linux-kernel - Re: [PATCH 03/13] mm: Provide generic pmd_thp_or

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Message-ID: <ZZOhCuuozrBscdRC@x1n>
Date: Tue, 2 Jan 2024 13:37:14 +0800
From: Peter Xu <peterx@...hat.com>
To: Muchun Song <muchun.song@...ux.dev>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Matthew Wilcox <willy@...radead.org>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Lorenzo Stoakes <lstoakes@...il.com>,
	David Hildenbrand <david@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Mike Kravetz <mike.kravetz@...cle.com>,
	Mike Rapoport <rppt@...nel.org>,
	Christoph Hellwig <hch@...radead.org>,
	John Hubbard <jhubbard@...dia.com>,
	Andrew Jones <andrew.jones@...ux.dev>,
	linux-arm-kernel@...ts.infradead.org,
	Michael Ellerman <mpe@...erman.id.au>,
	"Kirill A . Shutemov" <kirill@...temov.name>,
	linuxppc-dev@...ts.ozlabs.org, Rik van Riel <riel@...riel.com>,
	linux-riscv@...ts.infradead.org, Yang Shi <shy828301@...il.com>,
	James Houghton <jthoughton@...gle.com>,
	"Aneesh Kumar K . V" <aneesh.kumar@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jason Gunthorpe <jgg@...dia.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Axel Rasmussen <axelrasmussen@...gle.com>
Subject: Re: [PATCH 03/13] mm: Provide generic pmd_thp_or_huge()

On Mon, Dec 25, 2023 at 02:29:53PM +0800, Muchun Song wrote:
> > @@ -1355,6 +1355,10 @@ static inline int pmd_write(pmd_t pmd)
> >   #endif /* pmd_write */
> >   #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> > +#ifndef pmd_thp_or_huge
> 
> I think it may be the time to rename to pmd_thp_or_hugetlb,
> the "huge" is really confusing. thp is not huge? Actually,
> it is huge. It is better to make it more specific from now on, like
> "hugetlb".

The rename will need to touch ARM code, which I wanted to avoid, see:

arch/arm64/include/asm/pgtable.h:#define pmd_thp_or_huge(pmd)   (pmd_huge(pmd) || pmd_trans_huge(pmd))

So far this series only touches generic code.  Would you mind I keep this
patch as-is, and leave renaming to later?

> 
> BTW, please cc me via the new email (muchun.song@...ux.dev) next edition.

Sure.  Thanks for taking a look.

-- 
Peter Xu