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

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Date:   Wed, 11 Jan 2023 13:43:47 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     kernel test robot <lkp@...el.com>
Cc:     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>
Subject: Re: [PATCH v3 18/26] page_pool: Allow page_pool_recycle_direct() to
 take a netmem or a page

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))
 
 #define PAGE_POOL_DMA_USE_PP_FRAG_COUNT        \
                (sizeof(dma_addr_t) > sizeof(unsigned long))