linux-kernel - Re: [PATCH net-next v6 1/6] page_pool: frag API support for 32-bit arch with 64-bit DMA

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Message-ID: <b497faa8-2e57-a060-1105-24ea6bad0051@huawei.com>
Date:   Tue, 15 Aug 2023 20:31:01 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     Simon Horman <horms@...nel.org>
CC:     <davem@...emloft.net>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Alexander Duyck <alexander.duyck@...il.com>,
        Liang Chen <liangchen.linux@...il.com>,
        Alexander Lobakin <aleksander.lobakin@...el.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        <linux-rdma@...r.kernel.org>
Subject: Re: [PATCH net-next v6 1/6] page_pool: frag API support for 32-bit
 arch with 64-bit DMA

On 2023/8/15 19:24, Simon Horman wrote:
> On Mon, Aug 14, 2023 at 08:56:38PM +0800, Yunsheng Lin wrote:
> 
> ...
> 
>> diff --git a/net/core/page_pool.c b/net/core/page_pool.c
>> index 77cb75e63aca..d62c11aaea9a 100644
>> --- a/net/core/page_pool.c
>> +++ b/net/core/page_pool.c
> 
> ...
> 
>> @@ -737,18 +736,16 @@ static void page_pool_free_frag(struct page_pool *pool)
>>  	page_pool_return_page(pool, page);
>>  }
>>  
>> -struct page *page_pool_alloc_frag(struct page_pool *pool,
>> -				  unsigned int *offset,
>> -				  unsigned int size, gfp_t gfp)
>> +struct page *__page_pool_alloc_frag(struct page_pool *pool,
>> +				    unsigned int *offset,
>> +				    unsigned int size, gfp_t gfp)
>>  {
>>  	unsigned int max_size = PAGE_SIZE << pool->p.order;
>>  	struct page *page = pool->frag_page;
>>  
>> -	if (WARN_ON(!(pool->p.flags & PP_FLAG_PAGE_FRAG) ||
>> -		    size > max_size))
>> +	if (WARN_ON(!(pool->p.flags & PP_FLAG_PAGE_FRAG))
> 
> Hi Yunsheng Lin,
> 
> There is a ')' missing on the line above, which results in a build failure.

Yes, thanks for noticing.
As the above checking is removed in patch 3, so it is not noticeable in testing
when the whole patchset is applied.

>