[isilence:zc/veth 5/7] io_uring/zc_rx.c:116:20: warning: unused variable 'addr'

[isilence:zc/veth 5/7] io_uring/zc_rx.c:116:20: warning: unused variable 'addr'

[kernel test robot]

tree:   https://github.com/isilence/linux zc/veth
head:   cff8a226d561bc0db814b65ca5d2c97894d4d1cd
commit: 87d67390f5c169ff9ae3ed9748e59e5cfb540d70 [5/7] veth: zc_rx support
config: um-defconfig (https://download.01.org/0day-ci/archive/20231014/202310140601.NUM9TjyM-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231014/202310140601.NUM9TjyM-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202310140601.NUM9TjyM-lkp@intel.com/

All warnings (new ones prefixed by >>):

   io_uring/zc_rx.c: In function 'io_zc_rx_map_buf':
>> io_uring/zc_rx.c:116:20: warning: unused variable 'addr' [-Wunused-variable]
     116 |         dma_addr_t addr;
         |                    ^~~~
   io_uring/zc_rx.c: At top level:
   io_uring/zc_rx.c:185:5: warning: no previous prototype for 'io_zc_rx_create_pool' [-Wmissing-prototypes]
     185 | int io_zc_rx_create_pool(struct io_ring_ctx *ctx,
         |     ^~~~~~~~~~~~~~~~~~~~


vim +/addr +116 io_uring/zc_rx.c

568ae4bf1dd0e1 David Wei      2023-08-14  112  
de471788991400 David Wei      2023-08-11  113  static int io_zc_rx_map_buf(struct device *dev, struct page *page, u16 pool_id,
de471788991400 David Wei      2023-08-11  114  			    u32 pgid, struct io_zc_rx_buf *buf)
de471788991400 David Wei      2023-08-11  115  {
de471788991400 David Wei      2023-08-11 @116  	dma_addr_t addr;
de471788991400 David Wei      2023-08-11  117  
de471788991400 David Wei      2023-08-11  118  	SetPagePrivate(page);
de471788991400 David Wei      2023-08-11  119  	set_page_private(page, mk_page_info(pool_id, pgid));
de471788991400 David Wei      2023-08-11  120  
87d67390f5c169 Pavel Begunkov 2023-10-12  121  	// addr = dma_map_page_attrs(dev, page, 0, PAGE_SIZE,
87d67390f5c169 Pavel Begunkov 2023-10-12  122  	// 			  DMA_BIDIRECTIONAL,
87d67390f5c169 Pavel Begunkov 2023-10-12  123  	// 			  DMA_ATTR_SKIP_CPU_SYNC);
87d67390f5c169 Pavel Begunkov 2023-10-12  124  	// if (dma_mapping_error(dev, addr)) {
87d67390f5c169 Pavel Begunkov 2023-10-12  125  	// 	set_page_private(page, 0);
87d67390f5c169 Pavel Begunkov 2023-10-12  126  	// 	ClearPagePrivate(page);
87d67390f5c169 Pavel Begunkov 2023-10-12  127  	// 	return -ENOMEM;
87d67390f5c169 Pavel Begunkov 2023-10-12  128  	// }
87d67390f5c169 Pavel Begunkov 2023-10-12  129  	buf->dma = 0;
87d67390f5c169 Pavel Begunkov 2023-10-12  130  	// buf->dma = addr;
de471788991400 David Wei      2023-08-11  131  
de471788991400 David Wei      2023-08-11  132  	buf->page = page;
de471788991400 David Wei      2023-08-11  133  	atomic_set(&buf->refcount, 0);
de471788991400 David Wei      2023-08-11  134  	get_page(page);
de471788991400 David Wei      2023-08-11  135  
de471788991400 David Wei      2023-08-11  136  	return 0;
de471788991400 David Wei      2023-08-11  137  }
de471788991400 David Wei      2023-08-11  138  

:::::: The code at line 116 was first introduced by commit
:::::: de471788991400859db2362ac41d6f1d2662820a io_uring: add ZC buf and pool

:::::: TO: David Wei <davidhwei@meta.com>
:::::: CC: David Wei <davidhwei@meta.com>

-- 
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