linux-kernel - Re: [PATCH RESEND v3 4/4] mm/hugetlb: fix excessive IPI broadcasts when unsharing PMD tables using mmu

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Message-ID: <bb3e8b8f-4af4-4e12-83b2-fed6e20edd64@kernel.org>
Date: Tue, 30 Dec 2025 23:00:55 +0100
From: "David Hildenbrand (Red Hat)" <david@...nel.org>
To: Harry Yoo <harry.yoo@...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>,
 Andrew Morton <akpm@...ux-foundation.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>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 Vlastimil Babka <vbabka@...e.cz>, Jann Horn <jannh@...gle.com>,
 Pedro Falcato <pfalcato@...e.de>, Rik van Riel <riel@...riel.com>,
 Laurence Oberman <loberman@...hat.com>,
 Prakash Sangappa <prakash.sangappa@...cle.com>,
 Nadav Amit <nadav.amit@...il.com>, stable@...r.kernel.org
Subject: Re: [PATCH RESEND v3 4/4] mm/hugetlb: fix excessive IPI broadcasts
 when unsharing PMD tables using mmu_gather

>>
>> Fixes: 1013af4f585f ("mm/hugetlb: fix huge_pmd_unshare() vs GUP-fast race")
>> Reported-by: Uschakow, Stanislav" <suschako@...zon.de>
>> Closes: https://lore.kernel.org/all/4d3878531c76479d9f8ca9789dc6485d@amazon.de/
>> Tested-by: Laurence Oberman <loberman@...hat.com>
>> Cc: <stable@...r.kernel.org>
>> Signed-off-by: David Hildenbrand (Red Hat) <david@...nel.org>
>> ---
> 
> Looks correct and nothing jumped out at me during review, so:
> Acked-by: Harry Yoo <harry.yoo@...cle.com>
> 

Thanks Harry! And thanks again for making me look again at the hugetlb 
mmu_gather horrors :)

-- 
Cheers

David