Re: [PATCH net-next] net: page_pool: API cleanup and comments

Hi Ilias,

I love your patch! Yet something to improve:

[auto build test ERROR on v5.6-rc1]
[also build test ERROR on next-20200217]
[cannot apply to net-next/master net/master linus/master ipvs/master v5.6-rc2]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Ilias-Apalodimas/net-page_pool-API-cleanup-and-comments/20200218-163634
base:    bb6d3fb354c5ee8d6bde2d576eb7220ea09862b9
config: i386-randconfig-b002-20200218 (attached as .config)
compiler: gcc-7 (Debian 7.5.0-5) 7.5.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <redacted>

All errors (new ones prefixed by >>):

   ld: net/core/xdp.o: in function `__xdp_release_frame':

quoted

net/core/xdp.c:426: undefined reference to `page_pool_release_page'

vim +426 net/core/xdp.c

05296620f6d14d Jakub Kicinski         2018-07-11  415  
6bf071bf09d4b2 Jesper Dangaard Brouer 2019-06-18  416  /* Only called for MEM_TYPE_PAGE_POOL see xdp.h */
6bf071bf09d4b2 Jesper Dangaard Brouer 2019-06-18  417  void __xdp_release_frame(void *data, struct xdp_mem_info *mem)
6bf071bf09d4b2 Jesper Dangaard Brouer 2019-06-18  418  {
6bf071bf09d4b2 Jesper Dangaard Brouer 2019-06-18  419  	struct xdp_mem_allocator *xa;
6bf071bf09d4b2 Jesper Dangaard Brouer 2019-06-18  420  	struct page *page;
6bf071bf09d4b2 Jesper Dangaard Brouer 2019-06-18  421  
6bf071bf09d4b2 Jesper Dangaard Brouer 2019-06-18  422  	rcu_read_lock();
6bf071bf09d4b2 Jesper Dangaard Brouer 2019-06-18  423  	xa = rhashtable_lookup(mem_id_ht, &mem->id, mem_id_rht_params);
6bf071bf09d4b2 Jesper Dangaard Brouer 2019-06-18  424  	page = virt_to_head_page(data);
6bf071bf09d4b2 Jesper Dangaard Brouer 2019-06-18  425  	if (xa)
6bf071bf09d4b2 Jesper Dangaard Brouer 2019-06-18 @426  		page_pool_release_page(xa->page_pool, page);
6bf071bf09d4b2 Jesper Dangaard Brouer 2019-06-18  427  	rcu_read_unlock();
6bf071bf09d4b2 Jesper Dangaard Brouer 2019-06-18  428  }
6bf071bf09d4b2 Jesper Dangaard Brouer 2019-06-18  429  EXPORT_SYMBOL_GPL(__xdp_release_frame);
6bf071bf09d4b2 Jesper Dangaard Brouer 2019-06-18  430  

:::::: The code at line 426 was first introduced by commit
:::::: 6bf071bf09d4b2ff3ee8783531e2ce814f0870cb xdp: page_pool related fix to cpumap

:::::: TO: Jesper Dangaard Brouer [off-list ref]
:::::: CC: David S. Miller [off-list ref]

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