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Subject: Re: [PATCH] arch/{mips,sparc,microblaze,powerpc}: Don't enable
 pagefault/preempt twice
To:     Ira Weiny <ira.weiny@intel.com>
Cc:     linux-kernel@vger.kernel.org,
        Andrew Morton <akpm@linux-foundation.org>,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
        Helge Deller <deller@gmx.de>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        "David S. Miller" <davem@davemloft.net>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Andy Lutomirski <luto@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Chris Zankel <chris@zankel.net>,
        Max Filippov <jcmvbkbc@gmail.com>,
        Dan Williams <dan.j.williams@intel.com>,
        linux-snps-arc@lists.infradead.org,
        linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org,
        linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org,
        linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org,
        linux-xtensa@linux-xtensa.org, dri-devel@lists.freedesktop.org,
        Christian Koenig <christian.koenig@amd.com>,
        Al Viro <viro@zeniv.linux.org.uk>,
        Christoph Hellwig <hch@lst.de>
References: <20200507150004.1423069-8-ira.weiny@intel.com>
 <20200518184843.3029640-1-ira.weiny@intel.com>
 <20200519165422.GA5838@roeck-us.net>
 <20200519184031.GB3356843@iweiny-DESK2.sc.intel.com>
 <20200519194215.GA71941@roeck-us.net>
 <20200520051315.GA3660833@iweiny-DESK2.sc.intel.com>
From:   Guenter Roeck <linux@roeck-us.net>
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Message-ID: <d86dba19-4f4b-061e-a2c7-4f037e9e2de2@roeck-us.net>
Date:   Thu, 21 May 2020 09:05:41 -0700
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On 5/19/20 10:13 PM, Ira Weiny wrote:
> On Tue, May 19, 2020 at 12:42:15PM -0700, Guenter Roeck wrote:
>> On Tue, May 19, 2020 at 11:40:32AM -0700, Ira Weiny wrote:
>>> On Tue, May 19, 2020 at 09:54:22AM -0700, Guenter Roeck wrote:
>>>> On Mon, May 18, 2020 at 11:48:43AM -0700, ira.weiny@intel.com wrote:
>>>>> From: Ira Weiny <ira.weiny@intel.com>
>>>>>
>>>>> The kunmap_atomic clean up failed to remove one set of pagefault/preempt
>>>>> enables when vaddr is not in the fixmap.
>>>>>
>>>>> Fixes: bee2128a09e6 ("arch/kunmap_atomic: consolidate duplicate code")
>>>>> Signed-off-by: Ira Weiny <ira.weiny@intel.com>
>>>>
>>>> microblazeel works with this patch,
>>>
>>> Awesome...  Andrew in my rush yesterday I should have put a reported by on the
>>> patch for Guenter as well.
>>>
>>> Sorry about that Guenter,
>>
>> No worries.
>>
>>> Ira
>>>
>>>> as do the nosmp sparc32 boot tests,
>>>> but sparc32 boot tests with SMP enabled still fail with lots of messages
>>>> such as:
>>>>
>>>> BUG: Bad page state in process swapper/0  pfn:006a1
>>>> page:f0933420 refcount:0 mapcount:1 mapping:(ptrval) index:0x1
>>>> flags: 0x0()
>>>> raw: 00000000 00000100 00000122 00000000 00000001 00000000 00000000 00000000
>>>> page dumped because: nonzero mapcount
>>>> Modules linked in:
>>>> CPU: 0 PID: 1 Comm: swapper/0 Tainted: G    B             5.7.0-rc6-next-20200518-00002-gb178d2d56f29 #1
>>>> [f00e7ab8 :
>>>> bad_page+0xa8/0x108 ]
>>>> [f00e8b54 :
>>>> free_pcppages_bulk+0x154/0x52c ]
>>>> [f00ea024 :
>>>> free_unref_page+0x54/0x6c ]
>>>> [f00ed864 :
>>>> free_reserved_area+0x58/0xec ]
>>>> [f0527104 :
>>>> kernel_init+0x14/0x110 ]
>>>> [f000b77c :
>>>> ret_from_kernel_thread+0xc/0x38 ]
>>>> [00000000 :
>>>> 0x0 ]
>>>>
>>>> Code path leading to that message is different but always the same
>>>> from free_unref_page().
> 
> 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.

Guenter

> Alternately I will need to figure out how to run the sparc on qemu here...
> 
> Thanks very much for all the testing though!  :-D
> 
> Ira
> 
>>>>
>>>> Still testing ppc images.
>>>>
>>
>> ppc image tests are passing with this patch.
>>
>> Guenter