linux-kernel - Re: [PATCH] arch/{mips,sparc,microblaze,powerpc}: Don't enable pagefault/preempt twice

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Message-ID: <20200603211416.GA1740285@iweiny-DESK2.sc.intel.com>
Date:   Wed, 3 Jun 2020 14:14:16 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     linux-kernel@...r.kernel.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        Dan Williams <dan.j.williams@...el.com>,
        linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, sparclinux@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, dri-devel@...ts.freedesktop.org,
        Christian Koenig <christian.koenig@....com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH] arch/{mips,sparc,microblaze,powerpc}: Don't enable
 pagefault/preempt twice

On Wed, Jun 03, 2020 at 01:57:36PM -0700, Andrew Morton wrote:
> On Thu, 21 May 2020 10:42:50 -0700 Ira Weiny <ira.weiny@...el.com> wrote:
> 
> > > > 
> > > > Actually it occurs to me that the patch consolidating kmap_prot is odd for
> > > > sparc 32 bit...
> > > > 
> > > > Its a long shot but could you try reverting this patch?
> > > > 
> > > > 4ea7d2419e3f kmap: consolidate kmap_prot definitions
> > > > 
> > > 
> > > That is not easy to revert, unfortunately, due to several follow-up patches.
> > 
> > I have gotten your sparc tests to run and they all pass...
> > 
> > 08:10:34 > ../linux-build-test/rootfs/sparc/run-qemu-sparc.sh 
> > Build reference: v5.7-rc4-17-g852b6f2edc0f
> > 
> > Building sparc32:SPARCClassic:nosmp:scsi:hd ... running ......... passed
> > Building sparc32:SPARCbook:nosmp:scsi:cd ... running ......... passed
> > Building sparc32:LX:nosmp:noapc:scsi:hd ... running ......... passed
> > Building sparc32:SS-4:nosmp:initrd ... running ......... passed
> > Building sparc32:SS-5:nosmp:scsi:hd ... running ......... passed
> > Building sparc32:SS-10:nosmp:scsi:cd ... running ......... passed
> > Building sparc32:SS-20:nosmp:scsi:hd ... running ......... passed
> > Building sparc32:SS-600MP:nosmp:scsi:hd ... running ......... passed
> > Building sparc32:Voyager:nosmp:noapc:scsi:hd ... running ......... passed
> > Building sparc32:SS-4:smp:scsi:hd ... running ......... passed
> > Building sparc32:SS-5:smp:scsi:cd ... running ......... passed
> > Building sparc32:SS-10:smp:scsi:hd ... running ......... passed
> > Building sparc32:SS-20:smp:scsi:hd ... running ......... passed
> > Building sparc32:SS-600MP:smp:scsi:hd ... running ......... passed
> > Building sparc32:Voyager:smp:noapc:scsi:hd ... running ......... passed
> > 
> > Is there another test I need to run?
> 
> This all petered out, but as I understand it, this patchset still might
> have issues on various architectures.
> 
> Can folks please provide an update on the testing status?

I believe the tests were failing for Guenter due to another patch set...[1]

My tests with just this series are working.

>From my understanding the other failures were unrelated.[2]

	<quote Mike Rapoport>
	I've checked the patch above on top of the mmots which already has
	Ira's patches and it booted fine. I've used sparc32_defconfig to build
	the kernel and qemu-system-sparc with default machine and CPU.
	</quote>

Mike, am I wrong?  Do you think the kmap() patches are still causing issues?

Ira

[1] https://lore.kernel.org/lkml/2807E5FD2F6FDA4886F6618EAC48510E92EAB1DE@CRSMSX101.amr.corp.intel.com/
[2] https://lore.kernel.org/lkml/20200520195110.GH1118872@kernel.org/