netdev - Re: [PATCH v3 18/26] page_pool: Allow page_pool_recycle

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Date:   Thu, 12 Jan 2023 09:45:19 +0100
From:   Jesper Dangaard Brouer <jbrouer@...hat.com>
To:     Matthew Wilcox <willy@...radead.org>,
        kernel test robot <lkp@...el.com>
Cc:     brouer@...hat.com, Jesper Dangaard Brouer <hawk@...nel.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
        netdev@...r.kernel.org, linux-mm@...ck.org,
        Shakeel Butt <shakeelb@...gle.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Andy Gospodarek <andrew.gospodarek@...adcom.com>
Subject: Re: [PATCH v3 18/26] page_pool: Allow page_pool_recycle_direct() to
 take a netmem or a page


On 11/01/2023 14.43, Matthew Wilcox wrote:
> On Wed, Jan 11, 2023 at 08:48:30PM +0800, kernel test robot wrote:
>>>> drivers/net/ethernet/broadcom/bnxt/bnxt.c:2978:4: error: controlling expression type 'void *' not compatible with any generic association type
>>                             page_pool_recycle_direct(rxr->page_pool, data);
>>                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> I swear I did an allmodconfig build ... don't know how I missed this
> one.  I think I'll make the page_pool_recycle_direct() macro accept
> void * as well, and treat it as a page.  Once we finish the conversion
> to netmem, this problem will go away.
> 
> ie this:
> 
> +++ b/include/net/page_pool.h
> @@ -485,7 +485,8 @@ static inline void __page_pool_recycle_page_direct(struct page_pool *pool,
>   
>   #define page_pool_recycle_direct(pool, mem)    _Generic((mem),         \
>          struct netmem *: __page_pool_recycle_direct(pool, (struct netmem *)mem),                \
> -       struct page *:   __page_pool_recycle_page_direct(pool, (struct page *)mem))
> +       struct page *:   __page_pool_recycle_page_direct(pool, (struct page *)mem),     \
> +       void *:  __page_pool_recycle_page_direct(pool, (struct page *)mem))
>   

I'm okay with this change, and you can add my acked by.

Acked-by: Jesper Dangaard Brouer <brouer@...hat.com>

Maybe broadcom/bnxt driver should (later) be converted to not use void
pointers... cc. Andy.

--Jesper