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

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Date:   Tue, 26 Mar 2019 17:36:42 +0800
From:   Chao Fan <fanc.fnst@...fujitsu.com>
To:     Baoquan He <bhe@...hat.com>
CC:     Michal Hocko <mhocko@...nel.org>, <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, Mar 26, 2019 at 05:30:57PM +0800, Baoquan He wrote:
>On 03/26/19 at 10:23am, Michal Hocko wrote:
>> 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 The code comment above sparse_add_one_section() is obsolete and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.
>
>I didn't find a template in coding-style.rst, and saw someone is using
>/*, others use /**. I will use '/**' instead. Thanks for telling.

How to format kernel-doc comments
---------------------------------

The opening comment mark ``/**`` is used for kernel-doc comments. The
``kernel-doc`` tool will extract comments marked this way. The rest of
the comment is formatted like a normal multi-line comment with a column
of asterisks on the left side, closing with ``*/`` on a line by itself.

See Documentation/doc-guide/kernel-doc.rst for more details.
Hope that can help you.

Thanks,
Chao Fan

>
>> 
>> 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
>
>