linux-kernel - Re: [RFC 07/10] treewide: rename has_transparent_hugepage() to arch_has_pmd

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Message-ID: <a64e9422-5474-46cf-9058-73aa29b7906e@kernel.org>
Date: Mon, 17 Nov 2025 18:45:11 +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 07/10] treewide: rename has_transparent_hugepage() to
 arch_has_pmd_leaves()

On 06.11.25 22:28, Luiz Capitulino wrote:
> Now that the majority of has_transparent_hugepage() callers have been
> converted to pgtable_has_pmd_leaves(), rename has_transparent_hugepage()
> to arch_has_pmd_leaves() since that's what the helper checks for.
> 
> arch_has_pmd_leaves() is supposed to be called only by
> init_arch_has_pmd_leaves(), except for two exeptions:
> 
> 1. shmem: shmem code runs very early during boot so it can't use
>     pgtable_has_pmd_leaves()

Can't we just initialize pgtable_has_pmd_leaves() earlier then?

> 2. hugepage_init(): just a temporary exception, this function will be
>     converted in a future commit
> 
> Signed-off-by: Luiz Capitulino <luizcap@...hat.com>
> ---


[...]

> diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
> index e4c5f70b0a01..02a2772ec548 100644
> --- a/include/linux/pgtable.h
> +++ b/include/linux/pgtable.h
> @@ -2026,8 +2026,8 @@ static inline bool pgtable_has_pmd_leaves(void)
>   #endif
>   #endif
>   
> -#ifndef has_transparent_hugepage
> -#define has_transparent_hugepage() IS_BUILTIN(CONFIG_TRANSPARENT_HUGEPAGE)
> +#ifndef arch_has_pmd_leaves
> +#define arch_has_pmd_leaves() IS_BUILTIN(CONFIG_TRANSPARENT_HUGEPAGE)
>   #endif

Ah, so it stays for now only set with CONFIG_TRANSPARENT_HUGEPAGE. I 
guess that's something to sort out later :)


-- 
Cheers

David