linux-kernel - [stable:linux-4.19.y 2814/3442] include/linux/nodemask.h:380:20: error: comparison of unsigned expression in '>= 0' is always true

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Message-ID: <202208112328.09GkLSzy-lkp@intel.com>
Date:   Thu, 11 Aug 2022 23:34:49 +0800
From:   kernel test robot <lkp@...el.com>
To:     Christophe de Dinechin <dinechin@...hat.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: [stable:linux-4.19.y 2814/3442] include/linux/nodemask.h:380:20:
 error: comparison of unsigned expression in '>= 0' is always true

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-4.19.y
head:   5c7ccbe1aade74e854fb7f9fa001dc1110a0030e
commit: 8d8681d07fc82557d09d9cdc177f9ed529d9a4d8 [2814/3442] nodemask.h: fix compilation error with GCC12
config: alpha-randconfig-r001-20220811 (https://download.01.org/0day-ci/archive/20220811/202208112328.09GkLSzy-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 12.1.0
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/stable/linux-stable.git/commit/?id=8d8681d07fc82557d09d9cdc177f9ed529d9a4d8
        git remote add stable https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
        git fetch --no-tags stable linux-4.19.y
        git checkout 8d8681d07fc82557d09d9cdc177f9ed529d9a4d8
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=alpha SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   In file included from include/linux/mmzone.h:17,
                    from include/linux/gfp.h:6,
                    from include/linux/mm.h:10,
                    from arch/alpha/mm/numa.c:12:
   arch/alpha/mm/numa.c: In function 'paging_init':
>> include/linux/nodemask.h:380:20: error: comparison of unsigned expression in '>= 0' is always true [-Werror=type-limits]
     380 |              (node >= 0) && (node) < MAX_NUMNODES;                  \
         |                    ^~
   include/linux/nodemask.h:433:9: note: in expansion of macro 'for_each_node_mask'
     433 |         for_each_node_mask((__node), node_states[__state])
         |         ^~~~~~~~~~~~~~~~~~
   include/linux/nodemask.h:513:36: note: in expansion of macro 'for_each_node_state'
     513 | #define for_each_online_node(node) for_each_node_state(node, N_ONLINE)
         |                                    ^~~~~~~~~~~~~~~~~~~
   arch/alpha/mm/numa.c:305:9: note: in expansion of macro 'for_each_online_node'
     305 |         for_each_online_node(nid) {
         |         ^~~~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors


vim +380 include/linux/nodemask.h

   376	
   377	#if MAX_NUMNODES > 1
   378	#define for_each_node_mask(node, mask)				    \
   379		for ((node) = first_node(mask);				    \
 > 380		     (node >= 0) && (node) < MAX_NUMNODES;		    \
   381		     (node) = next_node((node), (mask)))
   382	#else /* MAX_NUMNODES == 1 */
   383	#define for_each_node_mask(node, mask)                                  \
   384		for ((node) = 0; (node) < 1 && !nodes_empty(mask); (node)++)
   385	#endif /* MAX_NUMNODES */
   386	

-- 
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