linux-kernel - Re: [RFC 03/10] drivers: dax: use pgtable_has_pmd

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Message-ID: <9ce40155-2731-4dec-8c18-e27f13bf1872@kernel.org>
Date: Mon, 17 Nov 2025 18:28:26 +0100
From: "David Hildenbrand (Red Hat)" <david@...nel.org>
To: Luiz Capitulino <luizcap@...hat.com>, linux-kernel@...r.kernel.org,
 linux-mm@...ck.org
Cc: ryan.roberts@....com, akpm@...ux-foundation.org,
 lorenzo.stoakes@...cle.com
Subject: Re: [RFC 03/10] drivers: dax: use pgtable_has_pmd_leaves()

On 06.11.25 22:28, Luiz Capitulino wrote:
> dav_align_valid() uses has_transparent_hugepage() to check if PMD-sized
> pages are supported, use pgtable_has_pmd_leaves() instead.
> 
> Signed-off-by: Luiz Capitulino <luizcap@...hat.com>
> ---
>   drivers/dax/dax-private.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/dax/dax-private.h b/drivers/dax/dax-private.h
> index 0867115aeef2..10aeaec9e789 100644
> --- a/drivers/dax/dax-private.h
> +++ b/drivers/dax/dax-private.h
> @@ -117,7 +117,7 @@ static inline bool dax_align_valid(unsigned long align)
>   {
>   	if (align == PUD_SIZE && IS_ENABLED(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD))

As discussed offlist, it would be great to later also have this be

if (align == PUD_SIZE && pgtable_has_pud_leaves()

Acked-by: David Hildenbrand (Red Hat) <david@...nel.org>

-- 
Cheers

David