Commit 08994b24 authored Jun 07, 2018 by Wei Yang Committed by Linus Torvalds Jun 07, 2018

mm/sparse.c: pass the __highest_present_section_nr + 1 to alloc_func()

In commit c4e1be9e ("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@gmail.com


Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: David Rientjes <rientjes@google.com>
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>

parent d538c164

mm/sparse.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -522,7 +522,7 @@ static void __init alloc_usemap_and_memmap(void (*alloc_func)
		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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