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

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Date:   Wed, 3 Jun 2020 16:44:17 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Ira Weiny <ira.weiny@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...nel.org>
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 6/3/20 2:14 PM, Ira Weiny wrote:
> 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?
> 

For my part, all I can say is that -next is in pretty bad shape right now.
The summary of my tests says:

Build results:
	total: 151 pass: 130 fail: 21
Qemu test results:
	total: 430 pass: 375 fail: 55

sparc32 smp images in next-20200603 still crash for me with a spinlock
recursion. s390 images hang early in boot. Several others (alpha, arm64,
various ppc) don't even compile. I can run some more bisects over time,
but this is becoming a full-time job :-(.

Guenter