linux-kernel - Re: [PATCH] mm/gup: check page posion status for coredump.

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Date:   Thu, 18 Mar 2021 11:15:46 +0800
From:   Aili Yao <yaoaili@...gsoft.com>
To:     David Hildenbrand <david@...hat.com>
CC:     <akpm@...ux-foundation.org>, <naoya.horiguchi@....com>,
        <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <yangfeng1@...gsoft.com>, <sunhao2@...gsoft.com>,
        Oscar Salvador <osalvador@...e.de>,
        Mike Kravetz <mike.kravetz@...cle.com>, <yaoaili@...gsoft.com>
Subject: Re: [PATCH] mm/gup: check page posion status for coredump.

On Wed, 17 Mar 2021 10:12:02 +0100
David Hildenbrand <david@...hat.com> wrote:

> 
> I wonder if a simple
> 
> if (PageHWPoison(compound_head(page)))
> 	ret = 0;
> 
> won't suffice. But I guess the "issue" is compound pages that are not 
> huge pages or transparent huge pages.

Yes, the simple case won't suffice, as we mark the hugetlb page poison in head, and
other cases in the specific single page struct.

> If not, we certainly want a wrapper for that magic, otherwise we have to 
> replicate the same logic all over the place.
> 
> > +
> >   	return (ret == 1) ? page : NULL;
> >   }
> >   #endif /* CONFIG_ELF_CORE */
> >   
> 
> 

Yes, May other places meet the requirements as the coredump meets, it's better to make a
wrapper for this. But i am not familiar with the specific scenario, so this patch only cover
the coredump case.

I will post a v2 patch for this.

-- 
Thanks!
Aili Yao