[PATCH 1/5] mm: correct SECTION_SHIFT name in code comments

[Dong Aisheng]

Actually SECTIONS_SHIFT is used in the kernel code, fixed the code
comments. BTW, also moved the code comment to where it's defined.

Also fixed a checkpatch complain derived from the original code:
WARNING: please, no space before tabs
+ * SECTIONS_SHIFT    ^I^I#bits space required to store a section #$

Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Yu Zhao <yuzhao@xxxxxxxxxx>
Cc: Andrey Konovalov <andreyknvl@xxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: Dong Aisheng <aisheng.dong@xxxxxxx>
---
 include/linux/mmzone.h            | 2 --
 include/linux/page-flags-layout.h | 3 +++
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 9cdc88d09f2b..fc23e36cb165 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -1198,8 +1198,6 @@ static inline struct zoneref *first_zones_zonelist(struct zonelist *zonelist,
 #ifdef CONFIG_SPARSEMEM
 
 /*
- * SECTION_SHIFT    		#bits space required to store a section #
- *
  * PA_SECTION_SHIFT		physical address to/from section number
  * PFN_SECTION_SHIFT		pfn to/from section number
  */
diff --git a/include/linux/page-flags-layout.h b/include/linux/page-flags-layout.h
index ef1e3e736e14..aff616855492 100644
--- a/include/linux/page-flags-layout.h
+++ b/include/linux/page-flags-layout.h
@@ -26,6 +26,9 @@
 
 #define ZONES_WIDTH		ZONES_SHIFT
 
+/*
+ * SECTIONS_SHIFT		#bits space required to store a section #
+ */
 #ifdef CONFIG_SPARSEMEM
 #include <asm/sparsemem.h>
 #define SECTIONS_SHIFT	(MAX_PHYSMEM_BITS - SECTION_SIZE_BITS)
-- 
2.25.1