The patch titled
Subject: mm/sparse.c: check __highest_present_section_nr only for a present section
has been added to the -mm tree. Its filename is
mm-sparse-check-__highest_present_section_nr-only-for-a-present-section.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-sparse-check-__highest_present_section_nr-only-for-a-present-section.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-sparse-check-__highest_present_section_nr-only-for-a-present-section.patch
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------------------------------------------------------
From: Wei Yang <richard.weiyang@xxxxxxxxx>
Subject: 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@xxxxxxxxx
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/sparse.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff -puN mm/sparse.c~mm-sparse-check-__highest_present_section_nr-only-for-a-present-section mm/sparse.c
--- a/mm/sparse.c~mm-sparse-check-__highest_present_section_nr-only-for-a-present-section
+++ a/mm/sparse.c
@@ -190,15 +190,13 @@ static inline int next_present_section_n
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))
_
Patches currently in -mm which might be from richard.weiyang@xxxxxxxxx are
mm-page_alloc-remove-realsize-in-free_area_init_core.patch
mm-sparse-check-__highest_present_section_nr-only-for-a-present-section.patch
mm-sparse-pass-the-__highest_present_section_nr-1-to-alloc_func.patch
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