linux-kernel - Re: [PATCH v3 1/2] mm/sparse: Clean up the obsolete code comment

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Message-ID: <20190329091418.GE28616@dhcp22.suse.cz>
Date:   Fri, 29 Mar 2019 10:14:18 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Baoquan He <bhe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        rafael@...nel.org, akpm@...ux-foundation.org, osalvador@...e.de,
        rppt@...ux.ibm.com, willy@...radead.org, fanc.fnst@...fujitsu.com
Subject: Re: [PATCH v3 1/2] mm/sparse: Clean up the obsolete code comment

On Fri 29-03-19 16:29:14, 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 The code comment above sparse_add_one_section() is obsolete and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@...hat.com>

Acked-by: Michal Hocko <mhocko@...e.com>

> ---
> 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)
> -- 
> 2.17.2
> 

-- 
Michal Hocko
SUSE Labs