linux-kernel - Re: [PATCH v1 4/9] mm/memory: Add tree limit to free

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Message-ID: <indhodowx3xwouam7l2lumqr7s4srupv7pdnaobmuaucljtpim@vxdepizcnxcg>
Date: Tue, 13 Jan 2026 14:19:26 -0500
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
To: David Hildenbrand <david@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, maple-tree@...ts.infradead.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>,
        Jann Horn <jannh@...gle.com>, Pedro Falcato <pfalcato@...e.de>,
        Charan Teja Kalla <quic_charante@...cinc.com>,
        shikemeng@...weicloud.com, kasong@...cent.com, nphamcs@...il.com,
        bhe@...hat.com, baohua@...nel.org, chrisl@...nel.org,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH v1 4/9] mm/memory: Add tree limit to free_pgtables()

* David Hildenbrand <david@...hat.com> [250911 05:24]:
> > +/*
> > + * free_pgtables() - Free a range of page tables
> > + * @tlb: The mmu gather
> > + * @mas: The maple state
> > + * @vma: The first vma
> > + * @floor: The lowest page table address
> > + * @ceiling: The highest page table address
> > + * @tree_max: The highest tree search address
> > + * @mm_wr_locked: boolean indicating if the mm is write locked
> 
> I'm sure there is a good reason why we don't call this stuff here
> 
> floor -> start
> ceiling -> end
> tree_max -> tree_end

It may not be the tree end.  The floor and ceiling names were here
before I arrived.  I think the floor and ceiling comes from the arch
definition part: USER_PGTABLES_CEILING, for example.