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Subject: Re: [PATCH v3 1/2] mm/sparse: Clean up the obsolete code comment
To:     Baoquan He <bhe@redhat.com>, linux-kernel@vger.kernel.org
Cc:     linux-mm@kvack.org, rafael@kernel.org, akpm@linux-foundation.org,
        mhocko@suse.com, osalvador@suse.de, rppt@linux.ibm.com,
        willy@infradead.org, fanc.fnst@cn.fujitsu.com
References: <20190329082915.19763-1-bhe@redhat.com>
From:   Mukesh Ojha <mojha@codeaurora.org>
Message-ID: <1a1ff1d0-3bfa-4f06-1534-c49c63a8b58d@codeaurora.org>
Date:   Fri, 29 Mar 2019 16:10:44 +0530
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On 3/29/2019 1:59 PM, Baoquan He wrote:
> The code comment above sparse_add_one_section() is obsolete and
> incorrect, clean it up and write new one.
>
> Signed-off-by: Baoquan He <bhe@redhat.com>


Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>

Cheers,
-Mukesh

> ---
> v2->v3:
>    Normalize the code comment to use '/**' at 1st line of doc
>    above function.
> v1-v2:
>    Add comments to explain what the returned value means for
>    each error code.
>   mm/sparse.c | 17 +++++++++++++----
>   1 file changed, 13 insertions(+), 4 deletions(-)
>
> diff --git a/mm/sparse.c b/mm/sparse.c
> index 69904aa6165b..363f9d31b511 100644
> --- a/mm/sparse.c
> +++ b/mm/sparse.c
> @@ -684,10 +684,19 @@ static void free_map_bootmem(struct page *memmap)
>   #endif /* CONFIG_MEMORY_HOTREMOVE */
>   #endif /* CONFIG_SPARSEMEM_VMEMMAP */
>   
> -/*
> - * returns the number of sections whose mem_maps were properly
> - * set.  If this is <=0, then that means that the passed-in
> - * map was not consumed and must be freed.
> +/**
> + * sparse_add_one_section - add a memory section
> + * @nid: The node to add section on
> + * @start_pfn: start pfn of the memory range
> + * @altmap: device page map
> + *
> + * This is only intended for hotplug.
> + *
> + * Returns:
> + *   0 on success.
> + *   Other error code on failure:
> + *     - -EEXIST - section has been present.
> + *     - -ENOMEM - out of memory.
>    */
>   int __meminit sparse_add_one_section(int nid, unsigned long start_pfn,
>   				     struct vmem_altmap *altmap)