linux-kernel - Re: [PATCH 1/3] mm/percpu: Remove some local variables in pcpu_populate

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Date:   Fri, 28 Jul 2023 09:13:33 +0800
From:   bibo mao <maobibo@...ngson.cn>
To:     Dennis Zhou <dennis@...nel.org>,
        Huacai Chen <chenhuacai@...nel.org>
Cc:     Tejun Heo <tj@...nel.org>, Christoph Lameter <cl@...ux.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, WANG Xuerui <kernel@...0n.name>
Subject: Re: [PATCH 1/3] mm/percpu: Remove some local variables in
 pcpu_populate_pte



在 2023/7/28 07:08, Dennis Zhou 写道:
> Hello,
> 
> On Wed, Jul 12, 2023 at 11:16:20AM +0800, Bibo Mao wrote:
>> In function pcpu_populate_pte there are already variable defined,
>> it can be reused for later use, here remove duplicated local
>> variables.
>>
>> Signed-off-by: Bibo Mao <maobibo@...ngson.cn>
>> ---
>>  mm/percpu.c | 24 +++++++++---------------
>>  1 file changed, 9 insertions(+), 15 deletions(-)
>>
>> diff --git a/mm/percpu.c b/mm/percpu.c
>> index 28e07ede46f6..85e3f9b2a61f 100644
>> --- a/mm/percpu.c
>> +++ b/mm/percpu.c
>> @@ -3189,32 +3189,26 @@ void __init __weak pcpu_populate_pte(unsigned long addr)
>>  	pmd_t *pmd;
>>  
>>  	if (pgd_none(*pgd)) {
>> -		p4d_t *new;
>> -
>> -		new = memblock_alloc(P4D_TABLE_SIZE, P4D_TABLE_SIZE);
>> -		if (!new)
>> +		p4d = memblock_alloc(P4D_TABLE_SIZE, P4D_TABLE_SIZE);
>> +		if (!p4d)
>>  			goto err_alloc;
>> -		pgd_populate(&init_mm, pgd, new);
>> +		pgd_populate(&init_mm, pgd, p4d);
>>  	}
>>  
>>  	p4d = p4d_offset(pgd, addr);
>>  	if (p4d_none(*p4d)) {
>> -		pud_t *new;
>> -
>> -		new = memblock_alloc(PUD_TABLE_SIZE, PUD_TABLE_SIZE);
>> -		if (!new)
>> +		pud = memblock_alloc(PUD_TABLE_SIZE, PUD_TABLE_SIZE);
>> +		if (!pud)
>>  			goto err_alloc;
>> -		p4d_populate(&init_mm, p4d, new);
>> +		p4d_populate(&init_mm, p4d, pud);
>>  	}
>>  
>>  	pud = pud_offset(p4d, addr);
>>  	if (pud_none(*pud)) {
>> -		pmd_t *new;
>> -
>> -		new = memblock_alloc(PMD_TABLE_SIZE, PMD_TABLE_SIZE);
>> -		if (!new)
>> +		pmd = memblock_alloc(PMD_TABLE_SIZE, PMD_TABLE_SIZE);
>> +		if (!pmd)
>>  			goto err_alloc;
>> -		pud_populate(&init_mm, pud, new);
>> +		pud_populate(&init_mm, pud, pmd);
>>  	}
>>  
>>  	pmd = pmd_offset(pud, addr);
>> -- 
>> 2.27.0
>>
> 
> I've pulled this, but the other 2 are part of loongarch and should be
> reviewed and pulled by those maintainers.
Dennis,

Thanks for your feedback.

Huacai,

Could you give some review comments about the remaining 2 patches?

Regards
Bibo Mao

> 
> Thanks,
> Dennis