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authorWei Yang <richard.weiyang@gmail.com>2017-05-03 14:53:51 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-03 15:52:09 -0700
commit60a7a88dbb9fc9adcca78a10a3ecf36966b5a45c (patch)
tree67bc60057a09cbe1082c83cbd85ba4b9d9a27f11 /mm/sparse.c
parent822519634142cb66614514ac8ee9221868f764bb (diff)
downloadop-kernel-dev-60a7a88dbb9fc9adcca78a10a3ecf36966b5a45c.zip
op-kernel-dev-60a7a88dbb9fc9adcca78a10a3ecf36966b5a45c.tar.gz
mm/sparse: refine usemap_size() a little
The 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@gmail.com Signed-off-by: Wei Yang <richard.weiyang@gmail.com> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/sparse.c')
-rw-r--r--mm/sparse.c5
1 files changed, 1 insertions, 4 deletions
diff --git a/mm/sparse.c b/mm/sparse.c
index db6bf3c..6903c8f 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -248,10 +248,7 @@ static int __meminit sparse_init_one_section(struct mem_section *ms,
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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