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

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Message-ID: <20190326093057.GS3659@MiWiFi-R3L-srv>
Date:   Tue, 26 Mar 2019 17:30:57 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Michal Hocko <mhocko@...nel.org>
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 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 The code comment above sparse_add_one_section() is obsolete and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.

> 
> 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