linux-kernel - Re: [PATCH 2/4] mm/memblock: introduce memblock_search_pfn

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Message-ID: <CACjP9X94yUxYWimmq1re7oTxhQUfbduVoJ0=iqPiWqV0cjUKng@mail.gmail.com>
Date:   Wed, 21 Mar 2018 11:14:57 +0100
From:   Daniel Vacek <neelx@...hat.com>
To:     Jia He <hejianet@...il.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Mel Gorman <mgorman@...e.de>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        AKASHI Takahiro <takahiro.akashi@...aro.org>,
        Gioh Kim <gi-oh.kim@...fitbricks.com>,
        Steven Sistare <steven.sistare@...cle.com>,
        Eugeniu Rosca <erosca@...adit-jv.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        open list <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        James Morse <james.morse@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Steve Capper <steve.capper@....com>, x86@...nel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Kemi Wang <kemi.wang@...el.com>,
        Petr Tesarik <ptesarik@...e.com>,
        YASUAKI ISHIMATSU <yasu.isimatu@...il.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Nikolay Borisov <nborisov@...e.com>,
        Jia He <jia.he@...-semitech.com>
Subject: Re: [PATCH 2/4] mm/memblock: introduce memblock_search_pfn_regions()

On Wed, Mar 21, 2018 at 9:09 AM, Jia He <hejianet@...il.com> wrote:
> This api is the preparation for further optimizing early_pfn_valid
>
> Signed-off-by: Jia He <jia.he@...-semitech.com>
> ---
>  include/linux/memblock.h |  2 ++
>  mm/memblock.c            | 12 ++++++++++++
>  2 files changed, 14 insertions(+)
>
> diff --git a/include/linux/memblock.h b/include/linux/memblock.h
> index 9471db4..5f46956 100644
> --- a/include/linux/memblock.h
> +++ b/include/linux/memblock.h
> @@ -203,6 +203,8 @@ void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn,
>              i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid))
>  #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
>
> +int memblock_search_pfn_regions(unsigned long pfn);
> +
>  unsigned long memblock_next_valid_pfn(unsigned long pfn, int *last_idx);
>  /**
>   * for_each_free_mem_range - iterate through free memblock areas
> diff --git a/mm/memblock.c b/mm/memblock.c
> index a9e8da4..f50fe5b 100644
> --- a/mm/memblock.c
> +++ b/mm/memblock.c
> @@ -1659,6 +1659,18 @@ static int __init_memblock memblock_search(struct memblock_type *type, phys_addr
>         return -1;
>  }
>
> +/* search memblock with the input pfn, return the region idx */
> +int __init_memblock memblock_search_pfn_regions(unsigned long pfn)
> +{
> +       struct memblock_type *type = &memblock.memory;
> +       int mid = memblock_search(type, PFN_PHYS(pfn));
> +
> +       if (mid == -1)
> +               return -1;

Why this?

> +       return mid;
> +}
> +
>  bool __init memblock_is_reserved(phys_addr_t addr)
>  {
>         return memblock_search(&memblock.reserved, addr) != -1;
> --
> 2.7.4
>