linux-kernel - include/linux/pgtable.h:257:16: sparse: sparse: cast to non-scalar

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Message-ID: <202203090359.xgOwYxvo-lkp@intel.com>
Date:   Wed, 9 Mar 2022 03:14:32 +0800
From:   kernel test robot <lkp@...el.com>
To:     Huang Ying <ying.huang@...el.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Mel Gorman <mgorman@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: include/linux/pgtable.h:257:16: sparse: sparse: cast to non-scalar

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   ea4424be16887a37735d6550cfd0611528dbe5d9
commit: b99a342d4f11a5455d999b12f5fee42ab6acaf8c NUMA balancing: reduce TLB flush via delaying mapping on hint page fault
date:   10 months ago
config: alpha-randconfig-s031-20220308 (https://download.01.org/0day-ci/archive/20220309/202203090359.xgOwYxvo-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 11.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b99a342d4f11a5455d999b12f5fee42ab6acaf8c
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout b99a342d4f11a5455d999b12f5fee42ab6acaf8c
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=alpha SHELL=/bin/bash

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


sparse warnings: (new ones prefixed by >>)
   mm/memory.c:949:17: sparse: sparse: context imbalance in 'copy_pte_range' - different lock contexts for basic block
   mm/memory.c:1629:16: sparse: sparse: context imbalance in '__get_locked_pte' - different lock contexts for basic block
   mm/memory.c:1678:9: sparse: sparse: context imbalance in 'insert_page' - different lock contexts for basic block
   mm/memory.c:2180:17: sparse: sparse: context imbalance in 'remap_pte_range' - different lock contexts for basic block
   mm/memory.c:2436:17: sparse: sparse: context imbalance in 'apply_to_pte_range' - unexpected unlock
   mm/memory.c:2692:17: sparse: sparse: context imbalance in 'wp_page_copy' - unexpected unlock
   mm/memory.c:3038:17: sparse: sparse: context imbalance in 'wp_pfn_shared' - unexpected unlock
   mm/memory.c:3101:19: sparse: sparse: context imbalance in 'do_wp_page' - different lock contexts for basic block
   mm/memory.c: note: in included file (through include/linux/mm.h, arch/alpha/include/asm/io.h, include/linux/io.h, include/linux/irq.h, ...):
>> include/linux/pgtable.h:257:16: sparse: sparse: cast to non-scalar
>> include/linux/pgtable.h:257:16: sparse: sparse: cast from non-scalar
   mm/memory.c:4660:5: sparse: sparse: context imbalance in 'follow_invalidate_pte' - different lock contexts for basic block
   mm/memory.c:4781:9: sparse: sparse: context imbalance in 'follow_pfn' - unexpected unlock

vim +257 include/linux/pgtable.h

e2cda322648122 include/asm-generic/pgtable.h Andrea Arcangeli 2011-01-13  253  
481e980a7c199c include/linux/pgtable.h       Christophe Leroy 2020-06-15  254  #ifndef __HAVE_ARCH_PTEP_GET
481e980a7c199c include/linux/pgtable.h       Christophe Leroy 2020-06-15  255  static inline pte_t ptep_get(pte_t *ptep)
481e980a7c199c include/linux/pgtable.h       Christophe Leroy 2020-06-15  256  {
481e980a7c199c include/linux/pgtable.h       Christophe Leroy 2020-06-15 @257  	return READ_ONCE(*ptep);
481e980a7c199c include/linux/pgtable.h       Christophe Leroy 2020-06-15  258  }
481e980a7c199c include/linux/pgtable.h       Christophe Leroy 2020-06-15  259  #endif
481e980a7c199c include/linux/pgtable.h       Christophe Leroy 2020-06-15  260  

:::::: The code at line 257 was first introduced by commit
:::::: 481e980a7c199c5a4634fd7ea308067dd4ba75fa mm: Allow arches to provide ptep_get()

:::::: TO: Christophe Leroy <christophe.leroy@...roup.eu>
:::::: CC: Michael Ellerman <mpe@...erman.id.au>

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