From: Wei Yang <richard.weiyang@xxxxxxxxx>
Subject: mm/sparse: refine usemap_size() a little
Current implementation calculates usemap_size in two steps:
* calculate number of bytes to cover these bits
* calculate number of "unsigned long" to cover these bytes
It would be more clear by:
* calculate number of "unsigned long" to cover these bits
* multiple it with sizeof(unsigned long)
This patch refine usemap_size() a little to make it more easy to
understand.
Link: http://lkml.kernel.org/r/20170310043713.96871-1-richard.weiyang@xxxxxxxxx
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/sparse.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff -puN mm/sparse.c~mm-sparse-refine-usemap_size-a-little mm/sparse.c
--- a/mm/sparse.c~mm-sparse-refine-usemap_size-a-little
+++ a/mm/sparse.c
@@ -248,10 +248,7 @@ static int __meminit sparse_init_one_sec
unsigned long usemap_size(void)
{
- unsigned long size_bytes;
- size_bytes = roundup(SECTION_BLOCKFLAGS_BITS, 8) / 8;
- size_bytes = roundup(size_bytes, sizeof(unsigned long));
- return size_bytes;
+ return BITS_TO_LONGS(SECTION_BLOCKFLAGS_BITS) * sizeof(unsigned long);
}
#ifdef CONFIG_MEMORY_HOTPLUG
_
--
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