linux-kernel - [sbates130272-p2pmem:p2pdma_user_cmb_v5 21/23] drivers/pci/p2pdma.c:108:38: sparse: sparse: dereference of noderef expression

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Date:   Tue, 28 Dec 2021 15:53:22 +0800
From:   kernel test robot <lkp@...el.com>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [sbates130272-p2pmem:p2pdma_user_cmb_v5 21/23]
 drivers/pci/p2pdma.c:108:38: sparse: sparse: dereference of noderef
 expression

tree:   https://github.com/sbates130272/linux-p2pmem.git p2pdma_user_cmb_v5
head:   407e0b007d670af84abbb624d9bbd4057b31a7d9
commit: 987aec4824931d2be618b29001359e633aa96988 [21/23] mm: use custom page_free for P2PDMA pages
config: x86_64-randconfig-s021-20211228 (https://download.01.org/0day-ci/archive/20211228/202112281530.kK94gKnk-lkp@intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://github.com/sbates130272/linux-p2pmem/commit/987aec4824931d2be618b29001359e633aa96988
        git remote add sbates130272-p2pmem https://github.com/sbates130272/linux-p2pmem.git
        git fetch --no-tags sbates130272-p2pmem p2pdma_user_cmb_v5
        git checkout 987aec4824931d2be618b29001359e633aa96988
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/pci/

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 >>)
>> drivers/pci/p2pdma.c:108:38: sparse: sparse: dereference of noderef expression
>> drivers/pci/p2pdma.c:108:38: sparse: sparse: dereference of noderef expression

vim +108 drivers/pci/p2pdma.c

   103	
   104	static void p2pdma_page_free(struct page *page)
   105	{
   106		struct pci_p2pdma_pagemap *pgmap = to_p2p_pgmap(page->pgmap);
   107	
 > 108		gen_pool_free(pgmap->provider->p2pdma->pool,
   109			      (uintptr_t)page_to_virt(page), PAGE_SIZE);
   110	}
   111	

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