linux-kernel - Re: [PATVH v1 RESEND] mm: remove unused free_bootmem_with_active

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Message-ID: <20200402150942.GT22681@dhcp22.suse.cz>
Date:   Thu, 2 Apr 2020 17:09:42 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Baoquan He <bhe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org
Subject: Re: [PATVH v1 RESEND] mm: remove unused
 free_bootmem_with_active_regions

On Thu 02-04-20 22:34:55, Baoquan He wrote:
> Since commit 397dc00e249ec64e10 ("mips: sgi-ip27: switch from DISCONTIGMEM
> to SPARSEMEM"), the last caller of free_bootmem_with_active_regions() was
> gone. Now no user calls it any more.
> 
> Let's remove it.
> 
> Signed-off-by: Baoquan He <bhe@...hat.com>

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

> ---
> RESEND:
>   To add linux-mm to CC list.
> 
>  include/linux/mm.h |  4 ----
>  mm/page_alloc.c    | 25 -------------------------
>  2 files changed, 29 deletions(-)
> 
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 1cd8b8f8534d..9c093f7c751d 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -2363,8 +2363,6 @@ static inline unsigned long get_num_physpages(void)
>   * 	memblock_add_node(base, size, nid)
>   * free_area_init_nodes(max_zone_pfns);
>   *
> - * free_bootmem_with_active_regions() calls free_bootmem_node() for each
> - * registered physical page range.  Similarly
>   * sparse_memory_present_with_active_regions() calls memory_present() for
>   * each range when SPARSEMEM is enabled.
>   *
> @@ -2380,8 +2378,6 @@ extern unsigned long absent_pages_in_range(unsigned long start_pfn,
>  extern void get_pfn_range_for_nid(unsigned int nid,
>  			unsigned long *start_pfn, unsigned long *end_pfn);
>  extern unsigned long find_min_pfn_with_active_regions(void);
> -extern void free_bootmem_with_active_regions(int nid,
> -						unsigned long max_low_pfn);
>  extern void sparse_memory_present_with_active_regions(int nid);
>  
>  #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 138a56c0f48f..2892ebeaa6c9 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -6356,31 +6356,6 @@ int __meminit __early_pfn_to_nid(unsigned long pfn,
>  }
>  #endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */
>  
> -/**
> - * free_bootmem_with_active_regions - Call memblock_free_early_nid for each active range
> - * @nid: The node to free memory on. If MAX_NUMNODES, all nodes are freed.
> - * @max_low_pfn: The highest PFN that will be passed to memblock_free_early_nid
> - *
> - * If an architecture guarantees that all ranges registered contain no holes
> - * and may be freed, this this function may be used instead of calling
> - * memblock_free_early_nid() manually.
> - */
> -void __init free_bootmem_with_active_regions(int nid, unsigned long max_low_pfn)
> -{
> -	unsigned long start_pfn, end_pfn;
> -	int i, this_nid;
> -
> -	for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, &this_nid) {
> -		start_pfn = min(start_pfn, max_low_pfn);
> -		end_pfn = min(end_pfn, max_low_pfn);
> -
> -		if (start_pfn < end_pfn)
> -			memblock_free_early_nid(PFN_PHYS(start_pfn),
> -					(end_pfn - start_pfn) << PAGE_SHIFT,
> -					this_nid);
> -	}
> -}
> -
>  /**
>   * sparse_memory_present_with_active_regions - Call memory_present for each active range
>   * @nid: The node to call memory_present for. If MAX_NUMNODES, all nodes will be used.
> -- 
> 2.17.2
> 

-- 
Michal Hocko
SUSE Labs