linux-kernel - Re: [PATCH v1] arch/x86/mm/hugetlbpage.c: pud_huge() returns 0 when using 2-level paging

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Date:   Mon, 7 Nov 2022 16:10:59 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     HORIGUCHI NAOYA (堀口　直也) 
        <naoya.horiguchi@....com>
Cc:     Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        David Hildenbrand <david@...hat.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Miaohe Lin <linmiaohe@...wei.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: [PATCH v1] arch/x86/mm/hugetlbpage.c: pud_huge() returns 0 when
 using 2-level paging

On Tue, 8 Nov 2022 00:00:15 +0000 HORIGUCHI NAOYA(堀口　直也) <naoya.horiguchi@....com> wrote:

> > > Recently pud_huge() got aware of non-present entry by commit 3a194f3f8ad0
> > > ("mm/hugetlb: make pud_huge() and follow_huge_pud() aware of non-present
> > > pud entry") to handle some special states of gigantic page.  However, it's
> > > overlooked that pud_none() always returns false when running with 2-level
> > > paging, and as a result pmd_huge() can return true pointlessly.
> 
> Sorry, I found a non-negligible typo here (s/pmd_huge/pud_huge/).
> Andrew, could you fix this on mm-hotfixes-unstable?

Done, thanks.