From: Wei Yang <richardw.yang@linux.intel.com>
To: David Hildenbrand <david@redhat.com>
Cc: Wei Yang <richardw.yang@linux.intel.com>,
akpm@linux-foundation.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, mhocko@suse.com,
yang.shi@linux.alibaba.com, rientjes@google.com
Subject: Re: [Patch v2 2/4] mm/migrate.c: wrap do_move_pages_to_node() and store_status()
Date: Thu, 30 Jan 2020 06:00:40 +0800 [thread overview]
Message-ID: <20200129220040.GB20736@richard> (raw)
In-Reply-To: <68d4f7fb-2f37-2b11-dd0f-2e059415daf2@redhat.com>
On Wed, Jan 29, 2020 at 10:28:53AM +0100, David Hildenbrand wrote:
>On 29.01.20 01:38, Wei Yang wrote:
>> On Tue, Jan 28, 2020 at 11:14:55AM +0100, David Hildenbrand wrote:
>>> On 22.01.20 02:16, Wei Yang wrote:
>>>> Usually do_move_pages_to_node() and store_status() is a pair. There are
>>>> three places call this pair of functions with almost the same form.
>>>
>>> I'd suggest
>>>
>>> "
>>> Usually, do_move_pages_to_node() and store_status() are used in
>>> combination. We have three similar call sites.
>>>
>>> Let's provide a wrapper for both function calls -
>>> move_pages_and_store_status - to make the calling code easier to
>>> maintain and fix (as noted by Yang Shi, the return value handling of
>>> do_move_pages_to_node() has a flaw).
>>> "
>>
>> Looks good.
>>
>>>
>>>>
>>>> This patch just wrap it to make it friendly to audience and also
>>>> consolidate the move and store action into one place. Also mentioned by
>>>> Yang Shi, the handling of do_move_pages_to_node()'s return value is not
>>>> proper. Now we can fix it in one place.
>>>>
>>>> Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
>>>> Acked-by: Michal Hocko <mhocko@suse.com>
>>>> ---
>>>> mm/migrate.c | 30 +++++++++++++++++++-----------
>>>> 1 file changed, 19 insertions(+), 11 deletions(-)
>>>>
>>>> diff --git a/mm/migrate.c b/mm/migrate.c
>>>> index 4c2a21856717..a4d3bd6475e1 100644
>>>> --- a/mm/migrate.c
>>>> +++ b/mm/migrate.c
>>>> @@ -1583,6 +1583,19 @@ static int add_page_for_migration(struct mm_struct *mm, unsigned long addr,
>>>> return err;
>>>> }
>>>>
>>>> +static int move_pages_and_store_status(struct mm_struct *mm, int node,
>>>> + struct list_head *pagelist, int __user *status,
>>>> + int start, int nr)
>>>
>>> nit: indentation
>>>
>>
>> You mean indent like this?
>>
>> static int move_pages_and_store_status(struct mm_struct *mm, int node,
>> struct list_head *pagelist,
>> int __user *status,
>>
>> This would be along list and I am afraid this is not the only valid code
>> style?
>
>Yes, that's what I meant. Documentation/process/coding-style.rst doesn't
>mention any specific way, but this is the most commonly used one.
>
>Indentation in this file mostly sticks to something like this as well,
>but yeah, it's often a mess and not consistent.
>
>That's why I note it whenever I see it, to make it eventually more
>consistent (and only make it a nit) :)
>
You are right. I would leave as it now, if someone else still have the same
suggestion to fix it.
Thanks :-)
>--
>Thanks,
>
>David / dhildenb
--
Wei Yang
Help you, Help me
next prev parent reply other threads:[~2020-01-29 22:00 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-22 1:16 [Patch v2 0/4] cleanup on do_pages_move() Wei Yang
2020-01-22 1:16 ` [Patch v2 1/4] mm/migrate.c: not necessary to check start and i Wei Yang
2020-01-28 10:04 ` David Hildenbrand
2020-01-29 0:32 ` Wei Yang
2020-01-22 1:16 ` [Patch v2 2/4] mm/migrate.c: wrap do_move_pages_to_node() and store_status() Wei Yang
2020-01-28 10:14 ` David Hildenbrand
2020-01-29 0:38 ` Wei Yang
2020-01-29 9:28 ` David Hildenbrand
2020-01-29 22:00 ` Wei Yang [this message]
2020-01-22 1:16 ` [Patch v2 3/4] mm/migrate.c: check pagelist in move_pages_and_store_status() Wei Yang
2020-01-28 10:21 ` David Hildenbrand
2020-01-29 0:46 ` Wei Yang
2020-01-29 9:36 ` David Hildenbrand
2020-01-22 1:16 ` [Patch v2 4/4] mm/migrate.c: handle same node and add failure in the same way Wei Yang
2020-01-29 10:13 ` David Hildenbrand
2020-01-29 22:07 ` Wei Yang
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