[chrome-os:chromeos-5.4 87/99] kernel/dma/swiotlb.c:796:3: warning: ISO C90 forbids mixed declarations and code

[kernel test robot <lkp@intel.com>]

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tree:   https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-5.4
head:   f48859423bcc5a5dc65f30eb1dd540af19cf5ebe
commit: 90482b41670aad6b7552228721b32566cd8cb75c [87/99] BACKPORT: FROMLIST: swiotlb: Add restricted DMA pool
config: arm-allyesconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git remote add chrome-os https://chromium.googlesource.com/chromiumos/third_party/kernel
        git fetch --no-tags chrome-os chromeos-5.4
        git checkout 90482b41670aad6b7552228721b32566cd8cb75c
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   kernel/dma/swiotlb.c:292:1: warning: no previous prototype for 'swiotlb_late_init_with_default_size' [-Wmissing-prototypes]
     292 | swiotlb_late_init_with_default_size(size_t default_size)
         | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/dma/swiotlb.c: In function 'rmem_swiotlb_device_init':
>> kernel/dma/swiotlb.c:796:3: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
     796 |   unsigned long pfn = PHYS_PFN(rmem->base);
         |   ^~~~~~~~


vim +796 kernel/dma/swiotlb.c

   776	
   777	#ifdef CONFIG_DMA_RESTRICTED_POOL
   778	static int rmem_swiotlb_device_init(struct reserved_mem *rmem,
   779					    struct device *dev)
   780	{
   781		struct swiotlb *swiotlb = rmem->priv;
   782		int ret;
   783	
   784		if (dev->dev_swiotlb)
   785			return -EBUSY;
   786	
   787		/* Since multiple devices can share the same pool, the private data,
   788		 * swiotlb struct, will be initialized by the first device attached
   789		 * to it.
   790		 */
   791		if (!swiotlb) {
   792			swiotlb = kzalloc(sizeof(*swiotlb), GFP_KERNEL);
   793			if (!swiotlb)
   794				return -ENOMEM;
   795	#ifdef CONFIG_ARM
 > 796			unsigned long pfn = PHYS_PFN(rmem->base);
   797	
   798			if (!PageHighMem(pfn_to_page(pfn))) {
   799				ret = -EINVAL;
   800				goto cleanup;
   801			}
   802	#endif /* CONFIG_ARM */
   803	
   804			ret = swiotlb_init_tlb_pool(swiotlb, rmem->base, rmem->size);
   805			if (ret)
   806				goto cleanup;
   807	
   808			rmem->priv = swiotlb;
   809		}
   810	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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