Re: [PATCH v2] cma: check for memory region overlapping

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

Hi Binglei,

kernel test robot noticed the following build errors:

[auto build test ERROR on linus/master]
[also build test ERROR on v6.5-rc3 next-20230725]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Binglei-Wang/cma-check-for-memory-region-overlapping/20230725-222426
base:   linus/master
patch link:    https://lore.kernel.org/r/20230725141602.7759-1-l3b2w1%40gmail.com
patch subject: [PATCH v2] cma: check for memory region overlapping
config: loongarch-allyesconfig (https://download.01.org/0day-ci/archive/20230726/202307260010.zz6hkvQa-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230726/202307260010.zz6hkvQa-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/202307260010.zz6hkvQa-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from include/linux/dma-map-ops.h:9,
                    from kernel/dma/contiguous.c:51:
   include/linux/dma-mapping.h: In function 'rmem_cma_setup':
>> include/linux/dma-mapping.h:336:8: error: unterminated argument list invoking macro "pr_info"
     336 |         return dma_map_page_attrs(dev, virt_to_page(ptr), offset_in_page(ptr),
         | ^       ~~~~~~~~~~~~~~~~~
>> kernel/dma/contiguous.c:414:17: error: 'pr_info' undeclared (first use in this function); did you mean 'qc_info'?
     414 |                 pr_info("Reserved memory: overlap with other memblock reserved region\n",
         |                 ^~~~~~~
         |                 qc_info
   kernel/dma/contiguous.c:414:17: note: each undeclared identifier is reported only once for each function it appears in
>> kernel/dma/contiguous.c:414:24: error: expected ';' at end of input
     414 |                 pr_info("Reserved memory: overlap with other memblock reserved region\n",
         |                        ^
         |                        ;
   ......
>> kernel/dma/contiguous.c:414:17: error: expected declaration or statement at end of input
     414 |                 pr_info("Reserved memory: overlap with other memblock reserved region\n",
         |                 ^~~~~~~
>> kernel/dma/contiguous.c:414:17: error: expected declaration or statement at end of input
   kernel/dma/contiguous.c:405:13: warning: unused variable 'err' [-Wunused-variable]
     405 |         int err;
         |             ^~~
   kernel/dma/contiguous.c:404:21: warning: unused variable 'cma' [-Wunused-variable]
     404 |         struct cma *cma;
         |                     ^~~
   kernel/dma/contiguous.c: At top level:
   kernel/dma/contiguous.c:400:19: warning: 'rmem_cma_setup' defined but not used [-Wunused-function]
     400 | static int __init rmem_cma_setup(struct reserved_mem *rmem)
         |                   ^~~~~~~~~~~~~~
   kernel/dma/contiguous.c:395:38: warning: 'rmem_cma_ops' defined but not used [-Wunused-const-variable=]
     395 | static const struct reserved_mem_ops rmem_cma_ops = {
         |                                      ^~~~~~~~~~~~


vim +/pr_info +336 include/linux/dma-mapping.h

0d71675f87dc40 Christoph Hellwig 2020-09-01  327  
2e05ea5cdc1ac5 Christoph Hellwig 2018-12-25  328  static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,
2e05ea5cdc1ac5 Christoph Hellwig 2018-12-25  329  		size_t size, enum dma_data_direction dir, unsigned long attrs)
2e05ea5cdc1ac5 Christoph Hellwig 2018-12-25  330  {
4544b9f25e70ea Kees Cook         2019-10-29  331  	/* DMA must never operate on areas that might be remapped. */
4544b9f25e70ea Kees Cook         2019-10-29  332  	if (dev_WARN_ONCE(dev, is_vmalloc_addr(ptr),
4544b9f25e70ea Kees Cook         2019-10-29  333  			  "rejecting DMA map of vmalloc memory\n"))
4544b9f25e70ea Kees Cook         2019-10-29  334  		return DMA_MAPPING_ERROR;
2e05ea5cdc1ac5 Christoph Hellwig 2018-12-25  335  	debug_dma_map_single(dev, ptr, size);
2e05ea5cdc1ac5 Christoph Hellwig 2018-12-25 @336  	return dma_map_page_attrs(dev, virt_to_page(ptr), offset_in_page(ptr),
2e05ea5cdc1ac5 Christoph Hellwig 2018-12-25  337  			size, dir, attrs);
2e05ea5cdc1ac5 Christoph Hellwig 2018-12-25  338  }
2e05ea5cdc1ac5 Christoph Hellwig 2018-12-25  339  

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