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Subject: Re: [PATCH v2 2/7] mm/sparse.c: introduce new function
 fill_subsection_map()
To:     Baoquan He <bhe@redhat.com>, linux-kernel@vger.kernel.org
Cc:     linux-mm@kvack.org, akpm@linux-foundation.org,
        richardw.yang@linux.intel.com, osalvador@suse.de,
        dan.j.williams@intel.com, mhocko@suse.com, rppt@linux.ibm.com,
        robin.murphy@arm.com
References: <20200220043316.19668-1-bhe@redhat.com>
 <20200220043316.19668-3-bhe@redhat.com>
From:   David Hildenbrand <david@redhat.com>
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Organization: Red Hat GmbH
Message-ID: <81082609-bac8-5071-c090-3b96f7b07b91@redhat.com>
Date:   Fri, 28 Feb 2020 15:27:07 +0100
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On 20.02.20 05:33, Baoquan He wrote:
> Wrap the codes filling subsection map from section_activate() into

"Factor out the code that fills the subsection" ...

> fill_subsection_map(), this makes section_activate() cleaner and
> easier to follow.
> 
> Signed-off-by: Baoquan He <bhe@redhat.com>
> ---
>  mm/sparse.c | 45 ++++++++++++++++++++++++++++++++++-----------
>  1 file changed, 34 insertions(+), 11 deletions(-)
> 
> diff --git a/mm/sparse.c b/mm/sparse.c
> index b8e52c8fed7f..977b47acd38d 100644
> --- a/mm/sparse.c
> +++ b/mm/sparse.c
> @@ -790,24 +790,28 @@ static void section_deactivate(unsigned long pfn, unsigned long nr_pages,
>  		ms->section_mem_map = (unsigned long)NULL;
>  }
>  
> -static struct page * __meminit section_activate(int nid, unsigned long pfn,
> -		unsigned long nr_pages, struct vmem_altmap *altmap)
> +/**
> + * fill_subsection_map - fill subsection map of a memory region
> + * @pfn - start pfn of the memory range
> + * @nr_pages - number of pfns to add in the region
> + *
> + * This fills the related subsection map inside one section, and only
> + * intended for hotplug.
> + *
> + * Return:
> + * * 0		- On success.
> + * * -EINVAL	- Invalid memory region.
> + * * -EEXIST	- Subsection map has been set.
> + */

Without this comment (or a massively reduced one :) )

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

-- 
Thanks,

David / dhildenb