linux-kernel - Re: [PATCH v6 09/10] mm/memory_hotplug: Drop local variables in shrink_zone

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Date:   Tue, 4 Feb 2020 10:29:18 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Oscar Salvador <osalvador@...e.de>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, x86@...nel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Wei Yang <richardw.yang@...ux.intel.com>
Subject: Re: [PATCH v6 09/10] mm/memory_hotplug: Drop local variables in
 shrink_zone_span()

On 04.02.20 10:26, Oscar Salvador wrote:
> On Sun, Oct 06, 2019 at 10:56:45AM +0200, David Hildenbrand wrote:
>> Get rid of the unnecessary local variables.
>>
>> Cc: Andrew Morton <akpm@...ux-foundation.org>
>> Cc: Oscar Salvador <osalvador@...e.de>
>> Cc: David Hildenbrand <david@...hat.com>
>> Cc: Michal Hocko <mhocko@...e.com>
>> Cc: Pavel Tatashin <pasha.tatashin@...een.com>
>> Cc: Dan Williams <dan.j.williams@...el.com>
>> Cc: Wei Yang <richardw.yang@...ux.intel.com>
>> Signed-off-by: David Hildenbrand <david@...hat.com>
>> ---
>>  mm/memory_hotplug.c | 15 ++++++---------
>>  1 file changed, 6 insertions(+), 9 deletions(-)
>>
>> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
>> index 8dafa1ba8d9f..843481bd507d 100644
>> --- a/mm/memory_hotplug.c
>> +++ b/mm/memory_hotplug.c
>> @@ -374,14 +374,11 @@ static unsigned long find_biggest_section_pfn(int nid, struct zone *zone,
>>  static void shrink_zone_span(struct zone *zone, unsigned long start_pfn,
>>  			     unsigned long end_pfn)
>>  {
>> -	unsigned long zone_start_pfn = zone->zone_start_pfn;
>> -	unsigned long z = zone_end_pfn(zone); /* zone_end_pfn namespace clash */
>> -	unsigned long zone_end_pfn = z;
>>  	unsigned long pfn;
>>  	int nid = zone_to_nid(zone);
> 
> We could also remove the nid, right?
> AFAICS, the nid is only used in find_{smallest/biggest}_section_pfn so we could
> place there as well.


I remember sending a patch on this (which was acked, but not picked up
yet)...


oh, there it is :)

https://lore.kernel.org/linux-mm/20191127174158.28226-1-david@redhat.com/

Thanks!

-- 
Thanks,

David / dhildenb