linux-kernel - Re: [BUG] 2.6.26-rc1 broke X on SPARC Ultra5

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Message-ID: <18501.39659.952880.727014@alkaid.it.uu.se>
Date:	Tue, 3 Jun 2008 21:26:35 +0200
From:	Mikael Pettersson <mikpe@...uu.se>
To:	David Miller <davem@...emloft.net>
Cc:	mikpe@...uu.se, sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [BUG] 2.6.26-rc1 broke X on SPARC Ultra5

David Miller writes:
 > From: Mikael Pettersson <mikpe@...uu.se>
 > Date: Tue, 3 Jun 2008 09:35:52 +0200
 > 
 > > Fatal server error:
 > > xf86MapPciMem: Could not mmap PCI memory [base=0xe2000000,hostbase=0xe2000000,size=2000] (No such file or directory)
 > > 
 > > I'll start digging through 2.6.25->2.6.26-rc1 later today,
 > > meanwhile I've put Xorg.0.log, Xorg strace, dmesg, and .config
 > > files for 2.6.25 (working) and 2.6.26-rc4 (failing) in
 > > <http://user.it.uu.se/~mikpe/linux/sparc64-2.6.26-rcN-xorg-bug/>.
 > 
 > It's likely this change below.  Unfortunately older versions of X
 > seemingly cannot cope with a lack of PCI host controller in the PCI
 > hierarchy exported by the kernel.
 > 
 > That's really a bug in X, current libpciaccess based X servers work
 > fine, and the bug fixed by this changeset is not solvable in any other
 > reasonable way.  So unfortunately older X verions will stay not
 > working.  Sorry.
 > 
 > commit c26d3c0138970778fabe114df99dffb34a04b1d7
 > Author: David S. Miller <davem@...emloft.net>
 > Date:   Thu May 1 01:12:40 2008 -0700

Confirmed. Reverting this patch from 2.6.26-rc1 made my Xorg-7.1.1 work again.

It's a shame though that a bug fix needs to have such draconian consequences.

/Mikael
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