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

[kernel test robot]

Hi Vincent,

kernel test robot noticed the following build warnings:

[auto build test WARNING 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-r046-20230728 (https://download.01.org/0day-ci/archive/20230729/202307291143.HTPVZOsb-lkp@xxxxxxxxx/config)
compiler: arm-linux-gnueabi-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230729/202307291143.HTPVZOsb-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/202307291143.HTPVZOsb-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

   In file included from arch/arm/include/asm/page.h:193,
                    from arch/arm/include/asm/thread_info.h:14,
                    from include/linux/thread_info.h:60,
                    from include/asm-generic/preempt.h:5,
                    from ./arch/arm/include/generated/asm/preempt.h:1,
                    from include/linux/preempt.h:79,
                    from include/linux/percpu.h:6,
                    from include/linux/context_tracking_state.h:5,
                    from include/linux/hardirq.h:5,
                    from include/linux/interrupt.h:11,
                    from include/linux/trace_recursion.h:5,
                    from kernel/trace/ring_buffer.c:7:
   kernel/trace/ring_buffer.c: In function 'rb_free_page_ids':
>> kernel/trace/ring_buffer.c:5946:50: warning: passing argument 1 of 'virt_to_pfn' makes pointer from integer without a cast [-Wint-conversion]
    5946 |                 virt_to_page(cpu_buffer->page_ids[i])->mapping = NULL;
         |                              ~~~~~~~~~~~~~~~~~~~~^~~
         |                                                  |
         |                                                  long unsigned int
   include/asm-generic/memory_model.h:18:46: note: in definition of macro '__pfn_to_page'
      18 | #define __pfn_to_page(pfn)      (mem_map + ((pfn) - ARCH_PFN_OFFSET))
         |                                              ^~~
   kernel/trace/ring_buffer.c:5946:17: note: in expansion of macro 'virt_to_page'
    5946 |                 virt_to_page(cpu_buffer->page_ids[i])->mapping = NULL;
         |                 ^~~~~~~~~~~~
   In file included from arch/arm/include/asm/page.h:188:
   arch/arm/include/asm/memory.h:296:53: note: expected 'const void *' but argument is of type 'long unsigned int'
     296 | static inline unsigned long virt_to_pfn(const void *p)
         |                                         ~~~~~~~~~~~~^
   kernel/trace/ring_buffer.c: In function 'rb_free_meta_page':
   kernel/trace/ring_buffer.c:5968:22: warning: passing argument 1 of 'virt_to_pfn' makes pointer from integer without a cast [-Wint-conversion]
    5968 |         virt_to_page(addr)->mapping = NULL;
         |                      ^~~~
         |                      |
         |                      long unsigned int
   include/asm-generic/memory_model.h:18:46: note: in definition of macro '__pfn_to_page'
      18 | #define __pfn_to_page(pfn)      (mem_map + ((pfn) - ARCH_PFN_OFFSET))
         |                                              ^~~
   kernel/trace/ring_buffer.c:5968:9: note: in expansion of macro 'virt_to_page'
    5968 |         virt_to_page(addr)->mapping = NULL;
         |         ^~~~~~~~~~~~
   arch/arm/include/asm/memory.h:296:53: note: expected 'const void *' but argument is of type 'long unsigned int'
     296 | static inline unsigned long virt_to_pfn(const void *p)
         |                                         ~~~~~~~~~~~~^
   kernel/trace/ring_buffer.c: In function 'ring_buffer_map_fault':
   kernel/trace/ring_buffer.c:6156:49: warning: passing argument 1 of 'virt_to_pfn' makes pointer from integer without a cast [-Wint-conversion]
    6156 |         return virt_to_page(cpu_buffer->page_ids[pgoff]);
         |                             ~~~~~~~~~~~~~~~~~~~~^~~~~~~
         |                                                 |
         |                                                 long unsigned int
   include/asm-generic/memory_model.h:18:46: note: in definition of macro '__pfn_to_page'
      18 | #define __pfn_to_page(pfn)      (mem_map + ((pfn) - ARCH_PFN_OFFSET))
         |                                              ^~~
   kernel/trace/ring_buffer.c:6156:16: note: in expansion of macro 'virt_to_page'
    6156 |         return virt_to_page(cpu_buffer->page_ids[pgoff]);
         |                ^~~~~~~~~~~~
   arch/arm/include/asm/memory.h:296:53: note: expected 'const void *' but argument is of type 'long unsigned int'
     296 | static inline unsigned long virt_to_pfn(const void *p)
         |                                         ~~~~~~~~~~~~^


vim +/virt_to_pfn +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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