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

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Message-ID: <202512150712.0PH2z2O5-lkp@intel.com>
Date: Mon, 15 Dec 2025 07:40:14 +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: llvm@...ts.linux.dev, 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-003-20251215 (https://download.01.org/0day-ci/archive/20251215/202512150712.0PH2z2O5-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251215/202512150712.0PH2z2O5-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/202512150712.0PH2z2O5-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/cxl/core/hdm.c:533:25: warning: implicit conversion from 'unsigned long long' to 'resource_size_t' (aka 'unsigned int') changes value from 18446744073709551615 to 4294967295 [-Wconstant-conversion]
     533 |         resource_size_t base = ULLONG_MAX;
         |                         ~~~~   ^~~~~~~~~~
   include/vdso/limits.h:16:21: note: expanded from macro 'ULLONG_MAX'
      16 | #define ULLONG_MAX      (~0ULL)
         |                          ^~~~~
   1 warning generated.


vim +533 drivers/cxl/core/hdm.c

   530	
   531	resource_size_t cxl_dpa_resource_start(struct cxl_endpoint_decoder *cxled)
   532	{
 > 533		resource_size_t base = ULLONG_MAX;
   534	
   535		lockdep_assert_held(&cxl_rwsem.dpa);
   536		if (cxled->dpa_res)
   537			base = cxled->dpa_res->start;
   538	
   539		return base;
   540	}
   541	

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