Re: [PATCH 2/3] mm, treewide: replace __folio_alloc_node() with folio_alloc_node()

[Gregory Price <gourry@gourry.net>]

On Thu, Jul 16, 2026 at 02:30:11PM +0000, Brendan Jackman wrote:
> Commit 5b584d2d22dca ("mm: remove __alloc_pages_node()") removed the __
> variant of alloc_pages_node(), after users had been migrated off it,
> since it just complicates the API (requiring users to handle
> NUMA_NO_NODE, or risking hotplug bugs) for no real benefit.
> 
> This patch brings __folio_alloc_node() into line too for exactly the
> same reasons (including the ulterior motive of freeing up the __ variant
> for use as an internal API).
> 
> This time, it's done as a single patch because A) the users are fewer
> and B) folio_alloc_node() does not already exist like
> alloc_pages_node() did.
> 
> No functional change intended.
> 
> Suggested-by: "Vlastimil Babka (SUSE)" <vbabka@kernel.org>
> Link: https://lore.kernel.org/all/ed4572f4-0074-45c5-993d-7b6533eddc31@kernel.org/
> Signed-off-by: Brendan Jackman <jackmanb@google.com>

Reviewed-by: Gregory Price <gourry@gourry.net>

> ---
>  drivers/iommu/iommu-pages.c        |  9 +--------
>  drivers/irqchip/irq-loongarch-ir.c |  4 ++--
>  include/linux/gfp.h                | 12 +++---------
>  mm/filemap.c                       |  2 +-
>  mm/migrate.c                       |  2 +-
>  mm/page_alloc.c                    | 17 +++++++++++++++--
>  net/sunrpc/svc.c                   |  2 +-
>  7 files changed, 24 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/iommu/iommu-pages.c b/drivers/iommu/iommu-pages.c
> index 3bab175d85571..47e0759f0e0ae 100644
> --- a/drivers/iommu/iommu-pages.c
> +++ b/drivers/iommu/iommu-pages.c
> @@ -56,14 +56,7 @@ void *iommu_alloc_pages_node_sz(int nid, gfp_t gfp, size_t size)
>  	 */
>  	order = get_order(size);
>  
> -	/*
> -	 * __folio_alloc_node() does not handle NUMA_NO_NODE like
> -	 * alloc_pages_node() did.
> -	 */
> -	if (nid == NUMA_NO_NODE)
> -		nid = numa_mem_id();
> -
> -	folio = __folio_alloc_node(gfp | __GFP_ZERO, order, nid);
> +	folio = folio_alloc_node(gfp | __GFP_ZERO, order, nid);
>  	if (unlikely(!folio))
>  		return NULL;
>  
> diff --git a/drivers/irqchip/irq-loongarch-ir.c b/drivers/irqchip/irq-loongarch-ir.c
> index 21c649a89a706..427f7fd3cad42 100644
> --- a/drivers/irqchip/irq-loongarch-ir.c
> +++ b/drivers/irqchip/irq-loongarch-ir.c
> @@ -384,7 +384,7 @@ static int redirect_table_init(struct redirect_desc *irde)
>  	unsigned long *bitmap;
>  	struct folio *folio;
>  
> -	folio = __folio_alloc_node(GFP_KERNEL | __GFP_ZERO, IRD_TABLE_PAGE_ORDER, irde->node);
> +	folio = folio_alloc_node(GFP_KERNEL | __GFP_ZERO, IRD_TABLE_PAGE_ORDER, irde->node);
>  	if (!folio) {
>  		pr_err("Node [%d] redirect table alloc pages failed!\n", irde->node);
>  		return -ENOMEM;
> @@ -410,7 +410,7 @@ static int redirect_queue_init(struct redirect_desc *irde)
>  	struct redirect_queue *inv_queue = &irde->inv_queue;
>  	struct folio *folio;
>  
> -	folio = __folio_alloc_node(GFP_KERNEL | __GFP_ZERO, INV_QUEUE_PAGE_ORDER, irde->node);
> +	folio = folio_alloc_node(GFP_KERNEL | __GFP_ZERO, INV_QUEUE_PAGE_ORDER, irde->node);
>  	if (!folio) {
>  		pr_err("Node [%d] invalid queue alloc pages failed!\n", irde->node);
>  		return -ENOMEM;
> diff --git a/include/linux/gfp.h b/include/linux/gfp.h
> index e4e974a6e5f90..572605d84e30e 100644
> --- a/include/linux/gfp.h
> +++ b/include/linux/gfp.h
> @@ -251,15 +251,9 @@ static inline void warn_if_node_offline(int this_node, gfp_t gfp_mask)
>  	dump_stack();
>  }
>  
> -static inline
