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Commit d538c164 authored by Wei Yang's avatar Wei Yang Committed by Linus Torvalds
Browse files

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: default avatarWei Yang <richard.weiyang@gmail.com>
Acked-by: default avatarDavid Rientjes <rientjes@google.com>
Reviewed-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Cc: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 68827280

mm/sparse.c

+1 −3
Original line number Diff line number Diff line
@@ -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))