linux-kernel - Re: [RFC V1 PATCH mm-hotfixes 2/3] x86/mm: define p*d_populate

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Message-ID: <aHCMwOqzLrO8tzaq@hyeyoo>
Date: Fri, 11 Jul 2025 13:02:08 +0900
From: Harry Yoo <harry.yoo@...cle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Arnd Bergmann <arnd@...db.de>, Dennis Zhou <dennis@...nel.org>,
        Tejun Heo <tj@...nel.org>, Christoph Lameter <cl@...two.org>,
        "H . Peter Anvin" <hpa@...or.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Juergen Gross <jgross@...e.com>, Kevin Brodsky <kevin.brodsky@....com>,
        Muchun Song <muchun.song@...ux.dev>,
        Oscar Salvador <osalvador@...e.de>,
        Joao Martins <joao.m.martins@...cle.com>,
        Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
        Jane Chu <jane.chu@...cle.com>, Alistair Popple <apopple@...dia.com>,
        Mike Rapoport <rppt@...nel.org>,
        Gwan-gyeong Mun <gwan-gyeong.mun@...el.com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-mm@...ck.org, stable@...r.kernel.org
Subject: Re: [RFC V1 PATCH mm-hotfixes 2/3] x86/mm: define
 p*d_populate_kernel() and top-level page table sync

On Thu, Jul 10, 2025 at 05:27:36PM +0900, Harry Yoo wrote:
> On Wed, Jul 09, 2025 at 02:13:59PM -0700, Andrew Morton wrote:
> > On Wed,  9 Jul 2025 22:16:56 +0900 Harry Yoo <harry.yoo@...cle.com> wrote:
> > 
> > > Fixes: 4917f55b4ef9 ("mm/sparse-vmemmap: improve memory savings for compound devmaps")
> > > Fixes: faf1c0008a33 ("x86/vmemmap: optimize for consecutive sections in partial populated PMDs")
> > 
> > Fortunately both of these appeared in 6.9-rc7, which minimizes the
> > problem with having more than one Fixes:.
> > 
> > But still, the Fixes: is a pointer telling -stable maintainers where in
> > the kernel history we want them to insert the patch(es).  Giving them
> > multiple insertions points is confusing!  Can we narrow this down
> > to a single Fixes:?
> 
> If I had to choose only one I think it should be 4917f55b4ef9,
> since faf1c0008a33 is not yet known to be triggered without enlarging
> struct page (and once it's backported it fixes both of them).

On second look, faf1c0008a33 is introduced in v5.13-rc1 and
4917f55b4ef9 is introduced in v5.19-rc1.

I'll go with Fixes: faf1c0008a33 because it's introduced earlier.

> Will update in the next version.
> 
> -- 
> Cheers,
> Harry / Hyeonggon
> 

-- 
Cheers,
Harry / Hyeonggon