[hch-dma-mapping:for-next 9/10] net/core/page_pool.c:406:47: error: passing 'const struct page *' to parameter of type 'struct page *' discards qualifiers

[hch-dma-mapping:for-next 9/10] net/core/page_pool.c:406:47: error: passing 'const struct page *' to parameter of type 'struct page *' discards qualifiers

[kernel test robot]

tree:   git://git.infradead.org/users/hch/dma-mapping for-next
head:   66772d621cbea3d8acfeda4ba1f411030798d26f
commit: 8bf4d7154d4c0d281666e5595a843be89147d352 [9/10] page_pool: check for DMA sync shortcut earlier
config: riscv-defconfig (https://download.01.org/0day-ci/archive/20240508/202405080101.0mPUjuAp-lkp@intel.com/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project 0ab4458df0688955620b72cc2c72a32dffad3615)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240508/202405080101.0mPUjuAp-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/202405080101.0mPUjuAp-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from net/core/page_pool.c:13:
   In file included from include/net/page_pool/helpers.h:55:
   In file included from include/net/page_pool/types.h:7:
   In file included from include/linux/ptr_ring.h:26:
   In file included from include/linux/mm.h:2210:
   include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     522 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
>> net/core/page_pool.c:406:47: error: passing 'const struct page *' to parameter of type 'struct page *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
     406 |         dma_addr_t dma_addr = page_pool_get_dma_addr(page);
         |                                                      ^~~~
   include/net/page_pool/helpers.h:373:62: note: passing argument to parameter 'page' here
     373 | static inline dma_addr_t page_pool_get_dma_addr(struct page *page)
         |                                                              ^
   1 warning and 1 error generated.


vim +406 net/core/page_pool.c

ff7d6b27f894f1 Jesper Dangaard Brouer  2018-04-17  400  
8bf4d7154d4c0d Alexander Lobakin       2024-05-07  401  static void __page_pool_dma_sync_for_device(const struct page_pool *pool,
8bf4d7154d4c0d Alexander Lobakin       2024-05-07  402  					    const struct page *page,
8bf4d7154d4c0d Alexander Lobakin       2024-05-07  403  					    u32 dma_sync_size)
e68bc75691cc3d Lorenzo Bianconi        2019-11-20  404  {
8bf4d7154d4c0d Alexander Lobakin       2024-05-07  405  #if defined(CONFIG_HAS_DMA) && defined(CONFIG_DMA_NEED_SYNC)
9ddb3c14afba8b Matthew Wilcox (Oracle  2021-05-14 @406) 	dma_addr_t dma_addr = page_pool_get_dma_addr(page);
9ddb3c14afba8b Matthew Wilcox (Oracle  2021-05-14  407) 
e68bc75691cc3d Lorenzo Bianconi        2019-11-20  408  	dma_sync_size = min(dma_sync_size, pool->p.max_len);
8bf4d7154d4c0d Alexander Lobakin       2024-05-07  409  	__dma_sync_single_for_device(pool->p.dev, dma_addr + pool->p.offset,
8bf4d7154d4c0d Alexander Lobakin       2024-05-07  410  				     dma_sync_size, pool->p.dma_dir);
8bf4d7154d4c0d Alexander Lobakin       2024-05-07  411  #endif
8bf4d7154d4c0d Alexander Lobakin       2024-05-07  412  }
8bf4d7154d4c0d Alexander Lobakin       2024-05-07  413  

:::::: The code at line 406 was first introduced by commit
:::::: 9ddb3c14afba8bc5950ed297f02d4ae05ff35cd1 mm: fix struct page layout on 32-bit systems

:::::: TO: Matthew Wilcox (Oracle) <willy@infradead.org>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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