5oqdxfs" In-Reply-To: <20180221135119.d3qgvdck5yruomi7@latitude> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , --fphdnp5fz5oqdxfs Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Feb 21, 2018 at 02:51:19PM +0100, Jonathan Neusch=C3=A4fer wrote: [...] > While looking through arch/powerpc/mm, I noticed that there's a > page_is_ram function, which simply uses the memblocks directly, on > PPC32. Oops, I misread the code here. memblock is used on PPC64. > It seems like a good candidate for the RAM check in > __ioremap_caller, except that there's this code, which apparently > trashes memblock 0 completely on non-CONFIG_NEED_MULTIPLE_NODES: >=20 > https://elixir.bootlin.com/linux/v4.16-rc2/source/arch/powerpc/mm/mem.c= #L223 >=20 >=20 > Thanks, > Jonathan Neusch=C3=A4fer --fphdnp5fz5oqdxfs Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJajYW6AAoJEAgwRJqO81/bFD4P/jXB4GtqWaVXyc+1KcLnz2dz y1sAXcvxMgvHA+saHWsoUzMD1T8QR+7Q5N5PKUFmeWPDLAjAJq8LyuVt/oxsey5f EnBNlLGohqO4uF934qHvrDnfyopqesJWAx/v3/ioMAc34b5LX7wRH234hV1H/dyf U85qSkTHTpH4bRxZyXwddsJFtEfKkE34oupi4YU4AX5VctNzCuW9eR4GE2BpJ6Iw ibMaw/9U3hOO6ok2Wa3h6GgcqcNH0uD9TFLnvLbjCZJzCsGjCui/TGTb5tysLsoM 4qhJsJwSo0GAAzxtrrKevrV6qEezwFUIGk/certOiAz8BGhmOYqDFoItiYpYpf0K aHrDj9MoviIaqfIdCfZCGp0t6fnt1cJb7a/wkbkORfqrsTjjZb0UTwvEgCIhrcy5 L9MEh7p2HLgwlRzW6nlZI6RdpuJK65RnVfIYN0Y+VVt4riBkMRBSiRs/wMFNI2YM I41aDYtkpSl9ve0V+h+gUS/vjqaE8MkZlNobTt1TW+qmPPmquaHvLekeC27dGtwu PlfOjWYMceMyqRd4iIcRZ2eQEUvslg9g94Yyl0FmFDMQLCJM1f6PW8FEKlA8pGSL h+BwphnRhFAABKHC+0AaKpaBOWM9OVwL+LWkeeQifRao1IpL1Ml+E26Xl7icqIFE 4uM02EJ0azFFfpUdczVu =K2aT -----END PGP SIGNATURE----- --fphdnp5fz5oqdxfs--