linux-kernel - Re: [PATCH v6 1/5] mm/sparse: Add a static variable nr_present

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Message-ID: <20180628112409.GB12956@techadventures.net>
Date:   Thu, 28 Jun 2018 13:24:09 +0200
From:   Oscar Salvador <osalvador@...hadventures.net>
To:     Baoquan He <bhe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        dave.hansen@...el.com, pagupta@...hat.com,
        Pavel Tatashin <pasha.tatashin@...cle.com>, linux-mm@...ck.org,
        kirill.shutemov@...ux.intel.com
Subject: Re: [PATCH v6 1/5] mm/sparse: Add a static variable
 nr_present_sections

On Thu, Jun 28, 2018 at 02:28:53PM +0800, Baoquan He wrote:
> It's used to record how many memory sections are marked as present
> during system boot up, and will be used in the later patch.
> 
> Signed-off-by: Baoquan He <bhe@...hat.com>
> Reviewed-by: Pavel Tatashin <pasha.tatashin@...cle.com>

Reviewed-by: Oscar Salvador <osalvador@...e.de>

> ---
>  mm/sparse.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/mm/sparse.c b/mm/sparse.c
> index f13f2723950a..6314303130b0 100644
> --- a/mm/sparse.c
> +++ b/mm/sparse.c
> @@ -200,6 +200,12 @@ static inline int next_present_section_nr(int section_nr)
>  	      (section_nr <= __highest_present_section_nr));	\
>  	     section_nr = next_present_section_nr(section_nr))
>  
> +/*
> + * Record how many memory sections are marked as present
> + * during system bootup.
> + */
> +static int __initdata nr_present_sections;
> +
>  /* Record a memory area against a node. */
>  void __init memory_present(int nid, unsigned long start, unsigned long end)
>  {
> @@ -229,6 +235,7 @@ void __init memory_present(int nid, unsigned long start, unsigned long end)
>  			ms->section_mem_map = sparse_encode_early_nid(nid) |
>  							SECTION_IS_ONLINE;
>  			section_mark_present(ms);
> +			nr_present_sections++;
>  		}
>  	}
>  }
> -- 
> 2.13.6
> 

-- 
Oscar Salvador
SUSE L3