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

[kernel test robot]

Hi Binglei,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING 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: i386-allyesconfig (https://download.01.org/0day-ci/archive/20230726/202307260509.OMkcRpqC-lkp@xxxxxxxxx/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce: (https://download.01.org/0day-ci/archive/20230726/202307260509.OMkcRpqC-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202307260509.OMkcRpqC-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

   In file included from include/linux/elf.h:6,
                    from include/linux/module.h:19,
                    from include/linux/device/driver.h:21,
                    from include/linux/device.h:32,
                    from include/linux/dma-mapping.h:8,
                    from include/linux/dma-map-ops.h:9,
                    from kernel/dma/contiguous.c:51:
   arch/x86/include/asm/elf.h: In function 'rmem_cma_setup':
   arch/x86/include/asm/elf.h:204:29: error: unterminated argument list invoking macro "pr_info"
     204 |         (pr_reg)[11] = (regs)->cx;                              \
         |                             ^
   kernel/dma/contiguous.c:414:17: error: 'pr_info' undeclared (first use in this function); did you mean 'pv_info'?
     414 |                 pr_info("Reserved memory: overlap with other memblock reserved region\n",
         |                 ^~~~~~~
         |                 pv_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 +/err +405 kernel/dma/contiguous.c

de9e14eebf33a6 drivers/base/dma-contiguous.c Marek Szyprowski       2014-10-13  394  
de9e14eebf33a6 drivers/base/dma-contiguous.c Marek Szyprowski       2014-10-13 @395  static const struct reserved_mem_ops rmem_cma_ops = {
de9e14eebf33a6 drivers/base/dma-contiguous.c Marek Szyprowski       2014-10-13  396  	.device_init	= rmem_cma_device_init,
de9e14eebf33a6 drivers/base/dma-contiguous.c Marek Szyprowski       2014-10-13  397  	.device_release = rmem_cma_device_release,
de9e14eebf33a6 drivers/base/dma-contiguous.c Marek Szyprowski       2014-10-13  398  };
de9e14eebf33a6 drivers/base/dma-contiguous.c Marek Szyprowski       2014-10-13  399  
de9e14eebf33a6 drivers/base/dma-contiguous.c Marek Szyprowski       2014-10-13 @400  static int __init rmem_cma_setup(struct reserved_mem *rmem)
de9e14eebf33a6 drivers/base/dma-contiguous.c Marek Szyprowski       2014-10-13  401  {
de9e14eebf33a6 drivers/base/dma-contiguous.c Marek Szyprowski       2014-10-13  402  	unsigned long node = rmem->fdt_node;
8c8c5a4994a306 kernel/dma/contiguous.c       Nicolas Saenz Julienne 2020-01-10  403  	bool default_cma = of_get_flat_dt_prop(node, "linux,cma-default", NULL);
de9e14eebf33a6 drivers/base/dma-contiguous.c Marek Szyprowski       2014-10-13 @404  	struct cma *cma;
de9e14eebf33a6 drivers/base/dma-contiguous.c Marek Szyprowski       2014-10-13 @405  	int err;

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