linux-kernel - Re: [mm-unstable PATCH v4 5/9] mm, hwpoison: make unpoison aware of raw error info in hwpoisoned hugepage

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Message-ID: <20220707013500.GA2578896@hori.linux.bs1.fc.nec.co.jp>
Date:   Thu, 7 Jul 2022 01:35:01 +0000
From:   HORIGUCHI NAOYA(堀口　直也) 
        <naoya.horiguchi@....com>
To:     Miaohe Lin <linmiaohe@...wei.com>
CC:     Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Liu Shixin <liushixin2@...wei.com>,
        Yang Shi <shy828301@...il.com>,
        Oscar Salvador <osalvador@...e.de>,
        Muchun Song <songmuchun@...edance.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [mm-unstable PATCH v4 5/9] mm, hwpoison: make unpoison aware of
 raw error info in hwpoisoned hugepage

On Wed, Jul 06, 2022 at 11:06:28PM +0000, HORIGUCHI NAOYA(堀口 直也) wrote:
> On Wed, Jul 06, 2022 at 10:58:53AM +0800, Miaohe Lin wrote:
> > On 2022/7/4 9:33, Naoya Horiguchi wrote:
> > > From: Naoya Horiguchi <naoya.horiguchi@....com>
> > > 
> > > Raw error info list needs to be removed when hwpoisoned hugetlb is
> > > unpoisoned.  And unpoison handler needs to know how many errors there
> > > are in the target hugepage. So add them.
> > > 
> > > Signed-off-by: Naoya Horiguchi <naoya.horiguchi@....com>
> > > ---
> > > @@ -2287,6 +2301,7 @@ int unpoison_memory(unsigned long pfn)
> > 
> > Is it safe to unpoison hugepage when HPageRawHwpUnreliable? I'm afraid because
> > some raw error info is missing..
> 
> Ah, right. We need prevent it.  I'll fix it by inserting the check.
> 
>  static inline long free_raw_hwp_pages(struct page *hpage, bool move_flag)
>  {
>          struct llist_head *head;
>          struct llist_node *t, *tnode;
>          long count = 0;
>  
> +        if (!HPageRawHwpUnreliable(hpage))
> +                return 0;

No, I meant "if (HPageRawHwpUnreliable(hpage))", sorry for the noise :(

- Naoya Horiguchi