linux-kernel - Re: [PATCH] LoongArch: add p?d

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Message-ID: <a371b120-5536-1054-7f09-957b427e46ff@redhat.com>
Date:   Wed, 6 Sep 2023 10:08:28 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Hongchen Zhang <zhanghongchen@...ngson.cn>,
        Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Mike Rapoport IBM)" <rppt@...nel.org>,
        Feiyang Chen <chenfeiyang@...ngson.cn>,
        Qi Zheng <zhengqi.arch@...edance.com>,
        "Matthew Wilcox Oracle)" <willy@...radead.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:     loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org,
        loongson-kernel@...ts.loongnix.cn
Subject: Re: [PATCH] LoongArch: add p?d_leaf() definitions

On 06.09.23 10:06, Hongchen Zhang wrote:
> Hi David,
> 
> On 2023/9/6 pm 3:42, David Hildenbrand wrote:
>> On 05.09.23 08:49, Hongchen Zhang wrote:
>>> When I do LTP test, LTP test case ksm06 caused panic at
>>>      break_ksm_pmd_entry
>>>        -> pmd_leaf (Huge page table but False)
>>>        -> pte_present (panic)
>>>
>>
>> Probably there are other problematic bits without that can trigger that?
>> I suspect walk_page_range*() callers might be affected,
> I rechecked the code and found that other architectures that support
> THP have defined pmd_leaf.
> So there is not problem on other architectures.

I meant other walk_page_range*() callers on loongarch might similarly be 
affected. IOW, KSM might not be the only bit being able to trigger such 
panics on loongarch.

-- 
Cheers,

David / dhildenb