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Date:   Wed, 12 Jun 2019 09:57:36 +0300
From:   Mike Rapoport <rppt@linux.ibm.com>
To:     Qian Cai <cai@lca.pw>
Cc:     Mark Rutland <mark.rutland@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        catalin.marinas@arm.com,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        mhocko@kernel.org, linux-mm@kvack.org, vdavydov.dev@gmail.com,
        hannes@cmpxchg.org, cgroups@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH -next] arm64/mm: fix a bogus GFP flag in pgd_alloc()
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Hi,

On Tue, Jun 11, 2019 at 08:46:45AM -0400, Qian Cai wrote:
> 
> > On Jun 11, 2019, at 8:41 AM, Mike Rapoport <rppt@linux.ibm.com> wrote:
> > 
> > Sorry for the delay, I'm mostly offline these days.
> > 
> > I wanted to understand first what is the reason for the failure. I've tried
> > to reproduce it with qemu, but I failed to find a bootable configuration
> > that will have PGD_SIZE != PAGE_SIZE :(
> > 
> > Qian Cai, can you share what is your environment and the kernel config?
> 
> https://raw.githubusercontent.com/cailca/linux-mm/master/arm64.config
> 
> # lscpu
> Architecture:        aarch64
> Byte Order:          Little Endian
> CPU(s):              256
> On-line CPU(s) list: 0-255
> Thread(s) per core:  4
> Core(s) per socket:  32
> Socket(s):           2
> NUMA node(s):        2
> Vendor ID:           Cavium
> Model:               1
> Model name:          ThunderX2 99xx
> Stepping:            0x1
> BogoMIPS:            400.00
> L1d cache:           32K
> L1i cache:           32K
> L2 cache:            256K
> L3 cache:            32768K
> NUMA node0 CPU(s):   0-127
> NUMA node1 CPU(s):   128-255
> Flags:               fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics cpuid asimdrdm
> 
> # dmidecode
> Handle 0x0001, DMI type 1, 27 bytes
> System Information
>         Manufacturer: HPE
>         Product Name: Apollo 70             
>         Version: X1
>         Wake-up Type: Power Switch
>         Family: CN99XX
> 

Can you please also send the entire log when the failure happens?

Another question, is the problem exist with PGD_SIZE == PAGE_SIZE?
 

-- 
Sincerely yours,
Mike.