> -struct folio *__folio_alloc_node_noprof(gfp_t gfp, unsigned int order, int nid)
> -{
> -	warn_if_node_offline(nid, gfp);
> +struct folio *folio_alloc_node_noprof(gfp_t gfp, unsigned int order, int nid);
>  
> -	return __folio_alloc_noprof(gfp, order, nid, NULL);
> -}
> -
> -#define  __folio_alloc_node(...)		alloc_hooks(__folio_alloc_node_noprof(__VA_ARGS__))
> +#define  folio_alloc_node(...)		alloc_hooks(folio_alloc_node_noprof(__VA_ARGS__))
>  
>  /*
>   * Allocate pages, preferring the node given as nid. When nid == NUMA_NO_NODE,
> @@ -282,7 +276,7 @@ static inline struct page *alloc_pages_noprof(gfp_t gfp_mask, unsigned int order
>  }
>  static inline struct folio *folio_alloc_noprof(gfp_t gfp, unsigned int order)
>  {
> -	return __folio_alloc_node_noprof(gfp, order, numa_node_id());
> +	return folio_alloc_node_noprof(gfp, order, numa_node_id());
>  }
>  static inline struct folio *vma_alloc_folio_noprof(gfp_t gfp, int order,
>  		struct vm_area_struct *vma, unsigned long addr)
> diff --git a/mm/filemap.c b/mm/filemap.c
> index 0dd8e2a15d746..1cf91970a6850 100644
> --- a/mm/filemap.c
> +++ b/mm/filemap.c
> @@ -1007,7 +1007,7 @@ struct folio *filemap_alloc_folio_noprof(gfp_t gfp, unsigned int order,
>  		do {
>  			cpuset_mems_cookie = read_mems_allowed_begin();
>  			n = cpuset_mem_spread_node();
> -			folio = __folio_alloc_node_noprof(gfp, order, n);
> +			folio = folio_alloc_node_noprof(gfp, order, n);
>  		} while (!folio && read_mems_allowed_retry(cpuset_mems_cookie));
>  
>  		return folio;
> diff --git a/mm/migrate.c b/mm/migrate.c
> index 222c8c15f782f..b7836b02f32db 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -2682,7 +2682,7 @@ static struct folio *alloc_misplaced_dst_folio(struct folio *src,
>  			__GFP_NOWARN;
>  		gfp &= ~__GFP_RECLAIM;
>  	}
> -	return __folio_alloc_node(gfp, order, nid);
> +	return folio_alloc_node(gfp, order, nid);
>  }
>  
>  /*
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 37a3c1c00e169..86922270df157 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -5435,12 +5435,25 @@ EXPORT_SYMBOL(alloc_pages_node_noprof);
>  struct folio *__folio_alloc_noprof(gfp_t gfp, unsigned int order, int preferred_nid,
>  		nodemask_t *nodemask)
>  {
> -	struct page *page = __alloc_pages_noprof(gfp | __GFP_COMP, order,
> -					preferred_nid, nodemask, ALLOC_DEFAULT);
> +	struct page *page;
> +
> +	if (preferred_nid == NUMA_NO_NODE)
> +		preferred_nid = numa_mem_id();
> +
> +	warn_if_node_offline(preferred_nid, gfp);
> +
> +	page = __alloc_pages_noprof(gfp | __GFP_COMP, order,
> +				    preferred_nid, nodemask, ALLOC_DEFAULT);
>  	return page_rmappable_folio(page);
>  }
>  EXPORT_SYMBOL(__folio_alloc_noprof);
>  
> +struct folio *folio_alloc_node_noprof(gfp_t gfp, unsigned int order, int nid)
> +{
> +	return __folio_alloc_noprof(gfp, order, nid, NULL);
> +}
> +EXPORT_SYMBOL(folio_alloc_node_noprof);
> +
>  /*
>   * Common helper functions. Never use with __GFP_HIGHMEM because the returned
>   * address cannot represent highmem pages. Use alloc_pages and then kmap if
> diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
> index ae9ec4bf34f72..74350a2e07036 100644
> --- a/net/sunrpc/svc.c
> +++ b/net/sunrpc/svc.c
> @@ -711,7 +711,7 @@ svc_prepare_thread(struct svc_serv *serv, struct svc_pool *pool, int node)
>  	rqstp->rq_server = serv;
>  	rqstp->rq_pool = pool;
>  
> -	rqstp->rq_scratch_folio = __folio_alloc_node(GFP_KERNEL, 0, node);
> +	rqstp->rq_scratch_folio = folio_alloc_node(GFP_KERNEL, 0, node);
>  	if (!rqstp->rq_scratch_folio)
>  		goto out_enomem;
>  
> 
> -- 
> 2.54.0
> 
>