linux-kernel - Re: [PATCH 1/4] mm: move function alloc_pages_exact_nid out of _

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Date:   Tue, 26 Sep 2017 15:35:25 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Ganapatrao Kulkarni <ganapatrao.kulkarni@...ium.com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, linux-mm@...ck.org,
        Will.Deacon@....com, robin.murphy@....com,
        lorenzo.pieralisi@....com, hanjun.guo@...aro.org, joro@...tes.org,
        vbabka@...e.cz, akpm@...ux-foundation.org,
        Tomasz.Nowicki@...ium.com, Robert.Richter@...ium.com,
        jnair@...iumnetworks.com, gklkml16@...il.com
Subject: Re: [PATCH 1/4] mm: move function alloc_pages_exact_nid out of
 __meminit

On Thu 21-09-17 14:29:19, Ganapatrao Kulkarni wrote:
> This function can be used on NUMA systems in place of alloc_pages_exact
> Adding code to export and to remove __meminit section tagging.

It is usually better to fold such a change into a patch which adds a new
user. Other than that I do not have any objections.

> Signed-off-by: Ganapatrao Kulkarni <ganapatrao.kulkarni@...ium.com>

Acked-by: Michal Hocko <mhocko@...e.com>

> ---
>  include/linux/gfp.h | 2 +-
>  mm/page_alloc.c     | 3 ++-
>  2 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/gfp.h b/include/linux/gfp.h
> index f780718..a4bd234 100644
> --- a/include/linux/gfp.h
> +++ b/include/linux/gfp.h
> @@ -528,7 +528,7 @@ extern unsigned long get_zeroed_page(gfp_t gfp_mask);
>  
>  void *alloc_pages_exact(size_t size, gfp_t gfp_mask);
>  void free_pages_exact(void *virt, size_t size);
> -void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask);
> +void *alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask);
>  
>  #define __get_free_page(gfp_mask) \
>  		__get_free_pages((gfp_mask), 0)
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index c841af8..7975870 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -4442,7 +4442,7 @@ EXPORT_SYMBOL(alloc_pages_exact);
>   * Like alloc_pages_exact(), but try to allocate on node nid first before falling
>   * back.
>   */
> -void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask)
> +void *alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask)
>  {
>  	unsigned int order = get_order(size);
>  	struct page *p = alloc_pages_node(nid, gfp_mask, order);
> @@ -4450,6 +4450,7 @@ void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask)
>  		return NULL;
>  	return make_alloc_exact((unsigned long)page_address(p), order, size);
>  }
> +EXPORT_SYMBOL(alloc_pages_exact_nid);
>  
>  /**
>   * free_pages_exact - release memory allocated via alloc_pages_exact()
> -- 
> 2.9.4
> 

-- 
Michal Hocko
SUSE Labs