linux-kernel - Re: linux-next: KVM/s390x regression

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Message-ID: <f5debf87-0477-4d6a-8280-0cd95cd09412@linux.ibm.com>
Date: Mon, 20 Oct 2025 09:00:11 +0200
From: Christian Borntraeger <borntraeger@...ux.ibm.com>
To: Balbir Singh <balbirs@...dia.com>, David Hildenbrand <david@...hat.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>
Cc: Liam.Howlett@...cle.com, airlied@...il.com, akpm@...ux-foundation.org,
        apopple@...dia.com, baohua@...nel.org, baolin.wang@...ux.alibaba.com,
        byungchul@...com, dakr@...nel.org, dev.jain@....com,
        dri-devel@...ts.freedesktop.org, francois.dugast@...el.com,
        gourry@...rry.net, joshua.hahnjy@...il.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        lorenzo.stoakes@...cle.com, lyude@...hat.com, matthew.brost@...el.com,
        mpenttil@...hat.com, npache@...hat.com, osalvador@...e.de,
        rakie.kim@...com, rcampbell@...dia.com, ryan.roberts@....com,
        simona@...ll.ch, ying.huang@...ux.alibaba.com, ziy@...dia.com,
        kvm@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-next@...r.kernel.org
Subject: Re: linux-next: KVM/s390x regression

Am 17.10.25 um 23:56 schrieb Balbir Singh:

> In the meanwhile, does this fix/workaround work?
> 
> diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c
> index 0c847cdf4fd3..31c1754d5bd4 100644
> --- a/mm/pgtable-generic.c
> +++ b/mm/pgtable-generic.c
> @@ -290,7 +290,7 @@ pte_t *___pte_offset_map(pmd_t *pmd, unsigned long addr, pmd_t *pmdvalp)
>   
>   	if (pmdvalp)
>   		*pmdvalp = pmdval;
> -	if (unlikely(pmd_none(pmdval) || !pmd_present(pmdval)))
> +	if (unlikely(pmd_none(pmdval) || is_pmd_non_present_folio_entry(pmdval)))
>   		goto nomap;
>   	if (unlikely(pmd_trans_huge(pmdval)))
>   		goto nomap;
> 

Yes, this seems to work.

CC Claudio.