Re: [PATCH v5 1/2] ring-buffer: Introducing ring-buffer mapping functions

Re: [PATCH v5 1/2] ring-buffer: Introducing ring-buffer mapping functions

[kernel test robot]

Hi Vincent,

kernel test robot noticed the following build errors:

[auto build test ERROR on linus/master]
[cannot apply to rostedt-trace/for-next rostedt-trace/for-next-urgent]
[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/Vincent-Donnefort/ring-buffer-Introducing-ring-buffer-mapping-functions/20230729-005300
base:   linus/master
patch link:    https://lore.kernel.org/r/20230728164754.460767-2-vdonnefort%40google.com
patch subject: [PATCH v5 1/2] ring-buffer: Introducing ring-buffer mapping functions
config: arm-randconfig-r033-20230728 (https://download.01.org/0day-ci/archive/20230729/202307290828.WNBmhbTA-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce: (https://download.01.org/0day-ci/archive/20230729/202307290828.WNBmhbTA-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/202307290828.WNBmhbTA-lkp@intel.com/

All errors (new ones prefixed by >>):

>> kernel/trace/ring_buffer.c:5946:16: error: incompatible integer to pointer conversion passing 'unsigned long' to parameter of type 'const void *' [-Wint-conversion]
    5946 |                 virt_to_page(cpu_buffer->page_ids[i])->mapping = NULL;
         |                              ^~~~~~~~~~~~~~~~~~~~~~~
   arch/arm/include/asm/memory.h:390:53: note: expanded from macro 'virt_to_page'
     390 | #define virt_to_page(kaddr)     pfn_to_page(virt_to_pfn(kaddr))
         |                                                         ^~~~~
   include/asm-generic/memory_model.h:18:41: note: expanded from macro '__pfn_to_page'
      18 | #define __pfn_to_page(pfn)      (mem_map + ((pfn) - ARCH_PFN_OFFSET))
         |                                              ^~~
   arch/arm/include/asm/memory.h:296:53: note: passing argument to parameter 'p' here
     296 | static inline unsigned long virt_to_pfn(const void *p)
         |                                                     ^
   kernel/trace/ring_buffer.c:5968:15: error: incompatible integer to pointer conversion passing 'unsigned long' to parameter of type 'const void *' [-Wint-conversion]
    5968 |         virt_to_page(addr)->mapping = NULL;
         |                      ^~~~
   arch/arm/include/asm/memory.h:390:53: note: expanded from macro 'virt_to_page'
     390 | #define virt_to_page(kaddr)     pfn_to_page(virt_to_pfn(kaddr))
         |                                                         ^~~~~
   include/asm-generic/memory_model.h:18:41: note: expanded from macro '__pfn_to_page'
      18 | #define __pfn_to_page(pfn)      (mem_map + ((pfn) - ARCH_PFN_OFFSET))
         |                                              ^~~
   arch/arm/include/asm/memory.h:296:53: note: passing argument to parameter 'p' here
     296 | static inline unsigned long virt_to_pfn(const void *p)
         |                                                     ^
   kernel/trace/ring_buffer.c:6156:22: error: incompatible integer to pointer conversion passing 'unsigned long' to parameter of type 'const void *' [-Wint-conversion]
    6156 |         return virt_to_page(cpu_buffer->page_ids[pgoff]);
         |                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/arm/include/asm/memory.h:390:53: note: expanded from macro 'virt_to_page'
     390 | #define virt_to_page(kaddr)     pfn_to_page(virt_to_pfn(kaddr))
         |                                                         ^~~~~
   include/asm-generic/memory_model.h:18:41: note: expanded from macro '__pfn_to_page'
      18 | #define __pfn_to_page(pfn)      (mem_map + ((pfn) - ARCH_PFN_OFFSET))
         |                                              ^~~
   arch/arm/include/asm/memory.h:296:53: note: passing argument to parameter 'p' here
     296 | static inline unsigned long virt_to_pfn(const void *p)
         |                                                     ^
   3 errors generated.


vim +5946 kernel/trace/ring_buffer.c

  5940	
  5941	static void rb_free_page_ids(struct ring_buffer_per_cpu *cpu_buffer)
  5942	{
  5943		int i;
  5944	
  5945		for (i = 0; i < cpu_buffer->nr_pages + 1; i++)
> 5946			virt_to_page(cpu_buffer->page_ids[i])->mapping = NULL;
  5947	
  5948		kfree(cpu_buffer->page_ids);
  5949		cpu_buffer->page_ids = NULL;
  5950	}
  5951	

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