From: Wei Yang <richard.weiyang@xxxxxxxxx>
Subject: mm/sparse.c: pass the __highest_present_section_nr + 1 to alloc_func()
In c4e1be9ec113 ("mm, sparsemem: break out of loops early")
__highest_present_section_nr is introduced to reduce the loop counts for
present section. This is also helpful for usemap and memmap allocation.
This patch uses __highest_present_section_nr + 1 to optimize the loop.
Link: http://lkml.kernel.org/r/20180326081956.75275-1-richard.weiyang@xxxxxxxxx
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/sparse.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/sparse.c~mm-sparse-pass-the-__highest_present_section_nr-1-to-alloc_func mm/sparse.c
--- a/mm/sparse.c~mm-sparse-pass-the-__highest_present_section_nr-1-to-alloc_func
+++ a/mm/sparse.c
@@ -522,7 +522,7 @@ static void __init alloc_usemap_and_memm
map_count = 1;
}
/* ok, last chunk */
- alloc_func(data, pnum_begin, NR_MEM_SECTIONS,
+ alloc_func(data, pnum_begin, __highest_present_section_nr+1,
map_count, nodeid_begin);
}
_
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