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include/linux/mmzone.h: avoid a warning in sparse memory support 

cppcheck warns that we're possibly losing information by shifting an int.
It's a false positive, because we don't allow for a NUMA node ID that
large, but if we ever change SECTION_NID_SHIFT, it could become a problem,
and in any case this is usually a legitimate warning.  Fix it by adding
the necessary cast, which makes the compiler generate the right code.

Link: https://lkml.kernel.org/r/YOya+aBZFFmC476e@casper.infradead.org
Link: https://lkml.kernel.org/r/202107130348.6LsVT9Nc-lkp@intel.com
Cc: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox 2021-09-02 14:57:10 -07:00 committed by Linus Torvalds
parent 01c8d337d1
commit e0dbb2bccf
1 changed files with 1 additions and 1 deletions
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2
mm/sparse.c
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@ -117,7 +117,7 @@ static inline int sparse_index_init(unsigned long section_nr, int nid)
*/
static inline unsigned long sparse_encode_early_nid(int nid)
{
return (nid << SECTION_NID_SHIFT);
return ((unsigned long)nid << SECTION_NID_SHIFT);
}
static inline int sparse_early_nid(struct mem_section *section)