Re: [RFC PATCH 02/21] mm: Allow DMA mapping of pages which are not online

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

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Hi Jonathan,

[FYI, it's a private test report for your RFC patch.]
[auto build test WARNING on net/master]
[also build test WARNING on linus/master v5.8-rc1 next-20200618]
[cannot apply to char-misc/char-misc-testing net-next/master]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use  as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Jonathan-Lemon/netgpu-networking-between-NIC-and-GPU-CPU/20200619-001526
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git ef7232da6bcd4294cbb2d424bc35885721570f01
config: i386-allyesconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-13) 9.3.0
reproduce (this is a W=1 build):
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

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 >>, old ones prefixed by <<):

In file included from arch/x86/include/asm/bug.h:86,
from include/linux/bug.h:5,
from include/linux/thread_info.h:12,
from arch/x86/include/asm/preempt.h:7,
from include/linux/preempt.h:78,
from include/linux/spinlock.h:51,
from include/linux/seqlock.h:36,
from include/linux/time.h:6,
from include/linux/efi.h:17,
from drivers/firmware/efi/libstub/x86-stub.c:9:
include/linux/dma-mapping.h: In function 'dma_map_resource':
>> include/linux/dma-mapping.h:352:19: warning: implicit declaration of function 'pfn_online'; did you mean 'cpu_online'? [-Wimplicit-function-declaration]
352 |  if (WARN_ON_ONCE(pfn_online(PHYS_PFN(phys_addr))))
|                   ^~~~~~~~~~
include/asm-generic/bug.h:101:25: note: in definition of macro 'WARN_ON_ONCE'
101 |  int __ret_warn_on = !!(condition);            |                         ^~~~~~~~~

vim +352 include/linux/dma-mapping.h

   339	
   340	static inline dma_addr_t dma_map_resource(struct device *dev,
   341						  phys_addr_t phys_addr,
   342						  size_t size,
   343						  enum dma_data_direction dir,
   344						  unsigned long attrs)
   345	{
   346		const struct dma_map_ops *ops = get_dma_ops(dev);
   347		dma_addr_t addr = DMA_MAPPING_ERROR;
   348	
   349		BUG_ON(!valid_dma_direction(dir));
   350	
   351		/* Don't allow online RAM to be mapped */
 > 352		if (WARN_ON_ONCE(pfn_online(PHYS_PFN(phys_addr))))
   353			return DMA_MAPPING_ERROR;
   354	
   355		if (dma_is_direct(ops))
   356			addr = dma_direct_map_resource(dev, phys_addr, size, dir, attrs);
   357		else if (ops->map_resource)
   358			addr = ops->map_resource(dev, phys_addr, size, dir, attrs);
   359	
   360		debug_dma_map_resource(dev, phys_addr, size, dir, addr);
   361		return addr;
   362	}
   363	

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

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