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mm/sparse.c: check __highest_present_section_nr only for a present section 

When searching a present section, there are two boundaries:

    * __highest_present_section_nr
    * NR_MEM_SECTIONS

And it is known, __highest_present_section_nr is a more strict boundary
than NR_MEM_SECTIONS.  This means it would be necessary to check
__highest_present_section_nr only.

Link: http://lkml.kernel.org/r/20180326081956.75275-2-richard.weiyang@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Acked-by: David Rientjes <rientjes@google.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wei Yang 2018-06-07 17:06:39 -07:00 committed by Linus Torvalds
parent 688272809f
commit d538c164fc
1 changed files with 1 additions and 3 deletions
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4
mm/sparse.c
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@ -190,15 +190,13 @@ static inline int next_present_section_nr(int section_nr)
section_nr++;
if (present_section_nr(section_nr))
return section_nr;
} while ((section_nr < NR_MEM_SECTIONS) &&
(section_nr <= __highest_present_section_nr));
} while ((section_nr <= __highest_present_section_nr));
return -1;
}
#define for_each_present_section_nr(start, section_nr) \
for (section_nr = next_present_section_nr(start-1); \
((section_nr >= 0) && \
(section_nr < NR_MEM_SECTIONS) && \
(section_nr <= __highest_present_section_nr)); \
section_nr = next_present_section_nr(section_nr))