linux-kernel - Re: [PATCH] memblock: use the helper macro for_each

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Message-ID: <f51f8028-ac7b-2c7d-0526-24c227f80c5c@huawei.com>
Date:   Thu, 15 Jun 2023 17:22:00 +0800
From:   "zhangpeng (AS)" <zhangpeng362@...wei.com>
To:     Mike Rapoport <rppt@...nel.org>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <akpm@...ux-foundation.org>, <wangkefeng.wang@...wei.com>,
        <sunnanyong@...wei.com>
Subject: Re: [PATCH] memblock: use the helper macro for_each_zone

On 2023/6/14 19:46, Mike Rapoport wrote:

> On Mon, Jun 12, 2023 at 08:51:02PM +0800, Peng Zhang wrote:
>> From: ZhangPeng <zhangpeng362@...wei.com>
>>
>> Let's use the helper macro for_each_zone to iterate over all memory
>> zones and reset the node managed pages. After that, we can remove the
>> unused function reset_node_managed_pages.
> Are you sure it's safe to use for_each_zone() in all users of
> reset_all_zones_managed_pages()?
>   

Thanks for your review.

Using for_each_zone() is indeed unsafe in some users of
reset_all_zones_managed_pages(). Please ignore.

Thanks,
Peng

>> Signed-off-by: ZhangPeng <zhangpeng362@...wei.com>
>> ---
>>   mm/memblock.c | 14 +++-----------
>>   1 file changed, 3 insertions(+), 11 deletions(-)
>>
>> diff --git a/mm/memblock.c b/mm/memblock.c
>> index da4264528e1e..af552604c3fb 100644
>> --- a/mm/memblock.c
>> +++ b/mm/memblock.c
>> @@ -2122,23 +2122,15 @@ static unsigned long __init free_low_memory_core_early(void)
>>   
>>   static int reset_managed_pages_done __initdata;
>>   
>> -static void __init reset_node_managed_pages(pg_data_t *pgdat)
>> -{
>> -	struct zone *z;
>> -
>> -	for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
>> -		atomic_long_set(&z->managed_pages, 0);
>> -}
>> -
>>   void __init reset_all_zones_managed_pages(void)
>>   {
>> -	struct pglist_data *pgdat;
>> +	struct zone *z;
>>   
>>   	if (reset_managed_pages_done)
>>   		return;
>>   
>> -	for_each_online_pgdat(pgdat)
>> -		reset_node_managed_pages(pgdat);
>> +	for_each_zone(z)
>> +		atomic_long_set(&z->managed_pages, 0);
>>   
>>   	reset_managed_pages_done = 1;
>>   }
>> -- 
>> 2.25.1
>>