linux-kernel - Re: [PATCH] Doc fix for dget

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Date:   Thu, 11 Aug 2022 11:35:04 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Anup Parikh <parikhanupk.foss@...il.com>
Cc:     skhan@...uxfoundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Doc fix for dget_dlock



On 8/11/22 11:33, Randy Dunlap wrote:
> Hi--
> 
> On 8/11/22 07:48, Anup Parikh wrote:
>> Hello Mr. Randy Dunlap,
>>
>> I checked include/linux/dcache.h (dget() and dget_dlock()), include/linux/lockref.h and linux/lib/lockref.c.
>> My current knowledge is limited but I think:
>> 1) dget_dlock() directly increments the count variable without any atomicity guards.
>> 2) dget() does the same but with atomicity guarantee - even across multiple-cores on a multi-core system (according to https://stackoverflow.com/questions/36964478/understanding-synchronization-with-multiple-processors <https://stackoverflow.com/questions/36964478/understanding-synchronization-with-multiple-processors> and code in linux/lib/lockref.c).
>>
>> Please let me know if I should write the corresponding documentation and send a new patch.
> 
> Yes, please.
> Thanks.

also send the patch to linux-fsdevel@...r.kernel.org
since it touches filesystem code.

> 
>> Thanks and Regards,
>> Anup K Parikh.
>>
>>
>> On Tue, Aug 9, 2022 at 11:58 PM Randy Dunlap <rdunlap@...radead.org <mailto:rdunlap@...radead.org>> wrote:
>>
>>     Hi--
>>
>>     On 8/5/22 09:39, Anup K Parikh wrote:
>>     > Removes the warning for dget_dlock in include/linux/dcache.h and
>>     > enables generation of its API documentation
>>     >
>>     > Signed-off-by: Anup K Parikh <parikhanupk.foss@...il.com <mailto:parikhanupk.foss@...il.com>>
>>     > ---
>>     >  include/linux/dcache.h | 2 +-
>>     >  1 file changed, 1 insertion(+), 1 deletion(-)
>>     >
>>     > diff --git a/include/linux/dcache.h b/include/linux/dcache.h
>>     > index f5bba5148..ce0b36f72 100644
>>     > --- a/include/linux/dcache.h
>>     > +++ b/include/linux/dcache.h
>>     > @@ -297,7 +297,7 @@ extern char *dentry_path(const struct dentry *, char *, int);
>>     >  /* Allocation counts.. */
>>     > 
>>     >  /**
>>     > - *   dget, dget_dlock -      get a reference to a dentry
>>     > + *   dget_dlock -    get a reference to a dentry
>>     >   *   @dentry: dentry to get a reference to
>>     >   *
>>     >   *   Given a dentry or %NULL pointer increment the reference count
>>
>>     Someone was trying to document both dget() and get_dlock() with the same
>>     kernel-doc comment block.
>>     I suppose that you could duplicate the comments for dget() also.
>>
>>     It would be nice to know the difference(s) in the functions as well.
>>
>>     thanks.
>>     -- 
>>     ~Randy
>>
> 

-- 
~Randy