linux-kernel - [RESEND PATCH] base/memory: pass the base_section in add_memory

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Message-Id: <20170614054550.14469-1-richard.weiyang@gmail.com>
Date:   Wed, 14 Jun 2017 13:45:50 +0800
From:   Wei Yang <richard.weiyang@...il.com>
To:     gregkh@...uxfoundation.org, mhocko@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Wei Yang <richard.weiyang@...il.com>
Subject: [RESEND PATCH] base/memory: pass the base_section in add_memory_block

Based on Greg's comment, cc it to mm list.
The original thread could be found https://lkml.org/lkml/2017/6/7/202

The second parameter of init_memory_block() is used to calculate the
start_section_nr of this block, which means any section in the same block
would get the same start_section_nr.

This patch passes the base_section to init_memory_block(), so that to
reduce a local variable and a check in every loop.

Signed-off-by: Wei Yang <richard.weiyang@...il.com>
---
 drivers/base/memory.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index cc4f1d0cbffe..1e903aba2aa1 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -664,21 +664,20 @@ static int init_memory_block(struct memory_block **memory,
 static int add_memory_block(int base_section_nr)
 {
 	struct memory_block *mem;
-	int i, ret, section_count = 0, section_nr;
+	int i, ret, section_count = 0;
 
 	for (i = base_section_nr;
 	     (i < base_section_nr + sections_per_block) && i < NR_MEM_SECTIONS;
 	     i++) {
 		if (!present_section_nr(i))
 			continue;
-		if (section_count == 0)
-			section_nr = i;
 		section_count++;
 	}
 
 	if (section_count == 0)
 		return 0;
-	ret = init_memory_block(&mem, __nr_to_section(section_nr), MEM_ONLINE);
+	ret = init_memory_block(&mem, __nr_to_section(base_section_nr),
+				MEM_ONLINE);
 	if (ret)
 		return ret;
 	mem->section_count = section_count;
-- 
2.11.0