From: Dmitry Osipenko <digetx@gmail.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Minchan Kim <minchan@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
joaodias@google.com, willy@infradead.org, david@redhat.com,
surenb@google.com, John Hubbard <jhubbard@nvidia.com>,
Nicolas Chauvet <kwizart@gmail.com>,
"linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>
Subject: Re: [PATCH v4] mm: cma: support sysfs
Date: Fri, 19 Mar 2021 18:38:00 +0300 [thread overview]
Message-ID: <78883205-e6da-5bc4-dcec-b6eb921567b1@gmail.com> (raw)
In-Reply-To: <YFS06OLp70nWWLFi@kroah.com>
19.03.2021 17:27, Greg Kroah-Hartman пишет:
> On Fri, Mar 19, 2021 at 05:19:47PM +0300, Dmitry Osipenko wrote:
>> 19.03.2021 16:51, Dmitry Osipenko пишет:
>>> 19.03.2021 16:47, Greg Kroah-Hartman пишет:
>>>> On Fri, Mar 19, 2021 at 04:45:21PM +0300, Dmitry Osipenko wrote:
>>>>> 19.03.2021 16:42, Greg Kroah-Hartman пишет:
>>>>>> On Fri, Mar 19, 2021 at 04:39:41PM +0300, Dmitry Osipenko wrote:
>>>>>>> 19.03.2021 15:44, Dmitry Osipenko пишет:
>>>>>>> ...
>>>>>>>>> #include <linux/debugfs.h>
>>>>>>>>> +#include <linux/kobject.h>
>>>>>>>>> +
>>>>>>>>> +struct cma_stat {
>>>>>>>>> + spinlock_t lock;
>>>>>>>>> + /* the number of CMA page successful allocations */
>>>>>>>>> + unsigned long nr_pages_succeeded;
>>>>>>>>> + /* the number of CMA page allocation failures */
>>>>>>>>> + unsigned long nr_pages_failed;
>>>>>>>>> + struct kobject kobj;
>>>>>>>>> +};
>>>>>>>>>
>>>>>>>>> struct cma {
>>>>>>>>> unsigned long base_pfn;
>>>>>>>>> @@ -16,6 +26,9 @@ struct cma {
>>>>>>>>> struct debugfs_u32_array dfs_bitmap;
>>>>>>>>> #endif
>>>>>>>>> char name[CMA_MAX_NAME];
>>>>>>>>> +#ifdef CONFIG_CMA_SYSFS
>>>>>>>>> + struct cma_stat *stat;
>>>>>>>>> +#endif
>>>>>>>
>>>>>>> What is the point of allocating stat dynamically?
>>>>>>
>>>>>> Because static kobjects make me cry.
>>>>>>
>>>>>
>>>>> I meant that it's already a part of struct cma, it looks like the stat
>>>>> could be embedded into struct cma and then kobj could be initialized
>>>>> separately.
>>>>
>>>> But that structure is statically allocated, so it can not be. This has
>>>> been discussed in the past threads for when this was reviewed if you are
>>>> curious :)
>>>
>>> Indeed, I missed that cma_areas[] is static, thank you.
>>>
>>
>> And in this case should be better to make only the kobj allocated
>> dynamically instead of the whole cma_stat.
>
> Why does it matter?
>
Then initialization order won't be a problem.
next prev parent reply other threads:[~2021-03-19 15:46 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-09 6:23 [PATCH v4] mm: cma: support sysfs Minchan Kim
2021-03-19 12:44 ` Dmitry Osipenko
2021-03-19 13:39 ` Dmitry Osipenko
2021-03-19 13:42 ` Greg Kroah-Hartman
2021-03-19 13:45 ` Dmitry Osipenko
2021-03-19 13:47 ` Greg Kroah-Hartman
2021-03-19 13:51 ` Dmitry Osipenko
2021-03-19 14:19 ` Dmitry Osipenko
2021-03-19 14:27 ` Greg Kroah-Hartman
2021-03-19 15:38 ` Dmitry Osipenko [this message]
2021-03-19 15:50 ` Greg Kroah-Hartman
2021-03-19 16:24 ` Dmitry Osipenko
2021-03-19 16:30 ` Minchan Kim
2021-03-19 17:29 ` Dmitry Osipenko
2021-03-19 17:41 ` Dmitry Osipenko
2021-03-19 17:44 ` Dmitry Osipenko
2021-03-19 18:07 ` Matthew Wilcox
2021-03-19 18:18 ` Minchan Kim
2021-03-19 18:59 ` Dmitry Osipenko
2021-03-19 19:00 ` Dmitry Osipenko
2021-03-19 17:56 ` Dmitry Osipenko
2021-03-19 18:21 ` Minchan Kim
2021-03-19 18:48 ` Dmitry Osipenko
2021-03-19 19:03 ` Minchan Kim
2021-03-19 19:24 ` Dmitry Osipenko
2021-03-20 7:52 ` Greg Kroah-Hartman
2021-03-22 14:44 ` Dmitry Osipenko
2021-03-19 13:45 ` Dmitry Osipenko
-- strict thread matches above, loose matches on Subject: below --
2021-03-04 16:17 Minchan Kim
2021-03-05 17:34 ` David Hildenbrand
2021-03-05 20:34 ` Minchan Kim
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