linux-kernel - [PATCH V2 1/6] mm: drop SECTION

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Date:   Mon, 31 May 2021 17:19:03 +0800
From:   Dong Aisheng <aisheng.dong@....com>
To:     linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org, dongas86@...il.com,
        Dong Aisheng <aisheng.dong@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Yu Zhao <yuzhao@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Kees Cook <keescook@...omium.org>
Subject: [PATCH V2 1/6] mm: drop SECTION_SHIFT in code comments

Actually SECTIONS_SHIFT is used in the kernel code, so the code
comments is strictly incorrect. And since
commit bbeae5b05ef6 ("mm: move page flags layout to separate header"),
SECTIONS_SHIFT definition has been moved to include/linux/page-flags-layout.h,
since code itself looks quite straighforward, instead of moving
the code comment into the new place as well, we just simply remove it.

This 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@...ux-foundation.org>
Cc: Yu Zhao <yuzhao@...gle.com>
Cc: Andrey Konovalov <andreyknvl@...il.com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Kees Cook <keescook@...omium.org>
Suggested-by: Yu Zhao <yuzhao@...gle.com>
Signed-off-by: Dong Aisheng <aisheng.dong@....com>
---
Changelog:
v1->v2:
 * drop the SECTION_SHIFT code comments instead of moving it
---
 include/linux/mmzone.h | 2 --
 1 file changed, 2 deletions(-)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 05cbcddbf432..a6bfde85ddb0 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -1203,8 +1203,6 @@ 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
  */
-- 
2.25.1