linux-kernel - Re: [PATCH] RDMA/erdma: Use vcalloc() instead of vzalloc()

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Message-ID: <474093f9-e2da-4803-8839-df33f70622a9@vivo.com>
Date: Thu, 21 Aug 2025 14:44:19 +0800
From: Qianfeng Rong <rongqianfeng@...o.com>
To: Cheng Xu <chengyou@...ux.alibaba.com>,
 Markus Elfring <Markus.Elfring@....de>, linux-rdma@...r.kernel.org
Cc: LKML <linux-kernel@...r.kernel.org>, Jason Gunthorpe <jgg@...pe.ca>,
 Kai Shen <kaishen@...ux.alibaba.com>, Leon Romanovsky <leon@...nel.org>,
 Liao Yuanhong <liaoyuanhong@...o.com>
Subject: Re: [PATCH] RDMA/erdma: Use vcalloc() instead of vzalloc()


在 2025/8/21 14:26, Cheng Xu 写道:
>
> On 8/20/25 10:34 PM, Markus Elfring wrote:
>>> Replace vzalloc() with vcalloc() in vmalloc_to_dma_addrs(). …
>>
>>
>> …
>>> +++ b/drivers/infiniband/hw/erdma/erdma_verbs.c
>>> @@ -671,7 +671,7 @@ static u32 vmalloc_to_dma_addrs(struct erdma_dev *dev, dma_addr_t **dma_addrs,
>>>   
>>>   	npages = (PAGE_ALIGN((u64)buf + len) - PAGE_ALIGN_DOWN((u64)buf)) >>
>>>   		 PAGE_SHIFT;
>>> -	pg_dma = vzalloc(npages * sizeof(dma_addr_t));
>>> +	pg_dma = vcalloc(npages, sizeof(dma_addr_t));
>> …
>>
>> How do you think about to adjust also the size determination?
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/coding-style.rst?h=v6.17-rc2#n944
>>
>> 	pg_dma = vcalloc(npages, sizeof(*pg_dma));
>>
> Hi Qianfeng and Markus,
>
> Both your changes look good to me.
>
> Qianfeng, Could you send v2 including Markus's change?
Ok, I will release v2 with Markus's change later.
>
> Thanks,
> Cheng Xu
>
>> Regards,
>> Markus