linux-kernel - Re: [PATCH v2 3/3] mm,memory_hotplug: Remove unneeded declarations

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Date:   Wed, 2 Jun 2021 20:38:00 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Oscar Salvador <osalvador@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Michal Hocko <mhocko@...nel.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Pavel Tatashin <pasha.tatashin@...een.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] mm,memory_hotplug: Remove unneeded declarations

On 02.06.21 11:14, Oscar Salvador wrote:
> include/linux/memory_hotplug.h has the following declarations:
> 
> extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
> extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
> extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
> 
> These declarations were added by the following commit:
> 
> commit 3947be1969a9ce455ec30f60ef51efb10e4323d1
> Author: Dave Hansen <haveblue@...ibm.com>
> Date:   Sat Oct 29 18:16:54 2005 -0700
> 
>      [PATCH] memory hotplug: sysfs and add/remove functions
> 
> It seems that zone_grow_free_lists() and zone_grow_waitqueues() were
> never used, and add_one_highpage() was always declared as static in
> arch/i386/mm/init.c and later on in arch/x86/mm/init_32.c, and was
> later removed in:
> 
> commit 5e7ccf8635c93b493f7d378a57ce300fbe1484e8
> Author: Jiang Liu <liuj97@...il.com>
> Date:   Mon Apr 29 15:07:12 2013 -0700
> 
>      mm/x86: use free_highmem_page() to free highmem pages into buddy system
> 
> So remove these declarations.
> 
> Signed-off-by: Oscar Salvador <osalvador@...e.de>
> ---
>   include/linux/memory_hotplug.h | 3 ---
>   1 file changed, 3 deletions(-)
> 
> diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
> index 0d837ce6ec11..9a19e97d4f1a 100644
> --- a/include/linux/memory_hotplug.h
> +++ b/include/linux/memory_hotplug.h
> @@ -80,9 +80,6 @@ struct range mhp_get_pluggable_range(bool need_mapping);
>   /*
>    * Zone resizing functions
>    */
> -extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
> -extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
> -extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
>   extern void adjust_present_page_count(struct zone *zone, long nr_pages);
>   /* VM interface that may be used by firmware interface */
>   extern int mhp_init_memmap_on_memory(unsigned long pfn, unsigned long nr_pages,
> 

Right, that's a blast from the past. Thanks!

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Thanks,

David / dhildenb