From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751772AbbJDTCP (ORCPT ); Sun, 4 Oct 2015 15:02:15 -0400 Received: from mout.kundenserver.de ([212.227.126.187]:55561 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751518AbbJDTCN (ORCPT ); Sun, 4 Oct 2015 15:02:13 -0400 From: Arnd Bergmann To: "Luis R. Rodriguez" Cc: "Luis R. Rodriguez" , linux-arch@vger.kernel.org, mingo@kernel.org, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, linux-s390@vger.kernel.org, bp@suse.de, linux@roeck-us.net, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, rostedt@goodmis.org Subject: Re: [RFC] asm-generic/pci_iomap.h: make custom PCI BAR requirements explicit Date: Sun, 04 Oct 2015 21:02:04 +0200 Message-ID: <8902671.32Mbh7QhE4@wuerfel> User-Agent: KMail/4.11.5 (Linux/3.16.0-10-generic; KDE/4.11.5; x86_64; ; ) In-Reply-To: <20151002235346.GJ14464@wotan.suse.de> References: <1440807447-584-1-git-send-email-mcgrof@do-not-panic.com> <1866509.8pE0MIz57e@wuerfel> <20151002235346.GJ14464@wotan.suse.de> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" X-Provags-ID: V03:K0:QjRW9Fh9rOmLWmVsreJ+ADrC4oloSSgnL2XHyqnVVtISB06MsMs insiOu4QsebNGA1EPY7mEP+n2n/8cqzQOq6w4FXO4CV3bjWlkMz0EMZ3oB0W2hQBOk3Dt/5 m3h/ZU6gchqI9mSnS+IwxehyQG7wJ4QzKtC+vyKHUeCC33tfvXViYFGiRrLZO+t0OprQA+h LMuTbUhpLZXYiOBp69TGQ== X-UI-Out-Filterresults: notjunk:1;V01:K0:hCJU4vhLLhA=:mdlEMIZC4EdjWvUkndtxWE cyQejEZW8ik9OfkJB5b/KLmYFAjwTxRWy8NRV3xhPaPwI7O6ZG7ECRtBM6cZDnruAgkb8/P7p jRt7RU4OenMw9UOEbnWmORY7/UKKc1vGwwdZdku+3kYPTRl4/9B7bRxZzdD75Dps01iXmReKa CelvKbUBnS0hZKnj/yfb8yKOjgOp52yRsX+uruDFABpm6oaJsgRdJwGkeCIysvxyKniAmnsjD FI4cZXWR64d8kqrAHOtToEfuPVlX1Ueu5P/6GvPNZiolJu3Z0tZzBDt8iNT510EZdXa/t+/j3 sT5zlaJ4pgSEoCbDPur2R2bTTDsYC2+lLj3311er8qlvjm7lxeCjY5T/b7gz0es36ehZAWPdL Q+aADeRUBWlAr6YfGkJ1nnIpksuluWUXzZKZRRGWXm7S2ItrIs5u36zxzJ5fQ6WUNP4vVNKvw q9Oxxmkn/6hgxf4wFI/vAHVoP2Re15aBbM1AGTb3YTTM5QLWWrEyqPcr1bxHO6o1Op54O7AH+ SRwxJCP3VMNHP5d29UhY9b+48LhVtgJNUfEEi9EDpsnqdf2SVBEBXUnda+eV636+Bw89EZcgr +kPdYNd6JBv6N0exxJIeOMzS9dXMd9ksDGQksuCGMbPw0idsg5W3woIeAp2q4tMxOKRRXAKHi u/7cWcGi+RDQQhfrzugCMe16qm5BNoZ9WgBN+szeb3E008JlymsfBhslfFVuJDe6ftkKJ1Z63 Qfcp8STVbV0F81ay Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Saturday 03 October 2015 01:53:46 Luis R. Rodriguez wrote: > > > > Hmm, my gut feeling tells me that your approach won't solve the problem > > in general. s390 PCI is just weird in many ways and it will occasionally > > suffer from problems like this (as do other aspects of the s390 architecture > > that are unlike the rest of the world). > > > > Maybe Martin and Heiko can comment on this, they may have a preference > > from the s390 point of view. > > Hrm, so S390 is quirky is really odd ways that no other architecture is or > is at least for now not expected to be ? Absolutely correct. It is the only architecture I'm aware of that tries to support PCI that does not use pointer dereferences for MMIO. Arnd