Re: [PATCH 4/7] dma-mapping: Add helpers for dma_range_map bounds

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

Hi Robin,

kernel test robot noticed the following build warnings:

[auto build test WARNING on rafael-pm/linux-next]
[also build test WARNING on rafael-pm/acpi-bus linus/master rafael-pm/devprop v6.7-rc3 next-20231129]
[cannot apply to joro-iommu/next]
[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/Robin-Murphy/OF-Simplify-DMA-range-calculations/20231130-024624
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
patch link:    https://lore.kernel.org/r/b6626985d97ddc33a23b4b9fafa881b35001547e.1701268753.git.robin.murphy%40arm.com
patch subject: [PATCH 4/7] dma-mapping: Add helpers for dma_range_map bounds
config: arm-allnoconfig (https://download.01.org/0day-ci/archive/20231130/202311301330.dGAhHx17-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231130/202311301330.dGAhHx17-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/202311301330.dGAhHx17-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/thread_info.h:12,
                    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/spinlock.h:56,
                    from include/linux/mmzone.h:8,
                    from include/linux/gfp.h:7,
                    from include/linux/mm.h:7,
                    from include/linux/memblock.h:12,
                    from kernel/dma/mapping.c:8:
   include/linux/dma-direct.h: In function 'dma_range_map_min':
>> include/linux/limits.h:25:25: warning: conversion from 'long long unsigned int' to 'dma_addr_t' {aka 'unsigned int'} changes value from '18446744073709551615' to '4294967295' [-Woverflow]
      25 | #define U64_MAX         ((u64)~0ULL)
         |                         ^
   include/linux/dma-direct.h:54:26: note: in expansion of macro 'U64_MAX'
      54 |         dma_addr_t ret = U64_MAX;
         |                          ^~~~~~~


vim +25 include/linux/limits.h

3c9d017cc283df Andy Shevchenko 2023-08-04  14  
54d50897d544c8 Masahiro Yamada 2019-03-07  15  #define U8_MAX		((u8)~0U)
54d50897d544c8 Masahiro Yamada 2019-03-07  16  #define S8_MAX		((s8)(U8_MAX >> 1))
54d50897d544c8 Masahiro Yamada 2019-03-07  17  #define S8_MIN		((s8)(-S8_MAX - 1))
54d50897d544c8 Masahiro Yamada 2019-03-07  18  #define U16_MAX		((u16)~0U)
54d50897d544c8 Masahiro Yamada 2019-03-07  19  #define S16_MAX		((s16)(U16_MAX >> 1))
54d50897d544c8 Masahiro Yamada 2019-03-07  20  #define S16_MIN		((s16)(-S16_MAX - 1))
54d50897d544c8 Masahiro Yamada 2019-03-07  21  #define U32_MAX		((u32)~0U)
3f50f132d8400e John Fastabend  2020-03-30  22  #define U32_MIN		((u32)0)
54d50897d544c8 Masahiro Yamada 2019-03-07  23  #define S32_MAX		((s32)(U32_MAX >> 1))
54d50897d544c8 Masahiro Yamada 2019-03-07  24  #define S32_MIN		((s32)(-S32_MAX - 1))
54d50897d544c8 Masahiro Yamada 2019-03-07 @25  #define U64_MAX		((u64)~0ULL)
54d50897d544c8 Masahiro Yamada 2019-03-07  26  #define S64_MAX		((s64)(U64_MAX >> 1))
54d50897d544c8 Masahiro Yamada 2019-03-07  27  #define S64_MIN		((s64)(-S64_MAX - 1))
54d50897d544c8 Masahiro Yamada 2019-03-07  28  

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