The patch titled
Subject: make __section_nr() more efficient
has been added to the -mm tree. Its filename is
make-__section_nr-more-efficient.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/make-__section_nr-more-efficient.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/make-__section_nr-more-efficient.patch
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------------------------------------------------------
From: Zhou Chengming <zhouchengming1@xxxxxxxxxx>
Subject: make __section_nr() more efficient
When CONFIG_SPARSEMEM_EXTREME is disabled, __section_nr can get
the section number with a subtraction directly.
Link: http://lkml.kernel.org/r/1468988310-11560-1-git-send-email-zhouchengming1@xxxxxxxxxx
Signed-off-by: Zhou Chengming <zhouchengming1@xxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Hanjun Guo <guohanjun@xxxxxxxxxx>
Cc: Li Bin <huawei.libin@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/sparse.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff -puN mm/sparse.c~make-__section_nr-more-efficient mm/sparse.c
--- a/mm/sparse.c~make-__section_nr-more-efficient
+++ a/mm/sparse.c
@@ -100,11 +100,7 @@ static inline int sparse_index_init(unsi
}
#endif
-/*
- * Although written for the SPARSEMEM_EXTREME case, this happens
- * to also work for the flat array case because
- * NR_SECTION_ROOTS==NR_MEM_SECTIONS.
- */
+#ifdef CONFIG_SPARSEMEM_EXTREME
int __section_nr(struct mem_section* ms)
{
unsigned long root_nr;
@@ -123,6 +119,12 @@ int __section_nr(struct mem_section* ms)
return (root_nr * SECTIONS_PER_ROOT) + (ms - root);
}
+#else
+int __section_nr(struct mem_section* ms)
+{
+ return (int)(ms - mem_section[0]);
+}
+#endif
/*
* During early boot, before section_mem_map is used for an actual
_
Patches currently in -mm which might be from zhouchengming1@xxxxxxxxxx are
make-__section_nr-more-efficient.patch
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