linux-kernel - Re: [PATCH v2] s390: fix HugeTLB vmemmap optimization crash

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Message-ID: <20251030145621.16837Bd6-hca@linux.ibm.com>
Date: Thu, 30 Oct 2025 15:56:21 +0100
From: Heiko Carstens <hca@...ux.ibm.com>
To: Luiz Capitulino <luizcap@...hat.com>
Cc: Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>, borntraeger@...ux.ibm.com,
        joao.m.martins@...cle.com, mike.kravetz@...cle.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-s390@...r.kernel.org, gor@...ux.ibm.com, agordeev@...ux.ibm.com,
        osalvador@...e.de, akpm@...ux-foundation.org, aneesh.kumar@...nel.org
Subject: Re: [PATCH v2] s390: fix HugeTLB vmemmap optimization crash

On Thu, Oct 30, 2025 at 10:54:47AM -0400, Luiz Capitulino wrote:
> On 2025-10-30 10:38, Gerald Schaefer wrote:
> > On Wed, 29 Oct 2025 13:49:53 +0100
> > Heiko Carstens <hca@...ux.ibm.com> wrote:
> > Therefore, we should disable ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP again, for
> > now. Doing it right would most likely require common code changes and
> > CRDTE / CSPG usage on s390. Not sure if this feature is really worth the
> > hassle, reading all the drawbacks that I mentioned in my commit 00a34d5a99c0
> > ("s390: select ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP").
> 
> OK, let's do the right thing. Do you plan to post a patch? I can do it
> if you would like.

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