linux-kernel - [morse:mpam/snapshot/v5.16 88/137] include/linux/cacheinfo.h:114:24: warning: conversion from 'long long unsigned int' to 'long unsigned int' changes value from '18446744073709551615' to '4294967295'

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Date:   Wed, 26 Jan 2022 03:28:18 +0800
From:   kernel test robot <lkp@...el.com>
To:     Rob Herring <robh@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        James Morse <james.morse@....com>
Subject: [morse:mpam/snapshot/v5.16 88/137] include/linux/cacheinfo.h:114:24:
 warning: conversion from 'long long unsigned int' to 'long unsigned int'
 changes value from '18446744073709551615' to '4294967295'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git mpam/snapshot/v5.16
head:   364c1c42b229912132e1615c2ce15be7154e2156
commit: 626a68b7eb02b0a0bb7faaa4b91371c2f3d550d0 [88/137] cacheinfo: Allow for >32-bit cache 'id'
config: arc-randconfig-r043-20220124 (https://download.01.org/0day-ci/archive/20220126/202201260308.f359R4GZ-lkp@intel.com/config)
compiler: arc-elf-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git/commit/?id=626a68b7eb02b0a0bb7faaa4b91371c2f3d550d0
        git remote add morse https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git
        git fetch --no-tags morse mpam/snapshot/v5.16
        git checkout 626a68b7eb02b0a0bb7faaa4b91371c2f3d550d0
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arc SHELL=/bin/bash drivers/base/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   In file included from drivers/base/cacheinfo.c:12:
   include/linux/cacheinfo.h: In function 'get_cpu_cacheinfo_id':
>> include/linux/cacheinfo.h:114:24: warning: conversion from 'long long unsigned int' to 'long unsigned int' changes value from '18446744073709551615' to '4294967295' [-Woverflow]
     114 |                 return ~0ULL;
         |                        ^
   include/linux/cacheinfo.h:120:32: warning: conversion from 'long long unsigned int' to 'long unsigned int' changes value from '18446744073709551615' to '4294967295' [-Woverflow]
     120 |                         return ~0ULL;
         |                                ^
   include/linux/cacheinfo.h:124:16: warning: conversion from 'long long unsigned int' to 'long unsigned int' changes value from '18446744073709551615' to '4294967295' [-Woverflow]
     124 |         return ~0ULL;
         |                ^


vim +114 include/linux/cacheinfo.h

   103	
   104	/*
   105	 * Get the id of the cache associated with @cpu at level @level.
   106	 * cpuhp lock must be held.
   107	 */
   108	static inline unsigned long get_cpu_cacheinfo_id(int cpu, int level)
   109	{
   110		struct cpu_cacheinfo *ci = get_cpu_cacheinfo(cpu);
   111		int i;
   112	
   113		if (!ci->info_list)
 > 114			return ~0ULL;
   115	
   116		for (i = 0; i < ci->num_leaves; i++) {
   117			if (ci->info_list[i].level == level) {
   118				if (ci->info_list[i].attributes & CACHE_ID)
   119					return ci->info_list[i].id;
   120				return ~0ULL;
   121			}
   122		}
   123	
   124		return ~0ULL;
   125	}
   126	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org