linux-kernel - Re: [PATCH v8 12/13] cxl: Check if ULLONG_MAX was returned from translation functions

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Message-ID: <202512120346.aT9GKk20-lkp@intel.com>
Date: Fri, 12 Dec 2025 03:50:22 +0800
From: kernel test robot <lkp@...el.com>
To: Robert Richter <rrichter@....com>,
	Alison Schofield <alison.schofield@...el.com>,
	Vishal Verma <vishal.l.verma@...el.com>,
	Ira Weiny <ira.weiny@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Jonathan Cameron <jonathan.cameron@...wei.com>,
	Dave Jiang <dave.jiang@...el.com>,
	Davidlohr Bueso <dave@...olabs.net>
Cc: oe-kbuild-all@...ts.linux.dev, linux-cxl@...r.kernel.org,
	linux-kernel@...r.kernel.org, Gregory Price <gourry@...rry.net>,
	"Fabio M. De Francesco" <fabio.m.de.francesco@...ux.intel.com>,
	Terry Bowman <terry.bowman@....com>,
	Joshua Hahn <joshua.hahnjy@...il.com>,
	Robert Richter <rrichter@....com>
Subject: Re: [PATCH v8 12/13] cxl: Check if ULLONG_MAX was returned from
 translation functions

Hi Robert,

kernel test robot noticed the following build warnings:

[auto build test WARNING on ea5514e300568cbe8f19431c3e424d4791db8291]

url:    https://github.com/intel-lab-lkp/linux/commits/Robert-Richter/cxl-region-Rename-misleading-variable-name-hpa-to-hpa_range/20251210-021858
base:   ea5514e300568cbe8f19431c3e424d4791db8291
patch link:    https://lore.kernel.org/r/20251209180659.208842-13-rrichter%40amd.com
patch subject: [PATCH v8 12/13] cxl: Check if ULLONG_MAX was returned from translation functions
config: i386-randconfig-141-20251212 (https://download.01.org/0day-ci/archive/20251212/202512120346.aT9GKk20-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.4.0-5) 12.4.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251212/202512120346.aT9GKk20-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/202512120346.aT9GKk20-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/limits.h:7,
                    from include/linux/overflow.h:6,
                    from include/linux/string.h:13,
                    from include/linux/seq_file.h:6,
                    from drivers/cxl/core/hdm.c:3:
   drivers/cxl/core/hdm.c: In function 'cxl_dpa_resource_start':
>> include/vdso/limits.h:16:25: warning: conversion from 'long long unsigned int' to 'resource_size_t' {aka 'unsigned int'} changes value from '18446744073709551615' to '4294967295' [-Woverflow]
      16 | #define ULLONG_MAX      (~0ULL)
         |                         ^
   drivers/cxl/core/hdm.c:533:32: note: in expansion of macro 'ULLONG_MAX'
     533 |         resource_size_t base = ULLONG_MAX;
         |                                ^~~~~~~~~~


vim +16 include/vdso/limits.h

3e0e9f8c6e3ca9 Vincenzo Frascino 2020-03-20   4  
3e0e9f8c6e3ca9 Vincenzo Frascino 2020-03-20   5  #define USHRT_MAX	((unsigned short)~0U)
3e0e9f8c6e3ca9 Vincenzo Frascino 2020-03-20   6  #define SHRT_MAX	((short)(USHRT_MAX >> 1))
3e0e9f8c6e3ca9 Vincenzo Frascino 2020-03-20   7  #define SHRT_MIN	((short)(-SHRT_MAX - 1))
3e0e9f8c6e3ca9 Vincenzo Frascino 2020-03-20   8  #define INT_MAX		((int)(~0U >> 1))
3e0e9f8c6e3ca9 Vincenzo Frascino 2020-03-20   9  #define INT_MIN		(-INT_MAX - 1)
3e0e9f8c6e3ca9 Vincenzo Frascino 2020-03-20  10  #define UINT_MAX	(~0U)
3e0e9f8c6e3ca9 Vincenzo Frascino 2020-03-20  11  #define LONG_MAX	((long)(~0UL >> 1))
3e0e9f8c6e3ca9 Vincenzo Frascino 2020-03-20  12  #define LONG_MIN	(-LONG_MAX - 1)
3e0e9f8c6e3ca9 Vincenzo Frascino 2020-03-20  13  #define ULONG_MAX	(~0UL)
3e0e9f8c6e3ca9 Vincenzo Frascino 2020-03-20  14  #define LLONG_MAX	((long long)(~0ULL >> 1))
3e0e9f8c6e3ca9 Vincenzo Frascino 2020-03-20  15  #define LLONG_MIN	(-LLONG_MAX - 1)
3e0e9f8c6e3ca9 Vincenzo Frascino 2020-03-20 @16  #define ULLONG_MAX	(~0ULL)
3e0e9f8c6e3ca9 Vincenzo Frascino 2020-03-20  17  #define UINTPTR_MAX	ULONG_MAX
3e0e9f8c6e3ca9 Vincenzo Frascino 2020-03-20  18  

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