linux-kernel - Re: [PATCH v2 1/4] mm/sparse: Clean up the obsolete code comment

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Message-ID: <20190326092324.GJ28406@dhcp22.suse.cz>
Date:   Tue, 26 Mar 2019 10:23:24 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Baoquan He <bhe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org, rppt@...ux.ibm.com, osalvador@...e.de,
        willy@...radead.org, william.kucharski@...cle.com
Subject: Re: [PATCH v2 1/4] mm/sparse: Clean up the obsolete code comment

On Tue 26-03-19 17:02:24, 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 The code comment above sparse_add_one_section() is obsolete and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>

Please note that you need /** to start a kernel doc. Other than that.

Acked-by: Michal Hocko <mhocko@...e.com>
> ---
> v1-v2:
>   Add comments to explain what the returned value means for
>   each error code.
> 
>  mm/sparse.c | 15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/sparse.c b/mm/sparse.c
> index 69904aa6165b..b2111f996aa6 100644
> --- a/mm/sparse.c
> +++ b/mm/sparse.c
> @@ -685,9 +685,18 @@ static void free_map_bootmem(struct page *memmap)
>  #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