linux-kernel - Re: [PATCH v4 2/3] mm: Convert vmemmap_p?d

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Message-ID: <aVGadJAlS0Z6LLEl@kernel.org>
Date: Sun, 28 Dec 2025 23:00:36 +0200
From: Mike Rapoport <rppt@...nel.org>
To: chengkaitao <pilgrimtao@...il.com>
Cc: davem@...emloft.net, andreas@...sler.com, akpm@...ux-foundation.org,
	david@...nel.org, lorenzo.stoakes@...cle.com,
	Liam.Howlett@...cle.com, vbabka@...e.cz, surenb@...gle.com,
	mhocko@...e.com, kevin.brodsky@....com, dave.hansen@...ux.intel.com,
	ziy@...dia.com, chengkaitao@...inos.cn, willy@...radead.org,
	zhengqi.arch@...edance.com, sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v4 2/3] mm: Convert vmemmap_p?d_populate() to static
 functions

On Fri, Dec 19, 2025 at 07:58:11PM +0800, chengkaitao wrote:
> From: Chengkaitao <chengkaitao@...inos.cn>
> 
> Since the vmemmap_p?d_populate functions are unused outside the mm
> subsystem, we can remove their external declarations and convert
> them to static functions.
> 
> Signed-off-by: Chengkaitao <chengkaitao@...inos.cn>

Acked-by: Mike Rapoport (Microsoft) <rppt@...nel.org>

> ---
>  include/linux/mm.h  |  7 -------
>  mm/sparse-vmemmap.c | 10 +++++-----
>  2 files changed, 5 insertions(+), 12 deletions(-)
> 
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 15076261d0c2..d98a38a6ac0e 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -4234,13 +4234,6 @@ unsigned long section_map_size(void);
>  struct page * __populate_section_memmap(unsigned long pfn,
>  		unsigned long nr_pages, int nid, struct vmem_altmap *altmap,
>  		struct dev_pagemap *pgmap);
> -pgd_t *vmemmap_pgd_populate(unsigned long addr, int node);
> -p4d_t *vmemmap_p4d_populate(pgd_t *pgd, unsigned long addr, int node);
> -pud_t *vmemmap_pud_populate(p4d_t *p4d, unsigned long addr, int node);
> -pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node);
> -pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node,
> -			    struct vmem_altmap *altmap, unsigned long ptpfn,
> -			    unsigned long flags);
>  void *vmemmap_alloc_block(unsigned long size, int node);
>  struct vmem_altmap;
>  void *vmemmap_alloc_block_buf(unsigned long size, int node,
> diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
> index 37522d6cb398..67f9a08c2376 100644
> --- a/mm/sparse-vmemmap.c
> +++ b/mm/sparse-vmemmap.c
> @@ -151,7 +151,7 @@ void __meminit vmemmap_verify(pte_t *pte, int node,
>  			start, end - 1);
>  }
>  
> -pte_t * __meminit vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node,
> +static pte_t * __meminit vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node,
>  				       struct vmem_altmap *altmap,
>  				       unsigned long ptpfn, unsigned long flags)
>  {
> @@ -195,7 +195,7 @@ static void * __meminit vmemmap_alloc_block_zero(unsigned long size, int node)
>  	return p;
>  }
>  
> -pmd_t * __meminit vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node)
> +static pmd_t * __meminit vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node)
>  {
>  	pmd_t *pmd = pmd_offset(pud, addr);
>  	if (pmd_none(*pmd)) {
> @@ -208,7 +208,7 @@ pmd_t * __meminit vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node)
>  	return pmd;
>  }
>  
> -pud_t * __meminit vmemmap_pud_populate(p4d_t *p4d, unsigned long addr, int node)
> +static pud_t * __meminit vmemmap_pud_populate(p4d_t *p4d, unsigned long addr, int node)
>  {
>  	pud_t *pud = pud_offset(p4d, addr);
>  	if (pud_none(*pud)) {
> @@ -221,7 +221,7 @@ pud_t * __meminit vmemmap_pud_populate(p4d_t *p4d, unsigned long addr, int node)
>  	return pud;
>  }
>  
> -p4d_t * __meminit vmemmap_p4d_populate(pgd_t *pgd, unsigned long addr, int node)
> +static p4d_t * __meminit vmemmap_p4d_populate(pgd_t *pgd, unsigned long addr, int node)
>  {
>  	p4d_t *p4d = p4d_offset(pgd, addr);
>  	if (p4d_none(*p4d)) {
> @@ -234,7 +234,7 @@ p4d_t * __meminit vmemmap_p4d_populate(pgd_t *pgd, unsigned long addr, int node)
>  	return p4d;
>  }
>  
> -pgd_t * __meminit vmemmap_pgd_populate(unsigned long addr, int node)
> +static pgd_t * __meminit vmemmap_pgd_populate(unsigned long addr, int node)
>  {
>  	pgd_t *pgd = pgd_offset_k(addr);
>  	if (pgd_none(*pgd)) {
> -- 
> 2.50.1 (Apple Git-155)
> 

-- 
Sincerely yours,
Mike.