linux-kernel - Re: [PATCH RESEND v3 0/4] mm/hugetlb: fixes for PMD table sharing (incl. using mmu

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Message-ID: <84a00b16-0fd3-4a32-bb7a-f117dcdcf1e2@kernel.org>
Date: Thu, 15 Jan 2026 20:40:13 +0100
From: "David Hildenbrand (Red Hat)" <david@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
 linux-mm@...ck.org, Will Deacon <will@...nel.org>,
 "Aneesh Kumar K.V" <aneesh.kumar@...nel.org>, Nick Piggin
 <npiggin@...il.com>, Peter Zijlstra <peterz@...radead.org>,
 Arnd Bergmann <arnd@...db.de>, Muchun Song <muchun.song@...ux.dev>,
 Oscar Salvador <osalvador@...e.de>, "Liam R. Howlett"
 <Liam.Howlett@...cle.com>, Vlastimil Babka <vbabka@...e.cz>,
 Jann Horn <jannh@...gle.com>, Pedro Falcato <pfalcato@...e.de>,
 Rik van Riel <riel@...riel.com>, Harry Yoo <harry.yoo@...cle.com>,
 Laurence Oberman <loberman@...hat.com>,
 Prakash Sangappa <prakash.sangappa@...cle.com>,
 Nadav Amit <nadav.amit@...il.com>
Subject: Re: [PATCH RESEND v3 0/4] mm/hugetlb: fixes for PMD table sharing
 (incl. using mmu_gather)

On 1/15/26 19:05, Andrew Morton wrote:
> On Thu, 15 Jan 2026 17:22:30 +0000 Lorenzo Stoakes <lorenzo.stoakes@...cle.com> wrote:
> 
>> Any update on this series? It's a hotfix series and I don't see it queued
>> up anywhere in either mm-hotfixes-unstable or mm-hotfixes-stable, this
>> issue is causing ongoing problems for a lot of people, is there any reason
>> it's being delayed?
>>
>> It's received extensive approval and testing, so should be GTG right?
> 
> This has been in mm-unstable for a long time.  As the series had a
> mixture of cc:stable and not-cc:stable patches, I figured we'd merge
> them all into next merge window and let the -stable maintainers figure
> it all out.
> 
> As this is more urgent than I believed, we need to figure out what to
> do.
> 
> a) Pluck out the two cc:stable patches, merge just those into 6.19-rc.
> 
> b) Merge all of them into 6.19-rc, let -stable maintainers figure it out

Right. We can just CC: stable on comment fixes #2 and #3 to make 
back-porting easier.

> 
> c) Stick with my original plan.
> 
> <checks>
> 
> The cc:stable "mm/hugetlb: fix excessive IPI broadcasts when unsharing
> PMD tables using mmu_gather" has dependencies on the preceding two
> non-cc:stable patches.

At least one of them (doc update), yes.

> 
> So I'm thinking I add cc:stable to everything and send the whole series
> into 6.19-rcX.  wdyt?

Works for me.

> 
> 
> Also, David, where do we stand with
> 
> : I'd love to get some generic hugetlb testing on arm64 and powerpc,
> : that do hugetlb TLB flushing stuff a bit more special.
> :
> : I'll try doing some arm64 testing early in the new year myself.
> 
> ?

Not done yet, unfortunately. (I don't (yet) have easy access to decent 
arm64 hardware ;) )

I still hope that Jann could quickly have a look, but it's been a while 
already since I posted v1.

-- 
Cheers

David