linux-kernel - mm/sparse.c:145:2: warning: int result is returned as long value. If the return value is long to avoid loss of information, then you have loss of information. [truncLongCastReturn]

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Message-ID: <202107130348.6LsVT9Nc-lkp@intel.com>
Date:   Tue, 13 Jul 2021 03:19:06 +0800
From:   kernel test robot <lkp@...el.com>
To:     Mike Rapoport <rppt@...ux.ibm.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: mm/sparse.c:145:2: warning: int result is returned as long value. If
 the return value is long to avoid loss of information, then you have loss of
 information. [truncLongCastReturn]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   e73f0f0ee7541171d89f2e2491130c7771ba58d3
commit: 36d40290c8f71daf1ba5567ab14574f36b9b8d6a alpha: switch from DISCONTIGMEM to SPARSEMEM
date:   7 months ago
compiler: alpha-linux-gcc (GCC) 9.3.0

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


cppcheck warnings: (new ones prefixed by >>)
>> mm/sparse.c:145:2: warning: int result is returned as long value. If the return value is long to avoid loss of information, then you have loss of information. [truncLongCastReturn]
    return (nid << SECTION_NID_SHIFT);
    ^

vim +145 mm/sparse.c

4ca644d970bf25 Dave Hansen    2005-10-29  136  
30c253e6da655d Andy Whitcroft 2006-06-23  137  /*
30c253e6da655d Andy Whitcroft 2006-06-23  138   * During early boot, before section_mem_map is used for an actual
30c253e6da655d Andy Whitcroft 2006-06-23  139   * mem_map, we use section_mem_map to store the section's NUMA
30c253e6da655d Andy Whitcroft 2006-06-23  140   * node.  This keeps us from having to use another data structure.  The
30c253e6da655d Andy Whitcroft 2006-06-23  141   * node information is cleared just before we store the real mem_map.
30c253e6da655d Andy Whitcroft 2006-06-23  142   */
30c253e6da655d Andy Whitcroft 2006-06-23  143  static inline unsigned long sparse_encode_early_nid(int nid)
30c253e6da655d Andy Whitcroft 2006-06-23  144  {
30c253e6da655d Andy Whitcroft 2006-06-23 @145  	return (nid << SECTION_NID_SHIFT);
30c253e6da655d Andy Whitcroft 2006-06-23  146  }
30c253e6da655d Andy Whitcroft 2006-06-23  147  

:::::: The code at line 145 was first introduced by commit
:::::: 30c253e6da655d73eb8bfe2adca9b8f4d82fb81e [PATCH] sparsemem: record nid during memory present

:::::: TO: Andy Whitcroft <apw@...dowen.org>
:::::: CC: Linus Torvalds <torvalds@...osdl.org>

---
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