linux-kernel - Re: [PATCH v2 1/3] mm/sparse: Add a static variable nr_present

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Message-Id: <20180222132441.51a8eae9e9656a82a2161070@linux-foundation.org>
Date:   Thu, 22 Feb 2018 13:24:41 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Baoquan He <bhe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, dave.hansen@...el.com,
        linux-mm@...ck.org, kirill.shutemov@...ux.intel.com,
        mhocko@...e.com, tglx@...utronix.de
Subject: Re: [PATCH v2 1/3] mm/sparse: Add a static variable
 nr_present_sections

On Thu, 22 Feb 2018 17:11:28 +0800 Baoquan He <bhe@...hat.com> 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.
> 
> --- a/mm/sparse.c
> +++ b/mm/sparse.c
> @@ -202,6 +202,7 @@ static inline int next_present_section_nr(int section_nr)
>  	      (section_nr <= __highest_present_section_nr));	\
>  	     section_nr = next_present_section_nr(section_nr))
>  
> +static int nr_present_sections;

I think this could be __initdata.

A nice comment explaining why it exists would be nice.