linux-kernel - Re: [PATCH] mm/memory-failure: Fix return wrong value when isolate page fail

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Date:   Sun, 30 Aug 2020 22:27:18 +0000
From:   HORIGUCHI NAOYA(堀口　直也) 
        <naoya.horiguchi@....com>
To:     Qian Cai <cai@....pw>, Muchun Song <songmuchun@...edance.com>
CC:     "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/memory-failure: Fix return wrong value when isolate
 page fail

On Sun, Aug 30, 2020 at 03:44:18PM -0400, Qian Cai wrote:
> On Sun, Aug 30, 2020 at 04:10:53PM +0800, Muchun Song wrote:
> > When we isolate page fail, we should not return 0, because we do not
> > set page HWPoison on any page.
> > 
> > Signed-off-by: Muchun Song <songmuchun@...edance.com>
> 
> This seems solve the problem for me that madvise(MADV_SOFT_OFFLINE) will run
> into ENOMEM eventually:
> 
> https://lore.kernel.org/lkml/20200811220643.GB39857@lca.pw/
> 
> Reviewed-by: Qian Cai <cai@....pw>

Thank you very much, both of you!

Acked-by: Naoya Horiguchi <naoya.horiguchi@....com>

> > ---
> >  mm/memory-failure.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> > index 696505f56910..4eb3c42ffe35 100644
> > --- a/mm/memory-failure.c
> > +++ b/mm/memory-failure.c
> > @@ -1850,6 +1850,7 @@ static int __soft_offline_page(struct page *page)
> >  	} else {
> >  		pr_info("soft offline: %#lx: %s isolation failed: %d, page count %d, type %lx (%pGp)\n",
> >  			pfn, msg_page[huge], ret, page_count(page), page->flags, &page->flags);
> > +		ret = -EBUSY;
> >  	}
> >  	return ret;
> >  }
> > -- 
> > 2.11.0
> > 
> > 
>