linux-kernel - Re: [PATCH 09/16] mm/page_alloc: use local variable zone

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Date:   Thu, 15 Sep 2022 16:06:18 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     Oscar Salvador <osalvador@...e.de>
CC:     <akpm@...ux-foundation.org>, <david@...hat.com>,
        <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 09/16] mm/page_alloc: use local variable zone_idx directly

On 2022/9/15 15:36, Oscar Salvador wrote:
> On Fri, Sep 09, 2022 at 05:24:44PM +0800, Miaohe Lin wrote:
>> Use local variable zone_idx directly since it holds the exact value of
>> zone_idx(). No functional change intended.
>>
>> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> 
> By the way, zone_idx being "int" should be enough?

Yes, it should be. But zone_idx is used as "unsigned long" around this function,
e.g. __init_zone_device_page expects zone_idx as "unsigned long", so it should be
better to keep it as is ?

> 
> Reviewed-by: Oscar Salvador <osalvador@...e.de>

Many thanks for your review and comment in this series.

Thanks,
Miaohe Lin


> 
>> ---
>>  mm/page_alloc.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
>> index 94baf33da865..3417232afa45 100644
>> --- a/mm/page_alloc.c
>> +++ b/mm/page_alloc.c
>> @@ -6878,7 +6878,7 @@ void __ref memmap_init_zone_device(struct zone *zone,
>>  	unsigned long start = jiffies;
>>  	int nid = pgdat->node_id;
>>  
>> -	if (WARN_ON_ONCE(!pgmap || zone_idx(zone) != ZONE_DEVICE))
>> +	if (WARN_ON_ONCE(!pgmap || zone_idx != ZONE_DEVICE))
>>  		return;
>>  
>>  	/*
>> -- 
>> 2.23.0
>>
>