linux-kernel - Re: [PATCH v2] mm: cma: support sysfs

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Date:   Mon, 8 Feb 2021 17:57:17 -0800
From:   John Hubbard <jhubbard@...dia.com>
To:     Minchan Kim <minchan@...nel.org>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-mm <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        <gregkh@...uxfoundation.org>, <surenb@...gle.com>,
        <joaodias@...gle.com>, <willy@...radead.org>
Subject: Re: [PATCH v2] mm: cma: support sysfs

On 2/8/21 3:36 PM, Minchan Kim wrote:
...
>>>    	char name[CMA_MAX_NAME];
>>> +#ifdef CONFIG_CMA_SYSFS
>>> +	struct cma_stat	*stat;
>>
>> This should not be a pointer. By making it a pointer, you've added a bunch of pointless
>> extra code to the implementation.
> 
> Originally, I went with the object lifetime with struct cma as you
> suggested to make code simple. However, Greg KH wanted to have
> release for kobj_type since it is consistent with other kboject
> handling.

Are you talking about the kobj in your new struct cma_stat? That seems
like circular logic if so. I'm guessing Greg just wanted kobj methods
to be used *if* you are dealing with kobjects. That's a narrower point.

I can't imagine that he would have insisted on having additional
allocations just so that kobj freeing methods could be used. :)


thanks,
-- 
John Hubbard
NVIDIA