linux-kernel - include/linux/minmax.h:93:30: warning: large integer implicitly truncated to unsigned type

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Message-ID: <202503201231.VrUIFcq2-lkp@intel.com>
Date: Thu, 20 Mar 2025 12:16:57 +0800
From: kernel test robot <lkp@...el.com>
To: Huang Ying <ying.huang@...el.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Memory Management List <linux-mm@...ck.org>
Subject: include/linux/minmax.h:93:30: warning: large integer implicitly
 truncated to unsigned type

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   a7f2e10ecd8f18b83951b0bab47ddaf48f93bf47
commit: 99185c10d5d9214d0d0c8b7866660203e344ee3b resource, kunit: add test case for region_intersects()
date:   6 months ago
config: arm-randconfig-r063-20250320 (https://download.01.org/0day-ci/archive/20250320/202503201231.VrUIFcq2-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250320/202503201231.VrUIFcq2-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202503201231.VrUIFcq2-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/ioport.h:15:0,
                    from kernel/resource.c:15:
   kernel/resource.c: In function 'gfr_start':
>> include/linux/minmax.h:93:30: warning: large integer implicitly truncated to unsigned type [-Woverflow]
     ({ type ux = (x); type uy = (y); __cmp(op, ux, uy); })
                                 ^
   include/linux/minmax.h:96:2: note: in expansion of macro '__cmp_once_unique'
     __cmp_once_unique(op, type, x, y, __UNIQUE_ID(x_), __UNIQUE_ID(y_))
     ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:213:27: note: in expansion of macro '__cmp_once'
    #define min_t(type, x, y) __cmp_once(min, type, x, y)
                              ^~~~~~~~~~
   kernel/resource.c:1838:9: note: in expansion of macro 'min_t'
      end = min_t(resource_size_t, base->end, MAX_PHYS_ADDR);
            ^~~~~
   kernel/resource.c: In function 'gfr_continue':
>> include/linux/minmax.h:93:30: warning: large integer implicitly truncated to unsigned type [-Woverflow]
     ({ type ux = (x); type uy = (y); __cmp(op, ux, uy); })
                                 ^
   include/linux/minmax.h:96:2: note: in expansion of macro '__cmp_once_unique'
     __cmp_once_unique(op, type, x, y, __UNIQUE_ID(x_), __UNIQUE_ID(y_))
     ^~~~~~~~~~~~~~~~~
   include/linux/minmax.h:213:27: note: in expansion of macro '__cmp_once'
    #define min_t(type, x, y) __cmp_once(min, type, x, y)
                              ^~~~~~~~~~
   kernel/resource.c:1855:11: note: in expansion of macro 'min_t'
      addr <= min_t(resource_size_t, base->end, MAX_PHYS_ADDR);
              ^~~~~


vim +93 include/linux/minmax.h

d03eba99f5bf7c David Laight   2023-09-18  91  
017fa3e8918784 Linus Torvalds 2024-07-28  92  #define __cmp_once_unique(op, type, x, y, ux, uy) \
017fa3e8918784 Linus Torvalds 2024-07-28 @93  	({ type ux = (x); type uy = (y); __cmp(op, ux, uy); })
017fa3e8918784 Linus Torvalds 2024-07-28  94  

:::::: The code at line 93 was first introduced by commit
:::::: 017fa3e89187848fd056af757769c9e66ac3e93d minmax: simplify and clarify min_t()/max_t() implementation

:::::: TO: Linus Torvalds <torvalds@...ux-foundation.org>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki